Polyurethane catalyst DY-12

2021-11-25   Pageview:129

Polyurethane catalyst DY-12: Dibutyltin dilaurate for polyurethane foam, CASE, etc.
















When choosing glass fiber as a reinforcing filler, attention should be paid to issues such as fiber performance, filament diameter, filament length, and fiber content. The glass fibers used for fire retardant coatings are mainly E glass fiber, A glass fiber and C glass fiber.

E glass fiber is an alkali-free glass fiber, which is characterized by good mechanical properties, electrical insulation and water resistance.

C glass fiber is a medium-alkali fiber with about 10% alkali content. Its main feature is acid resistance. The fireproof coating used as a reinforcing filler can be used in a slightly acidic environment.

A glass fiber is a highly alkaline glass fiber, and its alkali content is up to 15%, and some of its amide modified polyethylene wax price properties are not as good as E and C glass fibers. However, because A glass fiber raw materials are easily available (common window glass and bottle glass are A glass fibers), the price is low, and it is still a kind of glass fiber with a considerable amount. Containing glass fiber has the weakness of poor water resistance, and its performance can be improved by surface treatment. For example, after the alkali-containing glass fiber is thermally cleaned and dewaxed, it is soaked in a 5% zinc nitrate solution, and then coated with a silicone-fired water-repellent agent.

The alkali-containing glass fiber treated in this way has been tested and proved that its physical and mechanical properties are close to those used Alkali-free glass fiber treated in the same way. Alkali-free glass fibers are generally used as reinforcing fillers in fire retardant coatings, and the diameter of glass fibers as reinforcing fillers must be controlled within a certain range in order to exert its reinforcing effect. Bulk glass is quite brittle and fragile, and cannot be used directly as an additive. Only when the glass is drawn into filaments can it exhibit a certain tensile strength and better elongation. And the finer the thread is drawn, that is to say the smaller the diameter of the fiber, the better its tensile strength and elongation. Generally speaking, the fiber diameter is 6~9pm. If it is too fine, the processing period will be more difficult, and the price will be more expensive, but it is not cost-effective. Tests have shown that the fiber diameter changes within the range of 6-9 pm, which will not affect the performance of the fire-retardant coating.


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