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Method for preparing high storage stability room temperature dehydration sulfureted organic silicon coat

A storage stability, silicone technology, applied in chemical instruments and methods, anti-fouling/underwater coatings, coatings, etc., can solve problems such as long-term, unsatisfactory performance of silicone rubber, and decline in mechanical properties of products, and achieve the goal of using Convenience, improved storage stability, and easy-to-clean effects

Active Publication Date: 2008-09-10
CHENGDU GUIBAO NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polysilicone water system can be dehydrated within one to two weeks after preparation to obtain practical silicone rubber. However, once the polysilicone water system is stored for a long time, the performance of the dehydrated silicone rubber is not ideal, and it needs to be re-treated. Add catalyst and cross-linking agent, therefore, in order to obtain a storage-stable polysilicone water system, it must be formulated as a two-component
[0004] Chinese patent CN 1,035,311 discloses a method for preparing a polysilicone aqueous dispersion that can be dehydrated and cross-linked to an elastomer, using an anionic or nonionic surfactant stabilized α, ω ~ (dihydroxy) polydiorganosiloxane Polymer emulsion is used as the base polymer, organosilicone salt is used as the crosslinking agent, and inorganic substances such as calcium carbonate are used as fillers. The prepared product can still be dehydrated and crosslinked after being stored at 20°C for 7 months. However, after 7 months , the product tensile strength and elongation at break have a certain degree of decline
[0006] (1) The storage period of a single component is not long, so it must be formulated into two components,
[0007] (2) After the preparation of the single-component product is completed, if no catalyst is added, the product cannot be dehydrated and cross-linked, or it will take a long time; if a catalyst is added, the catalyst, cross-linking agent, and base polymer are in the same system. After a period of time, the mechanical properties of the product will decline

Method used

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  • Method for preparing high storage stability room temperature dehydration sulfureted organic silicon coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 100 parts of α, ω ~ (dihydroxy) polydiorganosiloxane polymer anionic emulsion, 2 parts of γ-methacryloxypropyl trimethoxysilane, and 0.5 parts of catalyst stannous octoate emulsion into the mixer and mix evenly , matured at room temperature for 1 day, adjusted the pH value of the above composition to 12 with ethylamine, added the above composition, 75 parts of inorganic filler calcium carbonate, 0.5 part of DSX3116 and 0.2 part of Foamaster-75 into a planetary mixer and stirred evenly to obtain a high storage capacity Stability room temperature dehydration vulcanization silicone coating, sample preparation according to the standard GB / T528-92, the mechanical properties were measured after 14 days, and the mechanical properties measured after the sample was stored for 12 months are shown in Table 1.

Embodiment 2

[0030] Add 100 parts of α, ω ~ (dihydroxy) polydiorganosiloxane polymer anionic emulsion, 4 parts of vinyltrimethoxysilane, and 1 part of catalyst stannous octoate emulsion into a mixer and mix evenly, and ripen at room temperature for 3 days. Ethylenediamine adjusted the pH value of the above composition to 10, and added the above composition together with 85 parts of calcium carbonate, 1 part of magnesium hydroxide, 0.5 part of DSX3116 and 0.2 part of Foamaster-75 into a planetary mixer and stirred evenly to obtain high storage stability The room temperature dehydration vulcanization silicone coating film was prepared according to the standard GB / T528-92. The mechanical properties were measured after 14 days, and the mechanical properties of the samples were measured after 12 months of storage. See Table 1 for details.

Embodiment 3

[0032] Add 100 parts of α, ω~(dihydroxy)polydiorganosiloxane polymer anionic emulsion, 3 parts of vinyltrimethoxysilane, 2 parts of catalyst stannous octoate emulsion into the mixer and mix evenly, ripen at room temperature for 3 days, use Ethylenediamine adjusted the pH value of the above composition to 11, and added the above composition together with 85 parts of calcium carbonate, 1 part of magnesium hydroxide, 0.5 part of DSX3116 and 0.2 part of Foamaster-75 into a planetary mixer and stirred evenly to obtain high storage stability The room temperature dehydration vulcanization silicone coating film was prepared according to the standard GB / T528-92. The mechanical properties were measured after 14 days, and the mechanical properties of the samples were measured after 12 months of storage. See Table 1 for details.

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Abstract

The invention discloses a preparation method for high storage stability room temperature dehydration curing silicone coating and is characterized in that the method comprises the following steps (the raw materials are expressed according to the weight proportion): alpha, omega-(dihydroxy)polydiorganosiloxane polymer anion emulsion 100 portions, silicone cross-linking agent 1-5 portions, and catalyst stannous octoate emulsion 0.1-5 portions are added into a stirrer to evenly mix and then cured for 1 to 4 days at room temperature, alkali is used to adjust the pH value of the compound to 10 to 14, and the compound, inorganic filler 50-100 portions, thickening agent 0.1-1 portion and defoaming agent 0.1-1 portion are added into a planetary stirring machine to evenly stir so as to obtain the high storage stability room temperature dehydration curing silicone coating.

Description

technical field [0001] The invention relates to a high-storage-stable room-temperature dehydration vulcanization organic silicon coating film and a preparation method thereof, belonging to the field of polymer sealing materials and preparation thereof. Background technique [0002] As early as 1959, US Patent No. 2,891,920 disclosed a method for emulsion polymerization of polydiorganosiloxane in the presence of a surfactant and dehydration of the emulsion to form a film, which can be used to prepare a protective film. The author Hyde believes that in order to make the emulsion have sufficient strength to achieve the purpose of use after dehydration and cross-linking to form a film under environmental conditions, the molecular weight of polydiorganosiloxane must reach a relatively high value, and here ultrahigh Under molecular weight conditions, the emulsion is extremely unstable. Hyde pointed out that to prepare a stable polydiorganosiloxane emulsion, an acid catalyst is pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/14C09D5/16C08G77/08C08G77/392C09K3/10
Inventor 邱泽皓袁素兰王有治王楠
Owner CHENGDU GUIBAO NEW MATERIAL
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