Method for preparing transparent dealcoholized single-component room temperature vulcanized silicone rubber
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A technology of room temperature vulcanization and dealcoholization, which is applied in the direction of chemical instruments and methods, adhesives, and other chemical processes. Improves storage stability and prevents gelation of the rubber compound
Active Publication Date: 2011-08-10
GUANGZHOU GLORYSTAR CHEM +1
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[0004] Using existing titanates and their complexes as catalysts, there are mainly problems such as easy gelation, poor storage stability, and yellowing of rubber materials during production and use.
The patent application No. 200810236984.8 discloses a preparation method of a one-component dealcoholized silicone sealant, which has good adhesion resistance and "double-85" resistance. The filler used is nano-calcium carbonate, which is not transparent. sex
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preparation example Construction
[0068] The preparation method of the transparent dealcoholized one-component RTV silicone rubber of the present invention comprises the following steps:
[0069] 1. Prepare the composition raw material formula of the following weight percentage
[0070] (a) 80% to 90% α, ω-dihydroxy polydimethylsiloxane;
[0071] (b) 1% to 15% white carbon black reinforcing filler;
[0072] (c) 1% to 5% siloxane crosslinking agent;
[0073] (d) 0.01%~2% TiOSi catalyst;
[0074] (e) 0.01% to 3% organic tin catalyst;
[0075] (f) 5% to 10% alkane mixture plasticizer;
[0076] (g) 0.01%~5% silane coupling agent;
[0077] Among them, the molecular weight of α, ω-dihydroxy polydimethylsiloxane is between 3000-100000g / mol, and the dynamic viscosity is 10000-100000Pa·s; the reinforcing filler is white carbon black with different specific surface areas; siloxane crosslinking The general formula of the agent is: R 1 4-n Si(OR 2 ) n (0≤n≤4), where R 1 is a linear or branched saturated or unsatu...
Embodiment 1
[0082] 1) α, ω-Dihydroxypolydimethylsiloxane 84%;
[0083] 2) White carbon black reinforcing filler 10%;
[0084] 3) 3% siloxane compound;
[0085] 4) TiOSi 0.1%;
[0086] 5) Organic tin catalyst 0.04%;
[0087] 6) alkane mixture plasticizer 2.7%;
[0088] 7) Silane coupling agent 0.16%.
Embodiment 2
[0090] 1) α, ω-Dihydroxypolydimethylsiloxane 78%;
[0091] 2) White carbon black reinforcing filler 14%;
[0092] 3) 3% siloxane compound;
[0093] 4) TiOSi 0.1%;
[0094] 5) Organic tin catalyst 0.04%;
[0095] 6) 4.7% of alkane mixture plasticizer;
[0096] 7) Silane coupling agent 0.16%.
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Abstract
The invention discloses a method for preparing transparent dealcoholized single-component room temperature vulcanized silicone rubber. The method is characterized by comprising the steps of mixing 80-90% of alpha, omega-dihydroxydimethylpolysiloxane, 1-15% of white carbon black reinforcing filler and 5-10% of alkane mixture plasticizer in a blender in a vacuum state at a room temperature; and then adding 1-5% of siloxane crosslinking agent to be mixed in a vacuum state; adding 0.01-2% of siloxane titanate TiOSi catalyst, 0.01-3% of organic tin catalyst and 0.01-5% of silane coupling agent to be mixed in a vacuum state; and discharging out and packaging. Through the method disclosed by the invention, rubbers can be effectively prevented from yellowing on the basis of keeping the catalytic efficiency, and the problem of short storage life of the rubber can be effectively solved.
Description
technical field [0001] The invention relates to the technical field of one-component silicone sealant, in particular to a preparation method of transparent dealcoholized one-component room temperature vulcanized silicone rubber. Background technique [0002] With the rapid development of the national economy, the demand for silicone sealants in construction and other industries is increasing, and the requirements for the performance of silicone sealant products are also getting higher and higher. This has brought opportunities and challenges to the development of silicone sealants, and the development of silicone sealants with low cost and excellent performance has attracted more and more attention. [0003] As far as the one-component transparent dealcoholized silicone sealant is concerned, internationally renowned companies such as Dow Corning in the United States and Wacker in Germany are at the forefront. For example, Wacker alcohol type rubber has good anti-yellowing p...
Claims
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