Dealcoholization type cured organosilicone sealant and preparation method thereof

An organosilicon and dealcoholized technology, applied in adhesives and other directions, can solve the problems of no transparent effect, complex production process, instantaneous viscosity increase, etc., to meet the requirements of industrial scale-up production, short process steps, and less demanding process requirements. Effect

Inactive Publication Date: 2013-06-12
西卡(江苏)工业材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the patent scheme directly uses α, ω-dihydroxy polydimethylsiloxane as the base polymer, there is a viscosity peak in the production process, and the instantaneous viscosity increases several times, and the production process is relatively complicated, which will damage the equipment. Larger, which has been mentioned in the collection of papers of the 15th National Silicone Academic Exchange Conference "Alkoxy-terminated One-Component Room Temperature Vulcanized Silicone Rubber Adhesive"
In addition, because the patent uses titanate as a catalyst, and titanate is a brownish-yellow liquid, so it does not have a transparent effect, which limits the scope of application

Method used

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  • Dealcoholization type cured organosilicone sealant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A) To prepare 107 end-capped silicone oil (also called synthetic 107 end-capped silicone oil), 100 parts of double-ended hydroxyl polydimethylsiloxane and methyltrimethoxysilane weighed in parts by weight and with a viscosity of 5000CP Put 5 parts into the reaction container, react at a reaction temperature of 80°C for 120min under stirring, and raise the temperature to 140°C after the reaction is completed and vacuumize until the vacuum degree is lower than -0.1MPa, and the vacuuming time is 60min. Remove the unreacted crosslinking agent, that is, remove the unreacted methyltrimethoxysilane, vacuumize and cool to room temperature under nitrogen protection gas to obtain 107 blocked silicone oil;

[0021] B) Prepare the finished product, mix the 107 end-capped silicone oil obtained in step A) with 10 parts of calcium carbonate with a particle size of 5000 mesh and a water content of less than 0.1% in parts by weight, and then vacuumize and stir, that is Stir in a vacuum ...

Embodiment 2

[0023] A) To prepare 107 end-capped silicone oil (also called synthetic 107 end-capped silicone oil), 100 parts of double-ended hydroxyl polydimethylsiloxane and methyltrimethoxysilane weighed in parts by weight and with a viscosity of 5000CP Put 7 parts into the reaction container, react at a reaction temperature of 75°C for 130 minutes under stirring, and raise the temperature to 135°C after the reaction is completed and vacuumize until the vacuum degree is lower than -0.1MPa. Remove the unreacted crosslinking agent, that is, remove the unreacted methyltrimethoxysilane, vacuumize and cool to room temperature under nitrogen protection gas to obtain 107 blocked silicone oil;

[0024] B) To prepare the finished product, mix the 107 end-capped silicone oil obtained in step A) with 100 parts of calcium carbonate with a particle size of 3000 mesh and a water content of less than 0.1% in parts by weight, and then vacuumize and stir. The vacuum degree of vacuum is lower than -0.1MPa...

Embodiment 3

[0026] Only change the viscosity of the double-terminated hydroxyl polydimethylsiloxane in step A) to 2000CP, change the crosslinking agent to 5.5 parts by weight of vinyltrimethoxysilane, and change the reaction temperature and time to 85°C and 110min, change the heating temperature after the reaction to 145°C, and change the vacuuming time to 55min; only change the reinforcing filler in step B) to be synthesized by the gas phase method and have a moisture content of less than 0.6%. Silicon dioxide, the parts by weight of this silicon dioxide is 200 parts, the time of vacuum stirring is changed to 22min, the combination of KH792 and KH560 is used instead of the silane coupling agent, and the parts by weight of KH792 is 0.3 parts, And the parts by weight of KH560 is 0.4 parts, the parts by weight of catalyst dibutyl tin diacetate is changed into 0.02 parts, the time of stirring is then changed into 18min, and all the other are the same as the description to embodiment 1.

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Abstract

The invention discloses a dealcoholization type cured organosilicone sealant and a preparation method thereof and belongs to the technical field of high polymer materials. The dealcoholization type cured organosilicone sealant consists of the following raw materials in parts by weight: 100 parts of 107 silicon oil, 10-200 parts of reinforcement filler, 0.1-1 part of silane coupling agent, 0.01-0.5 part of catalyst and 5-7 parts of cross-linking agent. The dealcoholization type cured organosilicone sealant has the advantages that sizing depth is 5mm, and the sealant can be cured within 24 hours, so that the sealant has excellent curing speed; because the tensile strength and the elongation at break can respectively reach 2MPa and 200-500 percent, the sealant has excellent mechanical properties; because the sealant is not yellowed within 1000 hours at the temperature of 150 DEG C and is not cracked, the sealant has outstanding ageing resistance; because the storage time can be 9-12 months long, the sealant has ideal stability; the sealant can be suitable for sealing a solar module frame; and because the provided preparation method is simple in process steps and the process requirements are not strict, the industrial large-scale production requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a dealcoholized fast-curing silicone sealant, and also relates to a preparation method thereof. Background technique [0002] Dealcoholized silicone sealants can be found in published Chinese patent documents, typically such as "a kind of dealcoholized silicone sealant that is resistant to heat and humidity and stable in storage" recommended by the invention patent authorization announcement number CN101768420B. The composition (by weight) is: 0-200 parts of low molecular weight silicone oil, 0-300 parts of filler, 100 parts of α, ω-dihydroxy polydimethylsiloxane, 1-20 parts of titanate catalyst, mixed Joint agent 1-20 parts and tackifier 0-10 parts. Because the patent scheme directly uses α, ω-dihydroxy polydimethylsiloxane as the base polymer, there is a viscosity peak in the production process, and the instantaneous viscosity increases several times, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06
Inventor 李军明朱凯
Owner 西卡(江苏)工业材料有限公司
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