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Anti-pollution silicone weather-resistant sealant and preparation method thereof

An anti-pollution and sealant technology, applied in chemical instruments and methods, adhesives, other chemical processes, etc., can solve the problems of sloping pollution, waste of manpower and time, and infiltration of curtain wall panels, to prevent infiltration of pollution, Effects of reduced adsorption and accumulation, high displacement capacity

Active Publication Date: 2017-04-19
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Penetration pollution caused by penetration of small molecular substances such as plasticizers into porous materials such as stone
Ordinary silicone weather-resistant sealants are usually added with silicone oil or other plasticizers in order to improve elasticity and elongation, reduce hardness, and improve extrudability in the formula design; plasticizers or small molecular low-volatile substances are in The sealant does not participate in the cross-linking and curing reaction during the curing process. After a period of time when porous materials such as stone are in contact with the sealant containing plasticizer, the plasticizer will seep from the colloid to the surface of the stone and pollute the stone. Once this pollution cause, there is currently no effective way to eliminate
[0005] 2) Dirty vertical flow pollution on the curtain wall panels after the surface of the glue joint absorbs dust
Accumulated dust and dirt can generally be removed by washing, but wastes labor and time
[0006] For the above-mentioned manifestation 1), it can be effectively solved by using stone silicone weather-resistant sealant. The national standard GB / T 23261-2009 has made relevant regulations on the pollution of silicone sealant for stone, and stipulated the pollution depth. But this is only a regulatory limit for sealant plasticizer migration
[0007] For the pollution phenomenon caused by the dirt adsorption of the above manifestation 2), the use of stone silicone weather-resistant sealant still cannot solve it, so it is necessary to develop a silicone weather-resistant sealant with anti-pollution performance

Method used

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  • Anti-pollution silicone weather-resistant sealant and preparation method thereof
  • Anti-pollution silicone weather-resistant sealant and preparation method thereof
  • Anti-pollution silicone weather-resistant sealant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] An anti-pollution silicone sealant in this embodiment includes the following raw materials in parts by weight:

[0033] 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa.s, 90 parts of nano-active calcium carbonate, 6 parts of methyl tributylketoxime silane, 3 parts of diphenyl dibutylketoxime silane , 1 part of aminopropyltriethoxysilane, 0.8 part of tridecafluorooctyltrimethoxysilane, and 0.06 part of dibutyltin dilaurate.

[0034] The preparation method of the above-mentioned anti-pollution silicone sealant is as follows:

[0035] Add α,ω-dihydroxypolydimethylsiloxane and nano-active calcium carbonate into the kneader, dehydrate and blend for 100min at 100°C and a vacuum of 0.09MPa, and obtain the base material after cooling;

[0036] At room temperature, add the above-mentioned base material into a planetary mixer or a high-speed dispersion mixer, and then add methyl tributylketoxime silane, diphenyl dibutylketoxime silane, aminopropyl t...

Embodiment 2

[0038] An anti-pollution silicone sealant in this embodiment includes the following raw materials in parts by weight:

[0039] 85 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 50000mPa.s, 15 parts of single-ended hydroxyl polydimethylsiloxane with a viscosity of 1000mPa.s, 80 parts of nano-active calcium carbonate, and heavy calcium carbonate 30 parts, 6 parts of phenyl tributylketoxime silane, 4 parts of methyl vinyl dibutyl ketoxime silane, 1 part of aminopropyl triethoxysilane, γ-glycidyl ether oxypropyl trimethoxysilane 0.3 parts, 1.5 parts of heptadecafluorodecyltrimethoxysilane.

[0040] The preparation method of the above-mentioned anti-pollution silicone sealant is as follows:

[0041] Add α,ω-dihydroxy polydimethylsiloxane, single-end hydroxyl polydimethylsiloxane, nano-active calcium carbonate and heavy calcium carbonate into the kneader, at 120°C, the vacuum degree is 0.08MPa Down, dehydration blending 200min, after cooling, base material is obta...

Embodiment 3

[0044] An anti-pollution silicone sealant in this embodiment includes the following raw materials in parts by weight:

[0045] 80 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 80000mPa.s, 20 parts of single-end hydroxyl polydimethylsiloxane with a viscosity of 500mPa.s, 80 parts of nano-active calcium carbonate, and heavy calcium carbonate 40 parts, 2 parts of tetrabutylketoxime silane, 4 parts of methyl tributylketoxime silane, 2 parts of dimethylbis(N-methylacetamido) silane, N-beta aminoethyl γ-aminopropyl 1 part of trimethoxysilane, 2.0 parts of heptadecafluorodecyltriethoxysilane, and 0.03 part of dimethyltin dineodecanoate.

[0046] The preparation method of the above-mentioned anti-pollution silicone sealant is as follows:

[0047] Add α,ω-dihydroxy polydimethylsiloxane, single-end hydroxyl polydimethylsiloxane, nano-active calcium carbonate and heavy calcium carbonate into the kneader, at 140°C, the vacuum degree is 0.09MPa Down, dehydration blendin...

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Abstract

The invention discloses an anti-pollution silicone weather-resistant sealant and a preparation method of the sealant. The anti-pollution silicone weather-resistant sealant comprises the following raw materials in parts by weight: 100 parts of organopolysiloxane, 60-150 parts of inorganic filler, 0.2-5 parts of fluoroalkyl silane, 3-10 parts of a silane composite crosslinking agent, 0.5-3 parts of a silane coupling agent and 0-0.5 part of a catalyst. The test result of the anti-pollution silicone weather-resistant sealant prepared by the invention shows that the sealant can fully satisfy the performance requirement of 50HM in building sealants for stones GB / T 23261-2009 and not only cannot pollute porous materials such as stones and the like, but also has an excellent performance of preventing vertical flow pollution.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an anti-pollution silicone weather-resistant sealant and a preparation method thereof. Background technique [0002] Commonly known as silicone weather-resistant sealant refers to the silicone sealant used to seal the joints between building curtain wall panels. Silicone sealant has good UV resistance, displacement resistance, elastic recovery ability and excellent resistance to commonly used curtain wall materials. Excellent adhesion, becoming the preferred sealing material for building curtain walls. The difference between silicone weather-resistant sealant and ordinary silicone sealant is that it requires high elasticity after vulcanization, that is, the ability to resist high displacement, excellent adhesion and water-resistant adhesion, and excellent weather resistance. [0003] Ordinary silicone weather-resistant sealants have pollution to the curtain wall, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/04C09J11/06C09K3/10
Inventor 蒋金博张冠琦陈文浩曾容
Owner GUANGZHOU BAIYUN CHEM IND
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