Spraying Quick-Curing Rubber Asphalt Waterproof Coatings ",standard plan number: 20 1 1-0596T-JC. This standard was written by China.
China Building Materials Inspection and Certification Group Suzhou Co., Ltd., Suzhou Sinoma Nonmetallic Mineral Industry Design and Research Institute Research Co., Ltd.
Building Waterproofing Association and Technical Supervision and Research Center of Building Materials Industry are responsible for organizing relevant production enterprises, quality inspection institutions and scientific research.
This standard was drafted by the Institute and other relevant units. It has been submitted for approval. This paper introduces the product performance, domestic and international situation and production situation involved in this standard.
This paper introduces the principles, reasons, purposes and main contents of product application and standard formulation for readers' reference.
1 background of standard formulation
1. 1 product composition and performance
The quick-setting rubber asphalt waterproof coating consists of a component A of rubber asphalt emulsion and a component B of demulsifier, wherein the component A consists of
Anionic emulsified asphalt with high solid content is composed of anionic neoprene latex, styrene-butadiene latex and other polymers, which are modified by mixing.
Water-based polymer. The component A and the component B are mixed on site by special spraying equipment, and then quickly demulsified and solidified to form dense matter.
Continuous and complete, with extremely high elongation, super elasticity, excellent durability, waterproof, anticorrosion, seepage prevention and protection.
Effective coating. The product can be applied on wet base surface, with fast curing speed and gel time less than 10 second, and can be sprayed at one time.
Brush to a thickness of more than 2mm, with fast construction speed and environmental protection. This product has the following characteristics:
1) Ultra-high elasticity: the elongation at break of the coating film can reach more than 1000%, which is suitable for expansion joints and deformation joints and can be effective.
Solve the problems of leakage and corrosion caused by stress deformation, expansion cracking, puncture or weak connection of various structures; have
Affect structural deformation and ensure waterproof effect.
2) Overall waterproofing: the coating film can perfectly cover the base layer, realize the seamless connection of the coating, and achieve the purpose that the coiled material is difficult to achieve.
No water channeling, no peeling. It is more convenient and reliable for foundation construction with special-shaped structure or complex shape.
3) Strong puncture resistance: the network structure formed by rubber in the coating is compact and has ultra-high elongation, so it has good performance.
Puncture resistance, suitable for vulnerable parts.
4) Self-sealing and self-healing: high elasticity and high elongation make the coating have self-healing function, and it can also self-heal for general puncture.
Repair, there will be no water leakage.
5) Excellent chemical resistance and temperature resistance: The coating has excellent chemical resistance, acid resistance, alkali resistance, salt resistance and chlorine resistance.
Excellent high and low temperature resistance.
6) Mechanized construction: it is formed instantly after mechanical spraying, and professional spraying machinery is adopted for construction, which greatly saves construction cost and labor.
Power can greatly shorten the construction period.
7) Flexible and diverse construction methods: besides spraying, painting methods such as brushing and scraping can also be adopted.
, to meet the special requirements of water outlet, Yin and Yang angle, construction joints, structural cracks and other waterproof projects. .
8) It can be constructed on wet surface: it can be constructed on wet base surface without open water, which is convenient for subway, tunnel and water.
And other engineering fields.
9) Water-based environmental protection and energy saving: As a new generation of energy-saving and environment-friendly water-based materials, in the process of production, construction and use,
No use of organic solvent, low-temperature freezing spray, non-toxic, tasteless, no waste gas emission, no pollution. In the whole construction process, there is no need to add
Hot work, normal temperature construction, no open flame, to ensure safe and reliable construction.
1.2 Current situation at home and abroad
1) Foreign situation:
Spraying quick-setting rubber asphalt waterproof coating is called liquid rubber abroad, which was invented by American radium company in 1993, and then
This technology has been popularized all over the world. With the importance of environmental protection of waterproof materials in the international market, the convenience of construction,
The requirements for the effectiveness of waterproofing are getting higher and higher, and the products meet the mainstream trend of the global waterproofing market in the future, so at present, such products
Products are being widely promoted and applied in North America, Europe, Russia and the Middle East. Now the United States, Canada,
This product is produced and applied in Russia, Israel, Belgium, South Korea, Thailand and the Middle East. Jet rapid solidification
As the main auxiliary waterproof material, rubber asphalt waterproof coating has thousands of tons every year in the United States and Canada.
Application amount.
2) Domestic situation:
This technology was first introduced from Canada by Tianjin Bolier Technology Development Company in 2007.
In 2008, Ningbo Radium Coating Technology Co., Ltd. and Daewoo Ye Wei (Beijing) International Technology Co., Ltd. imported radium from the United States respectively.
And imported products from South Korea; In 2009, Ningbo Xinling Waterproof Material Co., Ltd. and Dalian Meichente Environmental Protection and Energy Saving Products Co., Ltd.
The department began to develop and produce original products; Subsequently, many waterproof manufacturers were optimistic about the product and began to enter the field. at present
There are Shenyang Guo Jian Cai Jing, Beijing Zhong Fang Ye Wei, Shandong North Innovation, Henan Tiandi Waterproofing, Beijing Oriental Yuhong, Guangdong.
Companies such as Keshun, Tangshan Desheng and Tianjin Yuhong have achieved large-scale production and sales.
1.3 market application
In recent three years, with the gradual maturity of products, technology and construction technology, many domestic enterprises are preparing for this stage.
Production and sales of related products. The domestic waterproof market is huge, and the annual total capacity of the waterproof market is about 654.38+000 billion yuan.
Compared with traditional materials, this product has a unique competitive advantage, so as long as the quick-setting rubber asphalt waterproof coating is sprayed,
The China market has achieved rapid growth. According to incomplete statistics, the national sales volume of liquid rubber products in 20 1 1 year is about 3500 tons.
; 20 12 is expected to be 6000-7000 tons; 20 13 is estimated to be about 10000 tons. Its average annual growth rate reaches 50%-80%, and
The annual growth rate of the overall waterproof market is about 1 1%, and the annual growth rate of waterproof coatings in 20 12 years is 18.5%, which is much higher than that of general waterproof coatings.
The growth rate of water material fully reflects the vitality of spraying quick-setting rubber asphalt waterproof coating in waterproof market.
The market application scale of spraying quick-setting rubber asphalt waterproof coating is also expanding year by year, and the application fields are also expanding year by year:
From a single underground side wall, floor, common roof waterproof, tunnel, landscape lake waterproof maintenance and other projects, and gradually move towards scale.
The mold is suitable for newly-built large-scale municipal projects, such as landfill leachate storage tanks, sewage treatment tanks, subway tunnels, etc.
Waterproofing and other projects, high-speed railway station House and other major projects related to the national economy and people's livelihood, as well as the prevention of color steel roofs, planting roofs and garages.
Water conservancy project.
At present, the main subdivision of spraying quick-setting rubber asphalt waterproof coating is the foundation of underground buildings.
Waterproofing (underground garage, subway, basement, underground passage) and roof waterproofing (roof, balcony, parapet, green roof)
Belt), highway pavement waterproof, railway pavement waterproof, subway waterproof (tunnel, platform, etc. ), tunnel waterproof and seepage control (iron
Waterproof and steel structure of roads, bridges, highway tunnels and culverts), water treatment plants (reservoirs, sewage pools, underground landfills).
Roof waterproofing and corrosion protection (color steel plate, tin roof), artificial lake, water conservancy facilities (canals, reservoirs, etc.). ) and so on.
2 reasons and purposes of standard preparation
Spraying quick-setting rubber asphalt waterproof coating is a product imported from abroad at the beginning of this century, and now domestic enterprises are also developing and producing it.
In addition, some imported products are sold in China. Before, some of the standards realized by products were enterprise standards, and some were based on JC/T408.
The standard of water emulsion asphalt waterproof coating can not fully reflect the characteristics of the product, and the product name is not uniform, which is not conducive to
User adoption. The production technology threshold of this product is relatively low. At present, the number of domestic production enterprises is gradually increasing, and some of them were originally engaged in public affairs.
Enterprises that produce emulsified asphalt have also turned to the waterproof market, but because there is no relevant standard, the product quality is quite different.
Affect the promotion and use of products.
3 Standard scope and classification
The content of standard formulation is first of all the product range, and the standard is applicable to two-component spraying quick-setting rubber suitable for waterproof engineering.
Asphalt emulsion waterproof coating. The usual product form is: emulsion type, mechanical spraying, and the main component is rubber asphalt.
The principle of membrane is chemical demulsification and rapid coagulation. At present, many enterprises have applied for related patents in product formula, spraying equipment and so on. The products specified in this standard are the same as JC/T408 and JC/.
T975 waterproof coatings for roads and bridges are different. First, it is used for rapid solidification in the form of mechanical spraying, followed by more advanced rubber.
Rubber content, with more rubber characteristics. In terms of product classification, it is considered inappropriate to divide products into different models according to performance, because
Position yourself as a high-performance waterproof coating, and avoid vicious competition in the market, which will affect the product image and
Use effect.
4 test items and technical requirements
The setting of the standard project of spraying quick-setting rubber asphalt waterproof coating is first of all the characteristics of the product itself and the satisfaction of the product
Engineering application performance.
4. 1 appearance
It is mainly a component of emulsion. After long-term storage, latex and asphalt emulsion should be layered and mixed evenly after stirring.
In addition, there should be no demulsification, such as gel and agglomeration. In addition, the asphalt emulsion should be emulsified well, and there should be no unemulsified drainage.
Moss.
4.2 solid content of component a
The solid content of this standard product is mainly aimed at rubber asphalt emulsion with component A, and its component B is usually packed in solid state.
When used, it is soluble in water, so the solid content is only component A. As a water-based coating, the higher the solid content, the higher the transportation cost.
The lower, but considering the feasibility and cost of the production process, the solid content should be controlled at an appropriate level to verify the test.
Results The index of (55 ~ 60)% was set at 55%.
4.3 Gel Time
As a quick-setting material, it is also necessary to consider its gel time, which is convenient for irregular and vertical construction and reduces the surface smoothness.
It should be noted that gel time is a widely used term, but the specific testing methods are quite different.
The results of the same method are completely different, and the index of using this standard test method is set to not exceed 5s.
4.4 Working hours
As a film-forming performance, it is hoped that the shorter the product takes, the better, so as to facilitate the construction of the next process, and the index test is carried out according to the verification.
Inspection and reference to relevant paint standards, no more than 24 hours.
4.5 heat resistance
The heat resistance of asphalt-based materials is generally not high, which affects the use. However, for the quick-setting rubber asphalt coating, its latex contains
Large quantity, good heat resistance, set as 120℃ according to the verification test index.
4.6 Watertightness
Watertightness is a commonly used index as waterproof material, but for spraying quick-setting rubber asphalt waterproof coating,
Because it is applied to the front water surface and the back water surface, it has high impermeability, and the standard stipulates that it is 0.3 MPa and impermeable for 30 min.
Actually, it's ok, but for the sake of embodiment, the waterproof material is still kept.
4.7 Bond strength
It reflects the adhesion between the coating and the base layer, and can prevent water channeling, especially for quick-setting materials, because it permeates the surface.
The permeability is low, so the bond strength index is very important. For some occasions where high bonding strength is needed, emulsion can be used.
According to the verification test results, the initiation method is 0.40MPa. For wet base, materials can also be used as base.
When the humidity is not high, the bond strength may be relatively improved, which is equivalent to wetting the base.
4.8 Elastic recovery rate
As an important characteristic of rubber material, it is elastic recovery rate. The higher the latex content, the better the elastic recovery rate.
The verification test index is set to 85%.
4.9 Self-healing of nail rod
Rubber asphalt coatings can heal automatically after being punctured by nails, which is different from other asphalt coatings.
The verification test requires no water seepage.
4. 10 water absorption
As a waterproof material, high water absorption will affect its waterproof effect. This index is based on verification test and reference to related coatings.
Standard setting, no more than 2.0%.
4. 1 1 low temperature flexibility
It reflects the deformability and characteristics of materials at low temperature, and the influencing factors are the quality and content of latex and asphalt.
Brittle point and wax content are set at -20℃.
4. 12 tensile properties
Tensile property is an important characteristic of rapidly solidified materials, which has excellent elongation and can resist the deformation of the base.
At the same time, it has high strength and can resist high water pressure and sharp instrument puncture. The higher the latex content, the higher its strength and elongation.
Well, considering the engineering application, the strength requirement is not less than 0.80MPa, and the elongation is at least 1000%, because the elongation index is certain.
Too high means little. In addition, the durability of the material needs to be considered. Due to the high ductility of spraying rapid solidification, alkali treatment and acid treatment are difficult.
After mechanical treatment, salt treatment, heat treatment and ultraviolet treatment, the tensile strength of the sample is not significant, so only materials are studied.
Elongation index at break.
4. 13 limit of harmful substances
As a declared environmental protection material, it should at least meet the requirements of Class B of JC 1066-2008 waterborne coatings.
5 standard requirements
5. 1 General requirements
The production and application of products should not have harmful effects on human body, biology and environment, which involves production and use.
Customs safety and environmental protection requirements shall conform to the provisions of relevant national standards and norms in China.
5.2 Technical requirements
5.2. 1 Appearance
The rubber asphalt emulsion component (component A) has uniform color, no gel, no caking and no filiform after stirring. demulsification
Agent (component B) does not agglomerate, but can form a uniform liquid after being dissolved in water.
Physical and mechanical properties
The physical and mechanical properties of the products shall conform to the provisions in Table 1.
Table 1 physical and mechanical properties
5.3 Limit of harmful substances
The content of harmful substances in the product should meet the requirements of JC 1066-2008 B water-based waterproof coating.
6 test method
The standard test method is GB/T 16777-2008 Test Method for Waterproof Coatings for Buildings.
In the verification test, the preparation of coating film has great influence on the final performance, mainly the effect of two-component spraying and atomization of spray gun.
The uniformity and partial overlap of the two components in the air affect the fineness of coated particles. Try spraying first,
Observe the appearance of the coating, and then formally form a film. The coating can be prepared by the manufacturer or sprayed in the laboratory.
Preparation of coating equipment, coating film should be sprayed to the specified thickness at one time.
According to the investigation and study at home and abroad, the standard drafting group conducted verification tests on the collected domestic and foreign standards, mainly including
According to the standard test items, test methods and indicators, * * * collected 1 1 samples from relevant production enterprises, including
Two samples from foreign companies.
(1) appearance
After stirring, visually inspect component A and component B. ..
(2) Solid content (component A)
After the sample of component A is evenly stirred, take (6 1) g sample and pour it into a dried and weighed Petri dish with a diameter of (65 5) mm.
Scrape it flat, weigh it immediately, and then put it into (105 2)℃
(3) Gel time
Under standard test conditions, add about 50mL demulsifier (component B) into 200mL beaker, and then add rubber asphalt emulsion.
Add about 10 ml of liquid (component a) and stir thoroughly. Record the time when the emulsion is added until it does not flow, which is the gel time.
(4) Actual working hours
Take the aluminum plate whose surface has been cleaned with solvent, and spray the sample on the aluminum plate according to the proportion required by the manufacturer.
The product is 100mm×50mm, the dosage is 2.5kg/m2, and then the aluminum plate is placed at a 45-degree angle. According to GB/T16777-200816.2.
.2 The test shall be carried out according to the specified requirements without adhesion.
(5) Heat resistance
Taking an aluminum plate whose surface has been cleaned with a solvent, uniformly stirring the component A, and then coating it for 3-5 times (with an interval of 4-8 hours),
Or spray the sample on the aluminum plate according to the proportion required by the manufacturer, with the coating area of 100mm×50mm and the total thickness of (1.5 0.2).
) mm, scraping the surface for the last time, curing under standard test conditions 120h, and then curing at (40 2)℃.
Cured in a drying oven for 48 hours. Taking out the test piece, vertically hanging the aluminum plate in an electric hair dryer drying box which has been adjusted to a specified temperature,
The distance between the sample and the wall of the drying oven is not less than 50mm, and it is taken out after standing for 5 hours to observe the surface phenomenon. * * * Test three samples.
After the test, all samples should not flow, slide or drip.
(6) impermeability
Cut the test pieces that meet the requirements in Table 2, and conduct the test according to chapter 15 of GB/T 16777-2008, between the metal mesh and the coating film.
Add a filter paper to prevent sticking.
(7) Bond strength
Drying the base surface: the test was carried out according to the method 7. 1 A in GB/T 16777-2008. Specimens are prepared by spraying on the substrate with spraying equipment.
The total thickness of dry film on wood surface should be controlled at (0.5 ~1.0) mm.
Wet base: completely immerse the mortar block of method 7. 1 A in GB/t12008 in water for 24h and take it out with a wet towel.
Dry the shiny water on the surface. Then the test is carried out according to the method of drying the base surface. .
(8) Elastic recovery rate
Draw two parallel marks with a distance of 25mm in the middle of the specimen, then stretch the specimen by 500% and keep it in this state for 65438±0h h.
Then, the sample was taken down and placed on a smooth surface covered with talcum powder, and left for 24 hours under standard test conditions, and then measured.
The distance between markers. .
(9) Watertightness of nail rod
Under the standard test conditions, the specimen should be lightly placed on the plywood with a thickness of not less than10mm and the same size as the specimen.
. Nail a wingless galvanized nail with a length of (30 4) mm and a diameter of (1.8 ~ 2.0) mm into plywood from the surface of the coated film and nail it into two pieces.
Nail, located near the center of the specimen, the distance between nails is (25 ~ 50) mm, nail the nail into the nail cap and coat it with a film.
The surface is flat, then tap the nail head from behind and lift the nail out.
Place a circular tube with a diameter of (150 ~ 250) mm and a height of not less than 150mm in the center of the horizontally placed sample surface.
After that, it is sealed on the coating film along the outer circle with sealant, and sealed along the inner circle at the same time, and then cured under standard test conditions.
24 hours.
Put it on a pot with a similar diameter and no cover, then add distilled water to the round tube above, and the water level is.
(130 3) mm, and then moved to (4 2)℃
Take it out and observe that there is no water mark on the bottom of the jar and splint below. Pour out the water in the round tube and dry it, and take out the test piece.
Observe that there is no water mark on the back of the sample. No trace of water was observed in the two samples, and it was considered that there was no water seepage after the test.
The test procedure is the same as JC/T 1068. .
(10) water absorption
Put the test pieces meeting the requirements in Table 2 under standard test conditions for 24h, weigh them immediately (m 1), and then immerse them in (23 2).
)℃ Take the test piece out of the water until the weighing is completed.
Should be completed within 1 minute.
(1 1) Low temperature flexibility
According to GB/T 16777-2008, the diameter of the round bar is (1 01) mm.
Heat treatment, alkali treatment, acid treatment and ultraviolet treatment are carried out under the conditions specified in GB/T 16777 standard, and salt
Treatment: immerse the specimen in 10% sodium chloride solution.
Tensile properties of (12)
The tensile strength of untreated steel is tested according to GB/T 528, and the spacing between clamps is about 50mm, which is (500 50) mm/min.
Stretch the sample at a certain speed until it breaks, and record the distance between marks (L 1) when the sample breaks, accurate to 1 mm ... If the sample is very narrow,
For the external fracture of the part, the test data will be discarded, and the average value of five samples will be taken as the test result.
During the test, if the elongation of the sample reaches 1200% and it is still not broken, the type 2 test conforming to GB/T 528 should be re-cut.
According to the test of GB/T 528, the spacing between fixtures is about 40mm, and the distance between marks is 20mm, with a speed of (500 50) mm/min.
Pull the sample at a certain speed to break it, and record the maximum force.
If the elongation at break of individual specimens reaches 1200%, it shall be calculated as 1200%. If all specimens reach 1200,
% is not broken, and the test result is reported to be greater than 1200%.
Heat treatment, alkali treatment, acid treatment and ultraviolet treatment are carried out under the conditions specified in GB/T 16777 standard.
Salt treatment: immerse the sample in 10% sodium chloride solution. The tensile properties were tested by untreated test methods.
(13) limit of harmful substances
Waterborne waterproof coating according to JC 1066-2008.
7 inspection rules
The ex-factory inspection items include: appearance, solid content, gel time, working time, heat resistance, impermeability and adhesion.
Bonding strength (dry basis), low temperature flexibility (untreated) and tensile properties (untreated).
Type inspection items include all contents in Chapter 5 of this standard.
The size of the inspection lot mainly depends on the production scale of the enterprise and the stability of product quality. The greater the output of an enterprise, the greater the output.
Product quality is stable, and larger batch can be specified; On the other hand, if the enterprise's output is small and the product quality is unstable, the batch will be small.
Some; So the risk is small. This standard is based on the current production scale, actual output and product quality stability.
Degree, the provisions of the same variety and model of products for a batch of 20t, less than a batch can also be counted as a batch.
8 conclusion
The formulation of the industry standard "Spraying Quick-setting Rubber Asphalt Waterproof Coatings" unified the product name and standardized the technical performance.
Indicators, determine a unified inspection method, so that production, design, construction, quality inspection and other departments have rules to follow, production enterprises.
The quality of products is comparable, which provides a basis for rectifying the waterproof market.
The biggest feature of this standard is that it is closely related to the practical application of products, and the technical indicators are determined for future revision and prevention.
The Technical Specification for Hydraulic Engineering provides very effective scientific data, which will certainly promote the spraying of quick-setting rubber asphalt waterproof coatings in China.
Further rapid development. In China, spraying quick-setting rubber asphalt waterproof coating is a kind developed at the beginning of the twentieth century.
New waterproof materials, this industry standard is formulated for the first time in China and needs to be summarized in the process of standard implementation.
Experience, found insufficient, should be revised and improved at the appropriate time.