Aerogel modified heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic and preparation method thereof

A technology of rigid polyurethane and low thermal conductivity, which is applied in the field of technical polyurethane modification, can solve the problems that airgel is difficult to disperse evenly, cannot achieve the expected effect, and is incompatible, and achieve the effect of shortening the replacement cycle

Inactive Publication Date: 2019-01-18
山东新朗华科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, some people in the prior art directly add airgel into the RPUF body in order to improve the flame retardancy of RPUF. However, due to the ultra-light specific gravity of airgel and the fact that it is an inorganic material, when combined with RPUF organic materials, the two exist. Obvious incompatibility, the airgel is difficult to disperse evenly into the polyurethane body, and the expected effect cannot be achieved

Method used

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  • Aerogel modified heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic and preparation method thereof
  • Aerogel modified heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic and preparation method thereof
  • Aerogel modified heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation method of silicon airgel precursor is:

[0061] (1) Prepare a mixed solution of silicon source and solvent

[0062] Take a water glass with a molar number of 3.0 and put it into a reaction kettle, dilute it with 2.5 times the mass of deionized water, stir at 180 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0063] (2) Sol

[0064]Get 8mol / L sulfuric acid, add zirconium sulfate salt (zirconium sulfate salt is counted as its zirconia, and the mol ratio with the silicon oxide of water glass solution is 5:100), yttrium sulfate salt (yttrium sulfate salt is counted as its yttrium oxide, and The molar ratio of aluminum oxide is 1:100); After mixing evenly, spray and add to the water glass solution that step (1) obtains, carry out rapid stirring with the speed of 1300 rev / min while spraying, when controlling pH value to 1.5 Stop spraying, and the spraying time is controlled at 100 minutes; Obtain sol.

[0065] (3...

Embodiment 2

[0076] The preparation method of silicon airgel precursor is:

[0077] (1) Prepare a mixed solution of silicon source and solvent

[0078] Take a water glass with a molar number of 3.2 and put it into a reaction kettle, dilute it with deionized water of 3 times the mass, stir at 200 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0079] (2) Sol

[0080] Get 10mol / L nitric acid, add aluminum hydrochloride (aluminum hydrochloride is calculated in alumina, and the mol ratio of aluminum oxide and silicon oxide in the water glass solution is 2:100), lanthanum hydrochloride (lanthanum hydrochloride is calculated in lanthanum oxide, and The molar ratio of aluminum oxide is 3:100); After mixing evenly, spray and add to the water glass solution that step (1) obtains, carry out rapid stirring with the speed of 1200 rpm while spraying, control the pH value till 2.5 , the spraying time is controlled at 100 minutes; the sol is obtained.

[008...

Embodiment 3

[0092] The preparation method of silicon airgel precursor is:

[0093] (1) Prepare a mixed solution of silicon source and solvent

[0094] Take water glass with a molar number of 4.0 and put it into a reaction kettle, dilute it with 3 times the mass of deionized water, stir at 80 rpm for 30 minutes, and filter through a 200-mesh sieve to obtain a water glass solution.

[0095] (2) Sol

[0096] Get 15mol / L nitric acid, add aluminum oxalate salt (in terms of aluminum oxide, the mol ratio with silicon oxide in the water glass solution is 3:100), lanthanum oxalate salt (in terms of lanthanum oxide, the mol ratio with aluminum oxide is 6: 100); after mixing evenly, spray and join the water glass solution that step (1) obtains, carry out rapid stirring with the speed of 1800 rev / mins while spraying, control pH value till 2.5, spray time is controlled at 100 minutes ; Get the sol.

[0097] (3) Gel

[0098] Add the sodium hydroxide solution with a pH value of 11.5 to the sol obtai...

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Abstract

The invention relates to aerogel modified heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic and a preparation method thereof. An aerogel composite heat-resistant flame retardant is dispersed into a polyurethane body and is modified to form a polyurethane foamed material, wherein the composite heat-resistant flame retardant is formed by modifying aerogelpowder with a phosphate heat-resistant flame retardant. According to the preparation method, the composite heat-resistant flame retardant of modified aerogel is added into polyurethane foaming plastic(RPUF); the composite heat-resistant flame retardant is uniformly dispersed into an RPUF body; heating, curing and ripening are performed to obtain the heat-resistant and flame-retardant low-thermal-conductivity rigid polyurethane foamed plastic. The modified RPUF provided by the aerogel modified heat-resistant and flame-retardant low thermal conductivity rigid polyurethane foam plastic disclosedby the invention has the characteristics that the heat resistance reaches up to 153 DEG C, the thermal conductivity is lower than 0.027W/m.K, a limiting oxygen index is greater than or equal to 32 percent, and the compressive strength is 0.39 to 0.40MPa.

Description

technical field [0001] The invention belongs to the technical field of polyurethane modification, and relates to an aerogel-modified high-temperature resistance exceeding 153°C, thermal conductivity lower than 0.027W / m·K, limiting oxygen index greater than or equal to 32%; compressive strength 0.39-0.40MPa, rigid polyurethane foam (RPUF) and its preparation method. Background technique [0002] Rigid polyurethane foam (RPUF) is a new type of high-performance, multi-purpose polymer material. With its unique three-dimensional network cell structure, it has excellent thermal insulation, sound absorption, chemical corrosion resistance, load bearing and impact resistance. The density of RPUF and the structure of soft and hard segments on the molecular chain can be adjusted and changed by the type and amount of raw materials in the formula, so RPUF has been widely used in heat preservation, refrigeration, transportation, and other fields. However, the heat-resistant temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08K5/521C08K9/06C08K7/26C08K3/34C08K5/5313C08K13/06C08J9/08
CPCC08G18/3206C08G18/48C08G18/6677C08J9/08C08J2203/02C08J2375/08C08K3/346C08K5/521C08K5/5313C08K7/26C08K9/06C08K13/06
Inventor 刘景松郑星莫伟军
Owner 山东新朗华科技有限公司
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