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Expandable graphite hard polyurethane composite thermal insulation material and preparation method thereof

A composite thermal insulation material and rigid polyurethane technology, applied in the field of building thermal insulation and flame retardant materials, can solve the problems of unverified use effect, complex preparation process, neglect of thermal conductivity, etc., achieve simple and rapid processing technology, reduce heat transfer, and reduce raw materials cost effect

Active Publication Date: 2021-07-23
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain low thermal conductivity, heat-resistant and flame-resistant rigid polyurethane foam, its preparation process is not only complicated, but also whether the final airgel can be uniformly dispersed in the matrix and whether the nanoporous effect of the airgel always exists is a problem. The actual use effect is yet to be verified
[0007] The patent application number is 201910868490.X's invention patent "a low-smoke flame-retardant rigid polyurethane foam and its preparation method" (application date: 2019.09.16), by introducing appropriate ethylene glycol hypophosphite and expandable graphite , phosphate and hypophosphite, so that the prepared rigid polyurethane foam has high-efficiency flame retardancy, but in addition to high flame retardancy, the insulation material must also have good heat insulation performance, this technology ignores rigid polyurethane foam Does the thermal conductivity of foam material change due to the introduction of flame retardant components?

Method used

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  • Expandable graphite hard polyurethane composite thermal insulation material and preparation method thereof
  • Expandable graphite hard polyurethane composite thermal insulation material and preparation method thereof
  • Expandable graphite hard polyurethane composite thermal insulation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation of airgel-expandable graphite rigid polyurethane composite insulation material comprises the following steps:

[0052] S1, SiO 2 The synthesis process of airgel consists of three steps.

[0053] The first step is gel preparation, the second step is aging and solvent exchange, and the third step is surface modification and gel drying. First add the water-glass mixture in deionized water at a volume ratio of 1:4. Then tartaric acid was slowly added to the mixture while stirring continuously until the pH of the mixture reached 4–5 and then stirred for 10 minutes. The resulting mixture was transferred to a sealed flask to form a gel, and the resulting gel was left to age for 4 hours. The aging process is to complete the gel formation reaction and improve the strength of the gel structure. In order to remove residual sodium ions, the resulting gel was washed 4 times every 6 h, and placed in isopropanol and n-hexane at 55 °C for 24 h, respectively. The su...

Embodiment 2

[0059] The preparation of airgel-expandable graphite rigid polyurethane composite insulation material comprises the following steps:

[0060] S1. The specific experimental process is the same as that of S1 in Example 1.

[0061] S2, first polyether polyol 4110A, SiO 2 The airgel and expandable graphite were dried in an infrared electric blast drying oven at 80°C for 24 hours to remove moisture.

[0062] S3. Add 6g of hard foam silicone oil AK158, 0.6g of triethylenediamine, 2g of deionized water, 3g of TCEP and 6g of DMMP to 100g of polyether polyol 4110A, and stir and mix at a speed of 1500 rpm for 20 minutes to obtain a polyol matrix.

[0063] S4, 4g SiO 2 Airgel and 15g of expandable graphite were sequentially added to 130g of polymeric isocyanate matrix, and after being fully stirred with a mechanical stirrer at a speed of 2000 rpm, the mixture was exposed to ultrasonic waves for 20-30 minutes to make the nanoparticles in the Uniformly dispersed in the matrix without a...

Embodiment 3

[0066] The preparation of airgel-expandable graphite rigid polyurethane composite insulation material comprises the following steps:

[0067] S1. The specific experimental process is the same as that of S1 in Example 1.

[0068] S2, first polyether polyol 4110A, SiO 2 The airgel and expandable graphite were dried in an infrared electric blast drying oven at 80°C for 24 hours to remove moisture.

[0069] S3. Add 8g of hard foam silicone oil AK158, 1g of triethylenediamine, 3g of deionized water, 3g of TCEP and 6g of DMMP to 100g of polyether polyol 4110A in sequence, and stir and mix for 20 minutes at a speed of 1500 rpm with a mechanical stirrer , to obtain a polyol matrix.

[0070] S4, 2g SiO 2 Airgel and 10g of expandable graphite were sequentially added to 130g of polymeric isocyanate matrix, and after being fully stirred with a mechanical stirrer at a speed of 2000 rpm, the mixture was exposed to ultrasonic waves for 20-30 minutes to make the nanoparticles in the Unifo...

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Abstract

The invention discloses a preparation method of an expandable graphite hard polyurethane composite thermal insulation material. The preparation method comprises the following steps of: S1, preparing SiO2 aerogel; and S2-S5, preparing rigid polyurethane foam plastic, so as to obtain the aerogel-expandable graphite rigid polyurethane composite thermal insulation material. According to the expandable graphite hard polyurethane composite thermal insulation material and the preparation method thereof, the hard polyurethane composite thermal insulation material with a lower heat conductivity coefficient is obtained, meanwhile, the cost of raw materials is reduced, and the production period is shortened.

Description

technical field [0001] The invention relates to the technical field of building thermal insulation and flame retardant materials, in particular to an expandable graphite rigid polyurethane composite thermal insulation material and a preparation method thereof. Background technique [0002] With the continuous improvement of energy saving and emission reduction requirements in various countries, improving the heat insulation and flame retardancy of building envelopes has become the key to reducing energy waste and improving building safety. Compared with traditional thermal insulation materials such as resin composite panels, new thermal insulation materials need to have better thermal properties, which can significantly improve the stability and durability of high-rise buildings, reduce wall thickness, and lower construction costs. [0003] In the polymer, the unique closed-cell network structure of rigid polyurethane foam makes it have a lower density (40-60kg / m 3 ), therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08K9/06C08K7/26C08K7/24C08K5/521C08K5/5333C08J9/14C08J9/00C08L75/08
CPCC08G18/48C08K9/06C08K7/26C08K7/24C08K5/521C08K5/5333C08J9/144C08J9/0095C08J9/009C08J2375/08C08J2203/142C08J2205/10C08K2201/011
Inventor 侯龙涛刘云鹏梁立兴史志鹏牛康民田党信刘春辉刘静许达
Owner UNIV OF SCI & TECH BEIJING
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