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Preparation method of light-stable polyurethane hard foamed plastic

A technology of rigid foam plastic and light stability, applied in the field of plastics, can solve the problems of color loss, aging, easy yellowing of foam plastic, etc., and achieve the effects of simple process operation, good light resistance and extended service life.

Inactive Publication Date: 2014-04-30
SUZHOU WANTAI VACUUM FIRING FURNACE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used polyisocyanate monomers mainly include 2,4-dimethyl diisocyanate (TDI) and 4,4'-diphenylmethane diisocyanate (MDI). Since TDI and MDI contain rigid aromatic rings, the cohesion of polyurethane is relatively large. , has strong tensile strength, but the presence of aromatic rings will make foamed plastics easy to yellow and age, light resistance and weather resistance are low, plastic foams will become brittle and cracked by sunlight, and the color will fade. Compared with the international advanced level in terms of synthesis and application technology of plastics, there is still a big gap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add metered methyl isobutyl ketone (100.0kg), monohydroxypolyethylene oxide (300.0kg) and 1,4-butanediol (85.0kg) to a dry and clean reactor, and dilaurate Butyl tin (0.82kg), N,N-dimethylformamide (15.8kg), melamine (65.0kg), the kettle is filled with nitrogen or inert gas for protection, heated at 40~60℃, fully stirred for 3~6 hours, and cooled to 25°C, the obtained reaction solution was distilled under reduced pressure, and the organic solvent was recovered to obtain a polyether reactant;

[0016] Add poly 4,4'-diphenylmethane diisocyanate (225.0kg), polyisophorone diisocyanate (210.0kg), light stabilizer-744 (45.2kg), silicone oil polydiisocyanate to the reactant obtained above Methylsiloxane (180.0kg), triethylamine (18.2kg), water (3.2kg), high-speed stirring until foaming, when a large number of foams appear, immediately pour into the mold, and mature at 40~60℃ for 120 minutes , demoulding, that is, high weather resistance polyurethane rigid foam plastic product...

Embodiment 2

[0018] Add metered methyl isobutyl ketone (100.0kg), monohydroxypolyethylene oxide (300.0kg) and 1,4-butanediol (85.0kg) to a dry and clean reactor, and dilaurate Butyl tin (0.89kg), N,N-dimethylformamide (15.8kg), melamine (70.0kg), the kettle is filled with nitrogen or inert gas for protection, heated at 40~60℃, fully stirred for 3~6 hours, and cooled to 25°C, the obtained reaction solution was distilled under reduced pressure, and the organic solvent was recovered to obtain a polyether reactant;

[0019] Add poly 4,4'-diphenylmethane diisocyanate (215.0kg), polyisophorone diisocyanate (200.0kg), light stabilizer-744 (46.6kg), silicone oil polydiisocyanate to the reactant obtained above Methylsiloxane (185.0kg), triethylamine (18.2kg), water (3.2kg), high-speed stirring until foaming, when a large amount of foam appears, immediately pour into the mold, and mature at 40~60°C for 120 minutes , demoulding, that is, high weather resistance polyurethane rigid foam plastic produc...

Embodiment 3

[0021] Add metered methyl isobutyl ketone (100.0kg), monohydroxypolyethylene oxide (300.0kg) and 1,4-butanediol (85.0kg) to a dry and clean reactor, and dilaurate Butyl tin (0.92kg), N,N-dimethylformamide (15.8kg), melamine (75.0kg), the kettle is filled with nitrogen or inert gas for protection, heated at 40~60℃, fully stirred for 3~6 hours, and cooled to 25°C, the obtained reaction solution was distilled under reduced pressure, and the organic solvent was recovered to obtain a polyether reactant;

[0022] Add poly 4,4'-diphenylmethane diisocyanate (205.0kg), polyisophorone diisocyanate (200.0kg), light stabilizer-744 (45.2kg), silicone oil polydiisocyanate to the reactant obtained above Methylsiloxane (180.0kg), triethylamine (18.2kg), water (3.2kg), high-speed stirring until foaming, when a large number of foams appear, immediately pour into the mold, and mature at 40~60℃ for 120 minutes , demoulding, that is, high weather resistance polyurethane rigid foam plastic product...

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PUM

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Abstract

The invention discloses a preparation method of light-stable polyurethane hard foamed plastic. The preparation method comprises the steps of a. adding weighted methyl isobutyl ketone, monohydroxy polyethylene oxide and 1,4-butanediol, as well as dibutyltin dilaurate, N,N-dimethyl formamide and melamine in a dosage for catalysis in a dry clean reaction kettle, wherein the kettle is full of nitrogen or inert gas for protection; heating to 40-60 DEG C, completely stirring for 3-6 hours, and cooling to 25 DEG C for later use; b. carrying out pressure-reduced distilling on reaction liquid obtained in the step a, recovering an organic solvent to obtain a polyether reactant; c. adding poly 4,4'-diphenylmethane diisocyanate, isophorone diisocyanate, a light stabilizer, organic silicon oil, triethylamine and a proper amount of water to the obtained reactant, and stirring at a high speed until foaming; and d. injecting into a mould immediately when a great amount of foams are generated; curing for 50-180 min at 40-60 DEG C, and demoulding, thus obtaining a finished highly weather-resistant polyurethane hard foamed plastic product.

Description

technical field [0001] The invention relates to the field of plastics, in particular to a preparation method of light-stable polyurethane rigid foam. Background technique [0002] Polyurethane is a polymer compound with carbamate group as the repeating unit produced by the reaction of polyisocyanate and polyol. Polyurethane resin has the characteristics of adjustable hardness, wear resistance, solvent resistance, low temperature resistance and strong adhesion with most materials, etc., and has developed rapidly in recent years. In the past few decades, the amount of rigid polyurethane foam has grown rapidly and steadily all over the world. According to the data provided by the IAL report, the global polyurethane consumption in 2001 was 9.876 million tons, of which rigid polyurethane foam was 2.271 million tons, accounting for 23 %, in 2002, the world produced a total of 10.164 million tons of polyurethane products. With the continuous development of the polyurethane industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/48C08G18/32C08G18/08C08K5/3435C08G101/00
CPCC08G18/283C08G18/3206C08G18/724C08G18/755C08G18/7664C08G2110/0025C08G2110/0083
Inventor 李荣华
Owner SUZHOU WANTAI VACUUM FIRING FURNACE RES INST