Polysiloxane block polymer and application thereof

A polysiloxane block, vinyl polysiloxane technology, applied in the field of polysiloxane block polymers, can solve problems such as the protection of harsh structural parts and decorative parts, and achieve remarkable hydrophobic properties and weather resistance. Strong, high cross-linking effect

Inactive Publication Date: 2019-12-20
INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the problem of protection of structural parts and decorative parts under harsh outdoor conditions has not been effectively solved. It is necessary to study a protective coating with hydrophobic and self-cleaning properties to solve the problems existing in the prior art

Method used

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  • Polysiloxane block polymer and application thereof
  • Polysiloxane block polymer and application thereof
  • Polysiloxane block polymer and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of vinyl polysiloxane comprises the following steps: dissolving 10g of ViD3 in 50g of tetrahydrofuran, adding 0.063g of butyllithium n-hexane solution (40% solid content) as an initiator, and stirring and reacting at -20°C for 24h , adding 0.1 g of trimethylchlorosilane and stirring for 0.5 h to end capping, and distilling off the solvent and impurities under reduced pressure to obtain vinyl polysiloxane with a vinyl content of 100%.

[0035] Grafting reaction of click chemistry method: 10g vinyl polysiloxane with 100% vinyl content, mercaptopropyltriethoxysilane with vinyl equimolarity, 90g tetrahydrofuran, 0.01g benzoin dimethyl ether as initiator agent, mixed uniformly, irradiated with ultraviolet light for 10 minutes to complete the reaction, and distilled under reduced pressure to remove solvent and impurities to obtain polysiloxane block polymer.

Embodiment 2

[0039] The preparation of vinyl polysiloxane includes the following steps: mix 10g ViD3 and 77.5g D3 evenly, add 0.2g tetramethylammonium hydroxide as an initiator, stir and react at 30°C for 24h, add 0.12g vinyl The dimethylchlorosilane was stirred for 3 hours to end capping, and the solvent and impurities were distilled off under reduced pressure to obtain vinyl polysiloxane with a vinyl content of 10%.

[0040] Grafting reaction of click chemistry method: 10g vinyl polysiloxane with vinyl content of 10%, mercaptopropyltriethoxysilane with vinyl equimolarity, 90g tetrahydrofuran, 0.01g benzoin dimethyl ether as initiator agent, mixed uniformly, irradiated with ultraviolet light for 10 minutes to complete the reaction, and distilled under reduced pressure to remove solvent and impurities to obtain polysiloxane block polymer.

[0041] Application example: Mix 10g of polysiloxane block polymer, 86g of tetrahydrofuran, 3g of water, and 1g of acetic acid evenly. After standing fo...

Embodiment 3

[0043] The preparation of vinyl polysiloxane includes the following steps: mix 10g ViD3 and 77.5g D3 evenly, add 0.2g tetramethylammonium hydroxide as an initiator, stir and react at 30°C for 24h, add 0.12g vinyl The dimethylchlorosilane was stirred for 3 hours to end capping, and the solvent and impurities were distilled off under reduced pressure to obtain vinyl polysiloxane with a vinyl content of 10%.

[0044] Hydrosilylation reaction: Add 10g of vinylpolysiloxane with a vinyl content of 10%, triethoxysilane in an equimolar amount to vinyl, and 0.01g of Karstedt catalyst in sequence, mix well, and react for 48 hours to obtain polysilicon Oxyalkylene block polymers.

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Abstract

The invention discloses a polysiloxane block polymer and an application thereof. The polysiloxane block polymer is prepared by the following steps: (1) uniformly mixing 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane and hexamethylcyclotrisiloxane, then dissolving the mixture in a first solvent, adding a first initiator for reacting, adding a capping agent for reacting and capping to obtain vinyl polysiloxane; and (2) uniformly mixing the vinyl polysiloxane obtained in the step (1) with a sulfhydryl monomer, a second solvent and a second initiator and performing ultraviolet light irradiation for reacting, or uniformly mixing the vinyl polysiloxane obtained in the step (1) with a hydrosilyl monomer and a catalyst for reacting to obtain the polysiloxane block polymer containing SR<1> groups or R<2> group. According to the invention, through the characteristic of high flexibility of polysiloxane molecular chain segments and the characteristic that the coupling agent tends to an inorganic material after curing and crosslinking, a protective coating with good toughness, high hardness and hydrophobic and self-cleaning characteristics is prepared.

Description

Technical field: [0001] The invention relates to the technical field of polymer materials and fine chemical industry, in particular to a polysiloxane block polymer and its application. Background technique: [0002] Common commercially available vinyl polysiloxanes have a vinyl content of up to 10% (that is, 10% of the silicon atoms are linked to vinyl groups), which is composed of octamethylcyclotetrasiloxane and tetramethyltetravinylcyclotetrasiloxane It is prepared by ring-opening copolymerization of oxane and is used as a raw material for silicone rubber. In fact, the raw materials for preparing silicone rubber do not need too high vinyl content. Common silicone rubber needs to be mixed with polyvinyl polysiloxane and terminal vinyl polysiloxane to achieve optimal strength and toughness. , Higher content of vinyl polysiloxane has not yet been reported due to no application requirements. [0003] In the prior art, the protection of structural parts and decorative parts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/392C08G77/38C09D183/08C09D183/06C09D5/08C09D5/16D06M15/643
CPCC08G77/38C08G77/392C09D5/08C09D5/1675C09D183/06C09D183/08D06M15/643D06M2200/12
Inventor 刘海峰王柱哈成勇孙成军
Owner INST OF IND TECH GUANGZHOU & CHINESE ACADEMY OF SCI
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