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Low-viscosity and high-strength transparent dealcoholized organosilicon sealant and production method thereof

A high-strength, low-viscosity technology, applied in adhesives, polymer adhesive additives, adhesive additives, etc., can solve problems such as poor mechanical properties, poor reinforcement, inability to meet stress offset, sealing and shock absorption, etc.

Pending Publication Date: 2022-03-18
GUANGZHOU BAIYUN CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone resin has the advantages of high transparency, non-thickening, high reinforcement, and no limit on the number of additions. However, when used alone, the reinforcing effect is poor, and it is often supplemented with other reinforcing fillers (such as white carbon black, calcium carbonate, etc.) Used together to get the most out of their reinforcing effects
[0003] Therefore, condensation-type transparent silicone sealants generally have poor mechanical properties and low tensile strength, which are greatly restricted in practical applications. Long-term use requirements for offsetting stress, sealing and shock absorption, etc.

Method used

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  • Low-viscosity and high-strength transparent dealcoholized organosilicon sealant and production method thereof
  • Low-viscosity and high-strength transparent dealcoholized organosilicon sealant and production method thereof

Examples

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Effect test

Embodiment 1

[0036] A low-viscosity, high-strength transparent dealcoholized silicone sealant, characterized in that: by weight, it includes the following components:

[0037] Alkoxy-terminated polydimethylsiloxane 100; Methoxy-modified silicone resin 10;

[0038] Methyl MQ silicone resin 10; Crosslinker 5;

[0039] Coupling agent 1; Composite catalyst 1;

[0040] The preparation method of methoxy-modified silicone resin in a low-viscosity, high-strength transparent dealcoholized silicone sealant component is as follows: add 100 parts of vinyl MQ silicone resin (the vinyl The vinyl content of MQ silicone resin is 1.32%), add toluene to dissolve, and slowly drop 5 parts of trimethoxysilane under rapid stirring at room temperature. Stir until evenly dispersed, vacuumize and inflate with nitrogen three times each, then add 0.05 parts of platinum catalyst dropwise, raise the temperature to 75°C and stir for 6 hours under the protection of nitrogen; transfer the obtained product to a round bo...

Embodiment 2

[0044] A low-viscosity, high-strength transparent dealcoholized silicone sealant, characterized in that: by weight, it includes the following components:

[0045] Alkoxy-terminated polydimethylsiloxane 100; Methoxy-modified silicone resin 15;

[0046] Methyl MQ silicone resin 20; Crosslinker 8;

[0047] Coupling agent 1.5; Compound catalyst 1.2;

[0048] The preparation method of methoxy-modified silicone resin in a low-viscosity, high-strength transparent dealcoholized silicone sealant component is as follows: add 100 parts of vinyl MQ silicone resin (the vinyl The vinyl content of MQ silicone resin is 1.82%), add toluene to dissolve, and slowly drop 7 parts of trimethoxysilane under rapid stirring at room temperature. Stir until evenly dispersed, vacuumize and inflate with nitrogen three times, then add 0.08 parts of platinum catalyst dropwise, raise the temperature to 70°C under nitrogen protection and stir for 4 hours; transfer the obtained product to a round bottom flas...

Embodiment 3

[0052] A low-viscosity, high-strength transparent dealcoholized silicone sealant, characterized in that: by weight, it includes the following components:

[0053] Alkoxy-terminated polydimethylsiloxane 100; Methoxy-modified silicone resin 25;

[0054] Methyl MQ silicone resin 25; Crosslinker 6;

[0055] Coupling agent 1.5; Compound catalyst 0.8;

[0056] The preparation method of methoxy-modified silicone resin in a low-viscosity, high-strength transparent dealcoholized silicone sealant component is as follows: add 100 parts of vinyl MQ silicone resin (the vinyl The MQ silicone resin has a vinyl content of 1.82%), was dissolved by adding toluene, and slowly dropped into 6 parts of trimethoxysilane under the state of rapid stirring at room temperature. Stir until evenly dispersed, vacuumize and inflate with nitrogen three times, then add 0.06 parts of platinum catalyst dropwise, raise the temperature to 55°C and stir for 8 hours under the protection of nitrogen; return to roo...

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Abstract

The invention discloses a transparent dealcoholized organosilicon sealant with low viscosity and high strength, which is characterized by comprising the following components in parts by weight: 100 parts of alkoxy-terminated polydimethylsiloxane; 5 to 50 parts of methoxy modified silicon resin; 5-50 parts of methyl MQ silicone resin; 3-10 parts of a cross-linking agent; 0.5-3 parts of a coupling agent; 0.5-3 parts of a compound catalyst; the invention also discloses a production method of the transparent dealcoholized organosilicon sealant with low viscosity and high strength. The low-viscosity and high-strength transparent dealcoholized organosilicon sealant has the advantages of high mechanical strength and low viscosity, and can be widely applied to the fields of electronic appliances, high-end medical equipment, automobile industry and the like; the production method disclosed by the invention is simple to operate, good in reproducibility and small in dust.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to the technical field of silicone sealants. Background technique [0002] Transparent silicone sealants are widely used in the bonding and sealing of electronic appliances, aerospace, automotive industry, high-end medical equipment and other fields. Due to the special requirements of transparency, the range of fillers for silicone rubber is limited, generally different types of fumed silica and MQ silicone resin; silica is one of the ideal reinforcing fillers for silicone rubber, with significant reinforcement The viscosity and consistency of liquid silicone rubber will increase sharply; high-strength transparent silicone rubber must be reinforced with high-volume white carbon black, and its state is generally high-viscosity paste, which cannot be used for leveling, Construction techniques such as brushing; and low-viscosity transparent silicone rubber due to the limi...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/08
CPCC09J183/04C09J11/08C08L2201/10C09J2203/326C09J2203/354C08L83/04
Inventor 洪展鹏付子恩戴飞亮罗元章周波雄
Owner GUANGZHOU BAIYUN CHEM IND
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