Halogen-free organic phosphorus-nitrogen expandable flame retardant and application thereof to flame-retardant paint

A flame retardant and organophosphorus technology, applied in coatings and other directions, can solve problems such as toxic hydrogen halide gas, environmental pollution, and paint without flame retardants, achieve good flame retardant and smoke suppression, and have little impact on mechanical and physical properties. , good water resistance

Inactive Publication Date: 2012-06-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing halogen-containing flame retardants will produce toxic hydrogen halide gas at high temperature, pollute the environment, and there is currently no widely used flame retardant for the flame retardant of paints. Further provide a kind of halogen-free organophosphorus-nitrogen intumescent flame retardant and its application in flame retardant paint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a 250ml round bottom flask, add 10g of phosphorus pentoxide and 30ml of phosphoric acid, heat at 100°C for 1 hour, then add 15g of cellulose, then add 30g of urea, stir for half an hour; add 50ml after cooling to room temperature Dilute with water, then add ethylenediamine to neutralize to pH=5.5; it is the product A of this flame retardant. Mix this product with melamine at a ratio of 2:1 (by weight), or with polyphosphoramide at a ratio of 9:1, and pulverize it to become a better paint flame retardant.

[0039] Add 3 grams of the flame retardant to the polyurethane paint, and after mixing evenly, the properties of the obtained flame retardant paint are:

[0040] The flame retardant time is 15 minutes (large plate combustion method);

[0041] Flame propagation speed 50% (tunnel combustion method);

[0042] Oxygen index 28.3;

[0043] Carbonization volume 26cm 3 , weight loss 3.4g (chamber combustion method);

[0044] Flame retardant level three; adhesion level ...

Embodiment 2

[0047] In a 250ml small ceramic reaction tank, add 20g of phosphorus pentoxide and 50ml of phosphoric acid, heat at 90°C for 1.5 hours, add 10g of starch, then add 15g of melamine, and keep stirring for 20 minutes. Then add 50ml of ethanol to wash, filter under reduced pressure, and dry the filter residue to obtain the B-type flame retardant product of the present invention, which can be directly crushed and added to the paint.

[0048] Add 3 grams of this flame retardant to 10 grams of polyurethane paint, and after mixing evenly, the properties of the obtained flame retardant paint are:

[0049] The flame retardant time is 16 minutes (large plate combustion method);

[0050] Flame propagation speed 45% (tunnel combustion method);

[0051] Oxygen index 25.5;

[0052] Carbonization volume 30cm 3 , weight loss 4.0g (chamber combustion method);

[0053] Level three; adhesion level one;

[0054] Antistatic performance: Surface resistance 5×10 6 Ω.

Embodiment 3

[0056] In a small stainless steel reaction tank, add 5 grams of phosphorus pentoxide and 20 ml of phosphoric acid, heat at 120 ° C for 2 hours, add 15 grams of pentaerythritol, then add 15 grams of urea, and keep stirring for 40 minutes; after cooling to room temperature, Add 50ml of water to dilute, then add triethanolamine to neutralize to pH = 7; add 100ml of methanol to wash at 20°C, filter under reduced pressure, and dry the filter residue to obtain the C-type flame retardant product of the present invention. The flame retardant product can be used directly after crushing.

[0057] Add 3 grams of this flame retardant to 10 grams of polyurethane paint, and after mixing evenly, the properties of the obtained flame retardant paint are:

[0058] The flame retardant time is 14 minutes (large plate combustion method);

[0059] Flame propagation speed 47% (tunnel combustion method);

[0060] Oxygen index 27.1;

[0061] The carbonization volume is 28cm3, and the weight loss is...

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PUM

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Abstract

The invention provides a halogen-free organic phosphorus-nitrogen expandable flame retardant and an application thereof to flame-retardant paint. A preparation method of the halogen-free organic phosphorus-nitrogen expandable flame retardant comprises the following steps of: mixing 1 part by weight of phosphorus pentoxide with 1-3 parts by weight of phosphoric acid; under a stirring condition, adding 0.5-1 part by weight of a char forming agent and 2-4 parts by weight of a foaming agent in sequence into a mixture; adding an amine compound for neutralizing till the pH value is 5-7; and drying filter residues to obtain the halogen-free organic phosphorus-nitrogen expandable flame retardant. Anti-static flame-retardant paint is prepared by uniformly mixing 15-35 percent by weight of the halogen-free organic phosphorus-nitrogen expandable flame retardant into ordinary paint. The expandable flame retardant has a phosphorus-nitrogen synergistic effect. In the expandable flame retardant, phosphorus and nitrogen are taken as flame retardants of flame retardant elements. During burning of a high polymer containing the type of flame retardants, a uniform porous carbon foam layer can be formed on the surface; and the foam layer has the advantages of heat insulation, oxygen insulation, smoke inhibition, prevention of fused drops and good flame retarding and smoke inhibiting functions.

Description

technical field [0001] The invention relates to a halogen-free organophosphorus-nitrogen expansive flame retardant and its application in flame retardant paint, belonging to the technical field of flame retardants and applications. Background technique [0002] Although inorganic flame retardants have the advantages of good thermal stability, low toxicity or non-toxicity, no corrosive gas, non-volatile and non-precipitating during storage, and long-lasting flame-retardant effects, the addition of inorganic flame retardants is large when used, and often It has a great adverse effect on the mechanical and physical properties of the matrix; the halogen-containing flame retardant should be relatively good in flame retardant effect, but it will produce toxic hydrogen halide gas at high temperature, which will pollute the environment to a certain extent, especially It is the C-Br bond that will release bromine when it is placed at room temperature for a long time. When it is added...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D5/00
Inventor 汪志勇查正根万常峰唐林李运峰汪苏靖
Owner UNIV OF SCI & TECH OF CHINA
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