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Polyurethane foam modifying method

A polyurethane foam and polyurethane prepolymer technology, which is applied in the field of polyurethane foam modification, can solve the problems of unpopularity in the market, high cost and price of polyol polyol, etc., and achieve simple technical methods, improved hydrophilicity, saturated The effect of water absorption capacity and water retention capacity enhancement

Active Publication Date: 2019-03-15
长治学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But described functional polyol polyol cost price is high, is not welcomed by the market

Method used

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  • Polyurethane foam modifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 65 grams of formula (c 1 ) N,N-dimethylaminopolyethylene glycol-600 with the structure shown in ) was dissolved in 40 grams of N,N-dimethylformamide to prepare N,N-dimethylaminopolyethylene glycol -600 N,N-dimethylformamide solution; Weigh 20 grams of 4-methoxybenzyl chloride and dissolve in 20 grams of ethyl acetate to obtain an ethyl acetate solution of 4-methoxybenzyl chloride 30 grams of toluene diisocyanate and 0.01 gram of dibutyltin dilaurate are weighed and dissolved in 26 grams of 1,4-dioxane to obtain a dioxane solution of toluene diisocyanate; the ethyl acetate solution Add to the N,N-dimethylformamide solution, control the reaction temperature at 20-25°C, stir and react for 2 hours, then add the dioxane solution into the reaction system, continue to stir and react for 2 hours, and prepare Deformation (a 1 ) solution of multifunctional polyurethane prepolymer;

[0035]

[0036] formula (a 1 ) The mass percentage content of isocyanate groups in th...

Embodiment 2

[0039] According to the method and operation steps of embodiment 1, the formula (b in embodiment 1 1 ) of the N,N-dimethylaminopolyethylene glycol-600 structure shown in the formula (b 2 ) structure shown in N,N-dimethylaminopolyethylene glycol-2000, 4-methoxybenzyl chloride is replaced by 5-chloromethyl salicylaldehyde, the formula (a 2 ) multifunctional polyurethane prepolymer. Adopt the method determination formula of embodiment 1 (a 2 ) The mass percentage of isocyanate group in the solution of multifunctional polyurethane prepolymer is 3.32%

[0040]

[0041] Adopt embodiment 1 method, use formula (a 2 ) The relative density of the multifunctional polyurethane prepolymer solution is 85Kg / m 3 Open Cell Polyurethane Soft Foam 2cm 3 Cube, the modified polyurethane foam has a saturated water absorption rate of 13.3 times its own mass and a water retention rate of 2.2 times its own mass.

Embodiment 3

[0043] According to the method and operation steps of embodiment 1, the formula (b in embodiment 1 1 ) of the N,N-dimethylaminopolyethylene glycol-600 structure shown in the formula (b 2 ) of N,N-dimethylaminopolyethylene glycol-2000, 4-methoxybenzyl chloride is replaced by 5-chloromethyl salicylaldehyde, toluene diisocyanate is replaced by diphenylmethane di Isocyanate, obtain formula (a 3 ) Multifunctional polyurethane prepolymer. Adopt the method determination formula of embodiment 1 (a 2 ) The mass percentage of isocyanate groups in the solution of the multifunctional polyurethane prepolymer is 3.18%.

[0044]

[0045] Adopt embodiment 1 method, use formula (a 3 ) The relative density of the multifunctional polyurethane prepolymer solution is 32Kg / m 3 Open Cell Polyurethane Soft Foam 2cm 3 Cube, the modified polyurethane foam has a saturated water absorption rate of 8.6 times its own mass and a water retention rate of 1.3 times its own mass.

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Abstract

The invention belongs to the technical field of functional high polymer materials, and particularly relates to a polyurethane foam modifying method. The polyurethane foam modifying method comprises the following steps: first step, uniformly dipping a polyurethane foam which is cleaned thoroughly in a multifunctional polyurethane prepolymer solution, wherein the use amount of the multifunctional polyurethane prepolymer solution is 5-50 times the mass of the polyurethane foam; and second step, taking out the polyurethane foam which has been saturated and adsorbs the multifunctional polyurethaneprepolymer solution, after squeezing the polyurethane foam to be dry, placing the polyurethane foam in an oven, and drying the polyurethane foam for 2-72 hours at the temperature of 20-80 DEG C to obtain the multifunctional polyurethane prepolymer modified polyurethane foam. The hydrophilicity of the obtained polyurethane foam is greatly improved, and saturation water absorbing ability and water retention ability are enhanced obviously. The mechanical property, the biocompatibility and the stability of the polyurethane foam can still be maintained, and meanwhile, the polyurethane foam furtherhas an antibacterial property.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a method for modifying polyurethane foam. Background technique [0002] Polyurethanes (PUs) is a general term for a class of macromolecular polymers containing urethane (-NHCOO-) repeating units in the main chain. It is usually produced by polyaddition reactions between polyols and polyisocyanates. Segment copolymers; Compared with other polymer materials, polyurethane materials have the characteristics of easy design of molecular structure, adjustable performance, good processing performance, various processing methods, and excellent mechanical properties. Through the functional modification of polyurethane materials, while maintaining the excellent properties of polyurethane, and endowing it with unique biological, photoelectromagnetic, thermal and other physical and chemical properties, it has become the main method to expand the application fi...

Claims

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Application Information

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IPC IPC(8): C08J9/228C08L75/08
CPCC08J9/228C08J2375/08
Inventor 王佳佳张田林王暾苏静李梦瑶李燕
Owner 长治学院
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