Formulation of accelerator and retarder for magnesite products

We suggest adding professional GX series magnesite modifier, which can achieve the most ideal control of halogen return and frosting of magnesite products, improve product water resistance and control moisture absorption deformation. Among them, GX- 1# is a high-temperature retarder in summer (the temperature is above 15℃), and its addition amount is about five thousandths of the weight of magnesium oxide, while GX-0# is a low-temperature accelerator in winter (the temperature is-15℃), and its addition amount is about seven thousandths of the weight of magnesium oxide. The specific dosage depends on the air temperature and the active content of magnesium oxide.

What are the formulations of magnesite modifier, accelerator and retarder?

(quoted from kaiyuan magnesite science and technology forum: /sdkyjc/blog)

1, tri (poly) sodium polyphosphate (powder)1.5 kg; ; ?

2. Ferrous sulfate (powder): 1Kg?

3. Tributyl phosphate (powder) 1Kg?

4.NNO diffuser (powder, chemical name: sodium methylene naphthalene sulfonate NaO3SCH2) 1.5Kg?

5. Sodium nitrite (powder) 1Kg?

6. Sodium dodecyl benzene sulfonate (powder) 1.5Kg?

7. Triethanolamine (solvent) 1.5? Kg？

8. Alum (powder) 1Kg?

Second, the preparation method?

1, first use 1-8 to match 2? 0? Kilogram of hot water melts, and then 9? 0? Kilograms of water dissolved. ?

2. Every 1? .0? Add 0.05 kg (50 g) modifier to the prepared magnesite powder?

3. The best proportion of halogen powder is 25-28 degrees. ?

4. The ratio of water-soluble halogen powder to magnesite powder is 0.8-0.9, and magnesite powder 1.0. ?

This formula coincides with many raw materials in the formula 1, such as sodium tripolyphosphate, ferrous sulfate, sodium alkylbenzene sulfonate, triethanolamine, alum and so on. This formula appeared relatively late, and it is said that it was made by a magnesite manufacturer in Fujian. It may also be inspired by Formula One. Sodium tripolyphosphate, NNO dispersing agent (sodium methylene naphthalene sulfonate) and sodium dodecyl benzene sulfonate are commonly used surfactants in chemical industry, and their action principles can be referred to the article "Application of surfactants in magnesite modifier". Ferrous sulfate and alum are commonly used waterproofing agents for Portland cement. The principle of action is that ferrous ions in ferrous sulfate and aluminum ions in alum (potassium aluminum sulfate dodecahydrate) can generate ferrous hydroxide and aluminum hydroxide gel under alkaline conditions, which can block the gaps between crystals to some extent. Tributyl phosphate has certain defoaming effect. Triethanolamine is a common early strength agent in concrete, which has an early strength effect. Sodium nitrite is a common color developer. ?

Theoretically, this formula is feasible. But compared with professional decorators, there is still a big gap. For example, the three small molecular surfactants used in the formula have small molecular weight and limited effect, and sodium dodecyl benzene sulfonate has strong air-entraining effect, so the product is easy to produce bubbles. Although ferrous sulfate and alum have certain effects (only a small part of them), impurity ions-sulfate ion and potassium ion are introduced at the same time. These impurity ions are not conducive to controlling back halogen and product deformation (see the author's article "Causes and Countermeasures of Deformation of Magnesite Products" for details). ?

The anti-halogen agent made according to this formula has low anti-halogen efficiency. Every 1? .0? 0.05 kg (50 g) of modifier is added to the prepared magnesite powder per kg, that is, the dosage is 5% of the magnesium powder. Strictly speaking, this dosage cannot be called magnesite modifier. Because the country has issued the corresponding technical standard: the dosage must be less than 2%, which has obvious influence on the setting time, strength and halogen return of magnesite material, so it can be called modifier. Specializing in the production of magnesite modifier, which is a mixture of various chemical raw materials, is polymerized in a reactor at a certain temperature, pH value and time, and most of them are high molecular weight polymers. Instead of simply mixing various simple chemical small materials. It has the advantages of high efficiency (small dosage, within 65438 0%) and no introduction of impurity ions in the process of controlling back halogen. ?

At present, many magnesite manufacturers, referring to some information and some old patents, have made a lot of small ingredients by themselves. Practice has proved that the cost of these formulas is not low, but the effect is very limited. It is suggested to use more magnesite modifiers produced by some professional manufacturers. ?

GX-Ⅲ series magnesia modifier is a composite modifier. After using GX-Ⅲ series magnesite modifier, there is no need to add other simple chemical raw materials such as ferric chloride, ferrous sulfate, tributyl phosphate, sodium tripolyphosphate, phosphate, styrene-acrylic emulsion and resin.