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Method for improving flame retardant property of polyurethane foam

A technology of polyurethane foam and flame retardant properties, applied in the field of foam plastic modification, can solve the problems of large amount of flame retardants, poor compatibility between flame retardants and substrates, and inability to effectively exert flame retardant effects, etc., to achieve Improve flame retardant performance and enhance the effect of mechanical properties

Inactive Publication Date: 2018-12-28
德清舒华泡沫座椅有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the fact that the halogen elements in the flame retardant in the prior art are easy to volatilize and produce toxic gases when they play a flame retardant role, which is more harmful to the environment and the human body, and at the same time, the compatibility between the flame retardant and the substrate Poor performance, unable to effectively exert the flame retardant effect, and the problem that the amount of flame retardant added is too large. A method for improving the flame retardant performance of polyurethane foam is provided. After the polyurethane foam is treated by this method, it can be greatly improved. Improve the flame retardant performance of polyurethane foam to a certain extent, and avoid the formation of a good flame retardant that can self-absorb the halogen-containing harmful gases produced by volatilization and combustion and play a secondary flame retardant effect while exerting a good flame retardant effect. combustion system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Wash the polyurethane foam, immerse it in absolute ethanol for immersion treatment in an environment of 0.3 atm, take it out after it no longer generates bubbles, and then immerse it in decahydronaphthalene for 5 minutes;

[0036] 2) prepare pretreatment liquid, its step is:

[0037] a) Add methyl p-toluenesulfonate and 2-ethyl-4,5-dihydrooxazoline to anhydrous acetonitrile to prepare a mixed solution, the concentration of methyl p-toluenesulfonate in the mixed solution is 0.2mmol / L , the concentration of 2--ethyl-4,5-dihydrooxazoline is 1.05mmol / L, the mixture is ultrasonically oscillated for 20min, then heated at 80°C for 48h, and the solvent is evaporated to dryness to obtain a powder ;

[0038] b) Add the powder obtained in step a) into 18wt% hydrogen chloride solution, the mass ratio of the used powder to the hydrogen chloride solution is 15:18, stir for 15 minutes, then place it at 100°C for 24 hours, and rotate to evaporate Slowly add saturated sodium hydrox...

Embodiment 2

[0045] 1) Washing the polyurethane foam, immersing it in absolute ethanol in an environment of 0.5 atm for immersion treatment, taking it out after it no longer generates bubbles, and then immersing it in decahydronaphthalene for 10 minutes;

[0046] 2) prepare pretreatment liquid, its step is:

[0047] a) Add methyl p-toluenesulfonate and 2-ethyl-4,5-dihydrooxazoline to anhydrous acetonitrile to prepare a mixed solution, the concentration of methyl p-toluenesulfonate in the mixed solution is 0.3mmol / L , the concentration of 2--ethyl-4,5-dihydrooxazoline is 1.35mmol / L, the mixture is ultrasonically oscillated for 25min, then heated at 85°C for 50h, and the solvent is evaporated to dryness to obtain a powder ;

[0048] b) Add the powder obtained in step a) into 19wt% hydrogen chloride solution, the mass ratio of the used powder to the hydrogen chloride solution is 15:22, stir for 20 minutes, place it at 115°C for 26 hours, and rotate to evaporate Slowly add saturated sodium h...

Embodiment 3

[0055] 1) Washing the polyurethane foam, immersing it in absolute ethanol in an environment of 0.35 atm for immersion treatment, taking it out after it no longer generates bubbles, and then immersing it in decahydronaphthalene for 10 minutes;

[0056] 2) prepare pretreatment liquid, its step is:

[0057] a) Add methyl p-toluenesulfonate and 2-ethyl-4,5-dihydrooxazoline to anhydrous acetonitrile to prepare a mixed solution, the concentration of methyl p-toluenesulfonate in the mixed solution is 0.3mmol / L , the concentration of 2--ethyl-4,5-dihydrooxazoline is 1.05mmol / L, the mixture is ultrasonically oscillated for 25min, then heated at 80°C for 48h, and the solvent is evaporated to dryness to obtain a powder ;

[0058] b) Add the powder obtained in step a) into 18t% hydrogen chloride solution, the mass ratio of the powder used to the hydrogen chloride solution is 15:20, stir for 20 minutes, place it at 110°C for 24 hours, and rotate to evaporate Slowly add saturated sodium h...

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Abstract

The invention relates to the field of modification of foamed plastics, in particular to a method for improving the flame retardant property of polyurethane foam. The method comprises the following steps: firstly, washing the polyurethane foam; secondly, preparing a pretreatment liquid: (a) preparing methyl p-toluenesulfonate and 2-ethyl-4,5-dihydrozoline into a mixed liquid, oscillating and carrying out heating reaction to obtain powder; (b) adding the powder into hydrogen chloride for reacting, evaporating to dryness and dropwise adding sodium hydroxide, filtrating, washing and drying to obtain a white solid; (c) mixing the white solid with methanol, adding sodium hydroxide and carbon disulfide, reacting for separating out precipitate, filtering, washing and grinding to obtain fine powder; (d) mixing sodium hypophosphite, melamine, chlorinated phosphate, tetrachlorobisphenol A and magnesium hydroxide into a mixture, and adding a solvent and a coupling agent to obtain a base liquid; (e) adding a composition into the base liquid, adding the fine powder to obtain dispersion liquid and oscillating to obtain a pretreatment liquid; thirdly, impregnating the polyurethane foam with the pretreatment liquid; fourthly, impregnating the polyurethane foam with copper-containing industrial waste liquid.

Description

technical field [0001] The invention relates to the field of foam plastic modification, in particular to a method for improving the flame retardancy of polyurethane foam. Background technique [0002] Polyurethane foam is made of isocyanate and hydroxyl compound through polymerization and foaming. According to its hardness, it can be divided into two types: soft and hard, of which soft is the main variety. Generally speaking, it has excellent elasticity, softness, elongation and compressive strength; good chemical stability, resistance to many solvents and oils; excellent abrasion resistance, 20 times larger than natural sponge; and excellent processing It is a kind of cushioning material with excellent performance, but the price is relatively high. [0003] Polyurethane foam generally improves the flame retardancy of the foam by adding flame retardants to delay burning, block smoke and even self-extinguish the burning part. Polyols containing flame retardant elements (tha...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08L75/04
CPCC08J9/40C08J2375/04
Inventor 卢伟蔡盼盼
Owner 德清舒华泡沫座椅有限公司
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