Polyurethane is called polyurethane.
It is a main chain containing repeated carbamate groups.
High molecular compound. It is formed by addition polymerization of organic diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds. In addition to carbamates, polyurethane macromolecules
Can also contain ether, ester, urea and biuret.
And allophanate groups. Structure of polyurethane
According to the different raw materials used, there can be different products, generally polyester and polyether. It can be used to make plastics, rubber, fibers, rigid and flexible foams, adhesives and coatings.
What material is polyurethane?
Polyurethane is called polyurethane, which is the general name of macromolecular compounds with repeated carbamate groups in the main chain. It is formed by addition polymerization of organic diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds.
Polyurethane can be divided into polyester type and polyether type. They can be made into polyurethane plastics, polyurethane fibers, polyurethane rubber and elastomers. Flexible polyurethane mainly has thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foam, and has less compression deformation. Good heat insulation, sound insulation, earthquake resistance and anti-virus performance.
The role of polyurethane:
Polyurethane can be used to make plastics, rubber, fibers, rigid and flexible foams, adhesives and coatings. , and can be used in all fields of people's lives, with a very wide range of applications.
1. Polyurethane foam: it can be divided into rigid polyurethane foam, semi-rigid polyurethane foam and flexible polyurethane foam. Rigid polyurethane foam is mainly used for building thermal insulation materials, thermal insulation materials and daily necessities.
2. Polyurethane elastomer: Polyurethane elastomer has good tensile strength, tear strength, impact resistance, wear resistance, weather resistance, hydrolysis resistance and oil resistance. Mainly used as coating materials, insulators, soles and solid tires.
3. Polyurethane waterproof material: Polyurethane waterproof material is very convenient to use. It can be mixed and coated on site, cured at normal temperature and humidity, and a seamless waterproof layer with rubber elasticity and good performance can be obtained. And is easy to repair after being damaged. Generally used as floor material, track material, racecourse and park floor material, heat insulation window frame, etc.
Baidu encyclopedia-polyurethane
What is polyurethane?
Polyurethane is a new type of organic polymer material, known as "the fifth largest plastic", and is widely used in many fields of national economy because of its excellent properties. The product application fields involve light industry, chemical industry, electronics, textiles, medical treatment, architecture, building materials, automobiles, national defense, aerospace and aviation. ....
General advantages of polyurethane materials:
Wide hardness range
Under the same hardness, it has higher bearing capacity than other elastomers.
High wear resistance and impact resistance
The rebound is large
Suitable for high frequency flexure applications
Good low temperature flexibility
Special formula, stable at 140℃
Moisture and vapor transfer-suitable for microporous materials
Not affected by ozone erosion
radioresistance
Can be made into flame retardant materials.
antifungal
High friction and low friction
Can be processed on standard equipment.
Can be bonded with wood, metal and most plastics.
Can be made into noise reduction materials.
Low molding and processing costs.
Widely resistant to oil, grease and chemicals.
The total cost is economical.
What is polyurethane?
Polyurethane, the full name of which is polyurethane, is a polymer compound. It was made by Otto Bayer at 1937. Polyurethane can be divided into polyester type and polyether type. It can be made into polyurethane plastics, mainly foam plastics and polyurethane fibers, which are called spandex, polyurethane rubber and elastomer in China.
Flexible polyurethane mainly has thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foam, and has less compression deformation. Good heat insulation, sound insulation, earthquake resistance and anti-virus performance. Therefore, it is used as packaging, sound insulation and filtering materials. Rigid polyurethane plastic has the advantages of light weight, excellent sound and heat insulation, good chemical resistance, good electrical properties, easy processing and low water absorption.
It is mainly used as structural materials for building, automobile, aviation industry and thermal insulation. The performance of polyurethane elastomer is between plastic and rubber, with oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness and elasticity. Mainly used in footwear industry and medical industry. Polyurethane can also be used to make adhesives, coatings, synthetic leather and so on.
What exactly is polyurethane?
Polyurethane is: the full name is polyurethane, which is a polymer compound. Polyurethane can be divided into polyester type and polyether type. They can be made into polyurethane plastics, polyurethane fibers, polyurethane rubber and elastomers.
The main raw materials of polyurethane are diphenylmethane diisocyanate, toluene diisocyanate and polypropylene glycol, which have become international commodities at present. The production technology and equipment of these raw materials are very complicated, and the product competition is fierce. Due to long-term development, production is relatively concentrated.
Isocyanate is a general term for all kinds of isocyanates. If classified according to the number of-NCO groups, it includes monoisocyanate R-N = C = O, diisocyanate O = C = N-R-N = C = O and polyisocyanate. It can also be divided into aliphatic isocyanate and aromatic isocyanate. At present, aromatic isocyanates, such as MDI and TDI, are used the most.
Application:
1, clothing and sporting goods
Polyurethane is widely used in clothing industry. Its representative products are comfortable, soft, elastic and elastic high-elastic fibers and leather products. In addition to women's underwear and socks, its amazing extensibility is fully exerted in ski shirts and swimsuits.
2. necessities of life
At home, the use of polyurethane products has created a comfortable living environment for us. Polyurethane paint has a beautiful gloss on the surface of furniture, piano and other musical instruments, which plays a solid protective role. Soft foam is widely used as cushion material and healthy bedding to disperse the pressure brought to human body.
In the kitchen, rigid foam is used as heat insulation material for refrigerators and so on, and polyurethane resin with good adhesion to plastic films is used as adhesive for food packaging.
3. Electronic products
Promoting the development of electronic industry is the mission of polyurethane. Polyurethane adhesive has excellent wear resistance and adhesion, and is used as magnetic adhesive for various recording media such as audio tapes, video tapes, computer disks, rechargeable cards and electronic tickets, which improves the recording density.
Baidu encyclopedia-polyurethane
What material is polyurethane?
1. Polyurethane, the full name of which is polyurethane, is a polymer compound. It was made by Otto Bayer at 1937. Polyurethane can be divided into polyester type and polyether type. They can be made into polyurethane plastics, polyurethane fibers, polyurethane rubber and elastomers.
2. Flexible polyurethane has a thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foam, and has less compression deformation. Good heat insulation, sound insulation, earthquake resistance and anti-virus performance. Therefore, it is used as packaging, sound insulation and filtering materials. Rigid polyurethane plastic has the advantages of light weight, excellent sound and heat insulation, good chemical resistance, good electrical properties, easy processing and low water absorption. It is mainly used as structural materials for building, automobile, aviation industry and thermal insulation. The performance of polyurethane elastomer is between plastic and rubber.