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Preparation method of modified silicon dioxide emulsion and reflective insulation coating

A reflective heat-insulating coating, silica technology, applied in the direction of reflection/signal coatings, polyurea/polyurethane coatings, coatings, etc. Problems such as the inability of the gel to disperse evenly, to avoid the effect of heat accumulation, avoid agglomeration, and prevent excessive temperature

Pending Publication Date: 2021-04-02
HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO in this patent 2 Airgel cannot be evenly dispersed in the polymer matrix material, and the airgel is easy to agglomerate, which cannot significantly improve the thermal insulation performance of the coating material

Method used

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  • Preparation method of modified silicon dioxide emulsion and reflective insulation coating
  • Preparation method of modified silicon dioxide emulsion and reflective insulation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Put the silica airgel in a constant temperature drying oven at 100°C for 1 hour, take 5 parts by weight of dry silica airgel, 5 parts by weight of KH-550, 5 parts by weight of OP-10, and 70 parts by weight to remove Ionized water, ultrasonically dispersed for 15 minutes, stirred at 80°C for 4 hours, and finally centrifuged, washed and dried to prepare the modified silica airgel. With 5 parts by weight of modified silica airgel, 15 parts by weight of butyl acrylate, 12 parts by weight of styrene, 8 parts by weight of methacrylic acid, 5 parts by weight of OP-10, 0.2 parts by weight of azobisisobutyronitrile ( AIBN), 45 parts by weight of ethylene glycol butyl ether (BG) solvent, stirred and reacted at 80° C. for 2 hours to prepare a modified silica emulsion.

[0045] Get 45 parts by weight of polyurethane emulsion, 10 parts by weight of modified silica emulsion, 1 part by weight of 4100, 1 part by weight of 024, 1 part by weight of 381, 0.5 parts by weight of R299, 4 part...

Embodiment 2

[0048] Put the silica airgel in a constant temperature drying oven at 100°C for 1 hour, take 6 parts by weight of dry silica airgel, 7 parts by weight of KH-560, 7 parts by weight of SDS, and 73 parts by weight of deionized water , ultrasonically dispersed for 15 minutes, stirred at 80°C for 4 hours, and finally centrifuged, washed and dried to prepare the modified silica airgel. 6 parts by weight of modified silica airgel, 17 parts by weight of butyl acrylate, 14 parts by weight of styrene, 10 parts by weight of methacrylic acid, 7 parts by weight of sodium dodecyl sulfate (SDS), 0.3 parts by weight of AIBN , 50 parts by weight of diethylene glycol butyl ether (DBG), stirred and reacted at 80° C. for 2 hours to prepare a modified silica emulsion.

[0049] Get 50 parts by weight of polyurethane emulsion, 12 parts by weight of modified silica emulsion, 0.5 parts by weight of 4100, 0.5 parts by weight of 902W, 0.5 parts by weight of 381, 0.5 parts by weight of R299, 5 parts by w...

Embodiment 3

[0052] Put the silica airgel in a constant temperature drying oven and dry it at 100°C for 2 hours, take 7 parts by weight of dry silica airgel, 9 parts by weight of KH-570, and 9 parts by weight of sodium dodecylbenzenesulfonate (DBS), 77 parts by weight of deionized water, ultrasonically dispersed for 15 minutes, stirred at 80°C for 4 hours, and finally centrifuged, washed and dried to prepare the modified silica airgel. With 7 parts by weight of modified silica airgel, 19 parts by weight of butyl acrylate, 16 parts by weight of styrene, 13 parts by weight of methacrylic acid, 9 parts by weight of DBS, 0.4 parts by weight of dibenzoyl peroxide (BPO) , 60 parts by weight of dipropylene glycol butyl ether (DPNB), stirred and reacted at 80° C. for 2 hours to prepare a modified silica emulsion.

[0053] Get 55 parts by weight of polyurethane emulsion, 14 parts by weight of modified silica emulsion, 0.5 parts by weight of 270, 0.5 parts by weight of 902W, 1 part by weight of 450,...

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Abstract

The invention discloses a preparation method of a modified silicon dioxide emulsion, which comprises the following steps: adding 5-8 parts by weight of modified silicon dioxide aerogel, 15-20 parts byweight of butyl acrylate, 12-18 parts by weight of styrene, 8-15 parts by weight of methacrylic acid, 5-10 parts by weight of emulsifier, 0.2-0.5 part by weight of initiator and 45-65 parts by weightof solvent, and stirring to react at 70-90 DEG C to obtain the modified silicon dioxide emulsion; and the invention also discloses a reflective insulation coating. The coating disclosed by the invention is composed of a double-layer structure, wherein an outer reflecting layer is mainly composed of fluorocarbon resin, hollow glass beads and a reflecting filler; an inner thermal insulation layer is mainly composed of polyurethane resin and silica aerogel, according to the invention, the solar reflectivity is as high as 90% or above, the heat conductivity coefficient is low, and external heat is effectively prevented from diffusing into the coating.

Description

technical field [0001] The invention belongs to the production technical field of heat-insulating polymer coatings, and in particular relates to a preparation method of modified silicon dioxide emulsion and reflective heat-insulating coatings. Background technique [0002] Reflective insulation coatings, also known as solar heat reflective coatings, block the radiation of external heat to the interior of the substrate by reflecting external solar energy. According to the analysis of solar spectrum energy, most of the solar energy is mainly concentrated in the visible light region and the near infrared region, that is, the range of 400-2500nm. The more a reflective insulation coating can reflect sunlight, the better it will insulate. Reflective thermal insulation coatings have been widely used in many fields such as buildings, vehicles, ships, storage and pipeline transportation. Usually, heat-insulating fillers are used as fillers to block the diffusion of external heat. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/18C08F220/06C08F212/08C09D127/12C09D175/04C09D151/10C09D5/33C09D7/61
CPCC08F292/00C09D127/12C09D175/04C09D5/004C09D7/61C09D7/70C08K2003/2241C08K2003/2227C08K2003/2296C08K2003/2244
Inventor 陆腾飞熊一帜张刚李著初阳区
Owner HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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