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A kind of preparation method of heat-expandable polyurethane

A polyurethane and thermal expansion technology, which is applied in the field of polyurethane preparation, can solve the problems of decreased mechanical properties of polyurethane, poor compatibility of polyurethane, and insufficient flame retardant performance, and achieve the effects of enhanced bonding strength, enhanced flame retardant effect, and reduced smoke toxicity

Active Publication Date: 2022-02-15
安徽嘉明新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two flame retardants have their own advantages, but there is inevitably the problem of poor compatibility with polyurethane, which leads to a decrease in the mechanical properties of polyurethane; in addition, the flame retardant effect of reactive flame retardants also varies with the type of flame retardants. Changes, leading to insufficient flame retardant performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of heat-expandable polyurethane comprises the following steps:

[0022] (1) The expanded graphite is immersed in 10wt% sodium hydroxide solution, heated at 60° C. for 3 h, washed with water to neutrality, and dried to obtain hydroxylated expanded graphite, and then the hydroxylated expanded graphite is immersed in a melamine saturated solution of 60° C. for 5 h, Take out, dry, obtain modified expansion agent;

[0023] (2) Add 3kg of modified expansion agent, 1.2kg of chlorinated paraffin-70, and 35kg of thermoplastic polyurethane elastomer into the internal mixer, blend at 173°C for 15min, and the mixing speed is 40 rpm, and then hot press molding , to obtain heat-expandable polyurethane.

Embodiment 2

[0025] A kind of preparation method of heat-expandable polyurethane comprises the following steps:

[0026] (1) The expanded graphite is immersed in 10wt% sodium hydroxide solution, heated at 60° C. for 3 h, washed with water to neutrality, and dried to obtain hydroxylated expanded graphite, and then the hydroxylated expanded graphite is immersed in a melamine saturated solution of 60° C. for 5 h, Take out, dry, obtain modified expansion agent;

[0027] (2) Add 2.5kg of modified expansion agent, 0.5kg of ammonium polyphosphate, 1.2kg of chlorinated paraffin-70, and 35kg of thermoplastic polyurethane elastomer into the internal mixer, blend at 173°C for 15min, and the mixing speed is 40 rpm / min, and then thermocompressed to obtain heat-expandable polyurethane.

Embodiment 3

[0029] A kind of preparation method of heat-expandable polyurethane comprises the following steps:

[0030] (1) Immerse expanded graphite in 12wt% sodium hydroxide solution, heat at 55°C for 2h, wash with water until neutral, and dry to obtain hydroxylated expanded graphite, then immerse hydroxylated expanded graphite in a saturated solution of urea at 40°C for 5h , taken out, and dried to obtain a modified expansion agent;

[0031] (2) Add 2.4kg of modified expansion agent, 0.6kg of urea phosphate, 1.5kg of decabromodiphenylethane, and 38kg of thermoplastic polyurethane elastomer into the internal mixer, blend at 175°C for 12min, and the mixing speed is 40 rpm / min, and then thermocompressed to obtain heat-expandable polyurethane.

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Abstract

The invention discloses a preparation method of heat-expandable polyurethane, which comprises the following steps: adding raw material modified expansion agent, halogen-containing flame retardant, and thermoplastic polyurethane elastomer into a dense mixture at a weight ratio of 2-4:1-2:35-45 The heat-expandable polyurethane is obtained by blending in a mill, and then hot-pressing. The invention overcomes the shortcomings of the prior art, and the flame retardant has little influence on the mechanical properties of the polyurethane, and the flame-retardant effect is good.

Description

technical field [0001] The invention relates to the technical field of polyurethane preparation, in particular to a preparation method of heat-expandable polyurethane. Background technique [0002] Thermoplastic polyurethane is a linear block copolymer composed of oligomer diol soft segments and diisocyanate-chain extender hard segments. TPU can be plasticized after heating and has excellent processing performance; at the same time, TPU has excellent strength, elasticity and wear resistance, and has been widely used in automobiles, coatings, national defense, building materials, clothing, wire and cable and other industries. The limiting oxygen index (LOI) of ordinary TPU is only about 19%, which affects its application in fields with high fire safety requirements such as automobiles and cables. It is very important to modify TPU with flame retardancy. The flame retardant modification of polyurethane mainly adopts the method of adding flame retardants, and flame retardants ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L91/06C08L23/28C08K13/06C08K9/02C08K7/24C08K7/26C08K5/03C08K3/32C08K5/21C08J9/10
CPCC08J9/10C08J9/104C08J9/009C08J9/0066C08J9/0019C08J9/0028C08J9/0095C08J2375/04C08J2491/06C08J2423/28C08J2203/04
Inventor 刘磊杨建军张建安何祥燕吴明元吴庆云刘久逸
Owner 安徽嘉明新材料科技有限公司
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