What are the dilution solvents for organotin catalysts?

2021-11-23   Pageview:304

There are many kinds of solvents for diluting organotin catalysts, including esters, ketones, benzene, etc. The common ones are polyether, ethyl acetate, ethylene glycol, diethylene glycol, or PPG mixed with T9 in a certain ratio. Laboratories generally use DPG for dilution.

 

 

 

 

 

 

 

 

 

 

 

 

 

Today, when aluminum hydroxide has been widely used as a flame retardant, relatively speaking, the development of magnesium hydroxide is indeed a big step late. Magnesium hydroxide and aluminum hydroxide also have the advantages of smokeless, non-toxic, non-corrosive, safe and cheap, and the temperature at which magnesium hydroxide starts to release water is higher than aluminum hydroxide. Magnesium hydroxide is mainly used in fire-retardant coatings. The role of sun burning agent, foaming agent and smoke suppressant, under the action of fire and high temperature, will not decompose into gaseous compounds and burn out. With its stability, paraffin emulsion yarn it can play a role of long-lasting flame resistance, so that the fire-retardant coating has high efficiency. Thermal insulation and fire resistance.

(4) Ammonium dihydrogen phosphate Ammonium dihydrogen phosphate (MAP), also known as monoammonium phosphate, has the molecular formula NH yH gPO;, the relative molecular mass is 115.03. Monoammonium phosphate is a colorless transparent powder or white powder with a relative density (dl) of 1.803. It is easily soluble in water, and its solubility in water increases with the rise of temperature. It is slightly soluble in alcohol and insoluble in acetone.

Ammonium dihydrogen phosphate is stable in the air. It melts at 190°C and separates ammonia and water to form a mixture of ammonium metaphosphate (NH(PO)) and phosphoric acid. A small part of it decomposes at about 100°C. The aqueous solution is alkaline. Ammonium is used in the fire-retardant liquid used in the surface fire-retardant technology treatment of flammable substrates such as wood, wood products, paper, cardboard, fabric, etc.

It mainly acts as a flame retardant; ammonium dihydrogen phosphate is used as a barrier in fire-retardant coatings. The function of burning agent and expansion catalyst is generally used in combination with carbonizing agent (starch, pentaerythritol, etc.) and foaming agent (melamine, dicyandiamide, etc.). It decomposes into phosphoric acid and metaphosphoric acid and polymerizes into polymetaphosphoric acid. The dehydration effect of the carbonization agent can dehydrate the carbonization agent and release ammonia gas. At the same time, the foaming agent is bubbled and expanded to form a honeycomb insulation layer, which has a good flame retardant effect. However, due to the poor thermal stability of this product, the water solubility is large , Easy to absorb moisture, not suitable for use in humid environment. In recent years, it has been gradually replaced by ammonium polyphosphate.

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