CN102464807A - Fire retardant - Google Patents

Abstract

The invention provides a fire retardant, which is prepared from main raw materials of melamine and ammonium biphosphate easily available in market through one-step synthesis. The fire retardant has characteristics of simple production technology, halogen-free product and good flame resistance and can be used as an additive fire retardant for polyolefin materials (e.g. polypropylene, polyethylene and polystyrene).

Description

A kind of fire retardant

1. characteristics and purposes

In plastics kingdom, polyolefin plastics output is big, and purposes is wide, occupies crucial status.Yet polyolefin plastics is inflammable, so the fire-retardant problem of polyolefin plastics generally receives people's attention.Polyolefine fire retardant commonly used has Halogen rope organise platform thing, inorganic fire-retarded chaste tree and phosphatization platform thing etc.Ancient halogen compound can discharge deleterious hydrogen halide when burning, and the general addition of inorganic combustion inhibitor is bigger, can influence the polyolefine fundamental property.These article are to be that main raw material makes through one-step synthesis with trimeric cyanamide that is easy to get on the market and primary ammonium phosphate.Have that production technique is simple, product characteristics such as Halogen rope, flame retardant properties be not good, can be used as the additive flame retardant of polyolefine material (like Vestolen PP 7052, Vilaterm, PS etc.).

2. starting material

(1) trimeric cyanamide

(2) primary ammonium phosphate has another name called monoammonium phosphate, an alkali ammonium phosphate, colourless tetragonal crystal or white powder, odorless.Soluble in water, be slightly soluble in ethanol, be insoluble to acetone, it is acid that the aqueous solution is.Stable in the air.190 ℃ of fusing points, but have when being higher than 100 ℃ small portion to decompose.Be these article main raw material.

3. fill a prescription (weight part)

Trimeric cyanamide 12～130

Primary ammonium phosphate 220～240

Water 120～130

4. prepare and method of use

(1) primary ammonium phosphate and water are pressed in the proportional quantity elder generation adding reactor drum, under constantly stirring, primary ammonium phosphate is all dissolved.

(2) above-mentioned ammonium dihydrogen phosphate aqueous solution is heated to rapidly near 100 ℃, under stirring fast, adds trimeric cyanamide quickly and evenly, add the back and under insulation, continue to stir 20～30 minutes.

(3) white depositions is filtered after being chilled to room temperature, filter cake is crushed to 10～30 microns and promptly gets product after 80～90 ℃ of vacuum-drying.

When these article were used as the fire retardant of materials such as Vestolen PP 7052, Vilaterm, nylon, addition was 10%～20% (weight).Add the tensio-active agent o.5%～2% of total amount of material simultaneously, during like sodium lauryl sulphate, alkyl sulfonic acid sodium etc., have better flame retardant effect.

Claims (1)

1. the present invention is a kind of fire retardant, and characteristics are following:

Trimeric cyanamide and primary ammonium phosphate to be easy to get on the market are that main raw material makes through one-step synthesis, can be used as the additive flame retardant of polyolefine material (like Vestolen PP 7052, Vilaterm, PS etc.).