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Photocurable liquid silicone rubber catalyst with high dispersibility and preparation method thereof

A technology of liquid silicone rubber and high dispersion, which is applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of poor catalyst dispersion and large consumption , to achieve good dispersion, reduce consumption, convenient and effective recycling

Active Publication Date: 2022-04-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a photocurable liquid silicone rubber catalyst with high dispersibility and its preparation method, which can effectively solve the technical problems of poor dispersibility and large consumption of existing catalysts in silicone matrix

Method used

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  • Photocurable liquid silicone rubber catalyst with high dispersibility and preparation method thereof
  • Photocurable liquid silicone rubber catalyst with high dispersibility and preparation method thereof
  • Photocurable liquid silicone rubber catalyst with high dispersibility and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0025] Such as figure 1 Shown, the preparation method of this catalyst comprises:

[0026] S1 uses chloroplatinic acid as a platinum source and reacts with a strong base at a temperature of 80-100°C (Celsius) to obtain a hexahydroxyplatinic acid metal salt; the strong base is NaOH, KOH or LiOH.

[0027] S2: Reducing tetravalent platinum in hexahydroxyplatinic acid metal salt to divalent platinum, and coordinating with silane-functionalized acetylacetone, stirring and refluxing for 3-12 hours (hours) to suspend solid powder in the solution. Specifically, acetylacetone silane functionalized acetylacetone ligands are (3-methyldimethoxysilyl) acetylacetone, (3-methyldimethoxysilyl) 1-phenyl-1,3-butane Diketone, (3-methyldimethoxysilyl)1,3-diphenyl-1,3-propanedione, (3-methyldimethoxysilyl)1,1,1,5 , any one of 5,5-hexafluoro-2,4-pentanedione or acetylacetone. The molar ratio of platinum to silane-functionalized acetylacetone ligand is 1:2, the reduction temperature is 50-85°C, a...

Embodiment 1

[0029] Example 1: Synthesis of two [(3-methyldimethoxysilyl) acetylacetonate] platinum (II)

[0030] Take 6.0g (gram) H 2 PtCl 6 ·6H 2 O was put into a 100mL (milliliter) single-necked bottle, and 40mL of water was added to dissolve it into a reddish-brown color. After that, 15.6g of NaOH was added, and heated to 110°C for 3h under reflux. In the process of reflux, the solution starts to be yellow, and after half an hour of reaction, the color becomes lighter and gradually becomes transparent and clear; after 1 hour of reaction, yellow suspended powder appears; after 3 hours, the reaction is stopped, and a large amount of yellow powder is precipitated after being cooled in the refrigerator overnight. Sodium hydroxyplatinate (Na 2 Pt(OH) 6 ). Afterwards, the supernatant was poured out, methanol was added to wash the yellow powder three times, filtered with suction, dried and weighed to obtain 3.8 g of the yellow powder. In this process, the yield reached 95.47%.

[0031] W...

Embodiment 2

[0033] Example 2: Synthesis of two [(3-methyldimethoxysilyl) 1-phenyl-1,3-butanedione] platinum (II)

[0034] Weigh 2.5g of prepared Na 2 Pt(OH) 6 (See Example 1) Place in a three-necked flask, add 20mL of water and shake well, then add 4.86g of (3-methyldimethoxysilyl) 1-phenyl-1,3-butanedione and 200uL of Concentrated sulfuric acid was heated to reflux at 85°C to obtain a milky white turbid solution (mixed solution); after that, dilute 400uL HCOOH in 500mL water, and drop the diluted HCOOH into the mixed solution through a constant pressure dropping funnel. Reaction 3h, in this process, solution becomes black or dark green when reaction 1h, upper layer floats a small amount of yellow powder; Then react overnight, stop reaction and filter to obtain light green powder, i.e. bis[(3-methyldimethoxy silyl) 1-phenyl-1,3-butanedione] platinum (II).

[0035] After weighing, the light green powder was 5.32g, and the yield was 75.20%. ICP analysis of this light green powder reveal...

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Abstract

The invention discloses a photocurable liquid silicone rubber catalyst with high dispersibility and a preparation method thereof, wherein the preparation method of the catalyst includes: S1 using chloroplatinic acid as a platinum source, and reacting with a strong base at a temperature of 80-100°C Reaction to obtain hexahydroxyplatinic acid metal salt; S2 reduces tetravalent platinum in hexahydroxyplatinic acid metal salt to divalent platinum, coordinates with silane functionalized acetylacetone, stirs and refluxes for 3~12h to suspend solid in the solution powder; S3 filters the solid powder suspended in the solution, washes it several times, and dries it at a temperature of 50~70°C to obtain a catalyst for photocuring, which effectively solves the problem of poor dispersion of the existing catalyst in the silicone matrix, High consumption and other technical problems.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a light-curing liquid silicone rubber catalyst and a preparation method thereof. Background technique [0002] With the development of silicone rubber, addition-type liquid silicone rubber products are widely used in food, electronic and electrical components, construction, medical, automobile, aerospace and other fields due to their unique properties. In the process of preparing addition-type silicone rubber materials, silicone rubber catalysts play an important role. At present, silicone rubber catalysts are mainly platinum complexes, which are activated by heat to produce catalytic effects, and are used for cross-linking and curing of silicon components to form silicone rubber. This curing method is called thermal curing. Thermal curing essentially causes the silicon component to undergo a hydrosilylation reaction, that is, the C=C bond and the Si-H bond are heated under th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C08L83/07C08L83/05C08K5/00C08J3/28G01N33/44
CPCC08J3/28B01J31/2213G01N33/445C08J2383/07C08J2483/05C08K5/0091B01J2531/828B01J2531/0238B01J2231/323
Inventor 陈超付林杰陈祥斌赵丹丁顺民
Owner NANCHANG UNIV
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