The amount of polyurethane high efficiency catalyst

2021-11-25   Pageview:159

The amount of PUCH high-efficiency catalyst is directly related to the speed of curing and drying chemical reaction of polyurethane materials, so users should determine their own ideal dosage ratio according to the actual situation of their own materials.

 

 

 

 

 

 

 

 

 

 

 

 

 

Asbestos asbestos is the general name of fibrous hydrated magnesium and sodium silicon-like salt minerals. The advantage of using asbestos in fire retardant coatings is that under similar tensile strength, the strength of asbestos fiber is twice that of glass fiber. Asbestos fiber has a large specific surface area, which improves its strength and toughness. Asbestos is used in fireproof coatings as fillers, extenders and viscosity adjustment polytetrafluoroethylene powder manufacturers aids. However, asbestos has a harmful effect on the human body, so its application is greatly restricted.

Talc Talc is a natural hydrated magnesium silicate with a molecular formula of 3MgO·4SiO, ·HaO. Talc exists in four shapes of particles: fibrous, flake, needle and block (block talc, frozen stone) Only flaky talc powder can be used in fire-resistant coatings. The composition of talc powder is: SiO 240%~62%, MgO 30%~33%, AlgO; 0.2%~11%, Hz O 16%~17% , Fea O 0.1%~1.5%, pH 8.6~9.9, FeO 0.1%~6%, oil absorption (depending on particle size) 28~52g/100g powder, CaO 0.3%~1%, density 2.9g/cm. Talc The relative density of the powder is 2.65, the oil absorption is 30, the refractive index is 1.59, and the particle size is divided into 325 mesh and 200 mesh. The pH value is 7.5~9.5, the whiteness is 65%~92%, and the Mohs hardness is 1~2. The production method is to grind talc into powder materials with different finenesses through mechanical processing.

Adding talcum powder to the fireproof coating has the effect of matting and preventing sedimentation. It can improve the rigidity and bending strength of the fireproof coating, reduce the shrinkage rate, reduce warpage, reduce the thermal expansion coefficient, and reduce the creep tendency, even at higher temperatures. Improve heat distortion temperature, etc. The disadvantage is to reduce the tensile strength of the fireproof coating film and increase the brittleness.

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