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Process of making waterborne large-size and stable silicone rubber suspension and excellent sensory matte coating thereby

A technology of suspension, silicone rubber, applied in the direction of coating, etc., can solve the problem of not providing tactile feeling

Inactive Publication Date: 2019-04-26
DOW CORNING TORAY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Currently commercially available aqueous suspensions of cross-linked silicone particles do not provide an excellent feel and only provide limited matting when used in coatings

Method used

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  • Process of making waterborne large-size and stable silicone rubber suspension and excellent sensory matte coating thereby
  • Process of making waterborne large-size and stable silicone rubber suspension and excellent sensory matte coating thereby
  • Process of making waterborne large-size and stable silicone rubber suspension and excellent sensory matte coating thereby

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0082] [Preparation of water-based coating composition]

[0083] The silicone rubber suspension obtained by the claimed method is mixed with stabilizing additives to form a coating composition. Stabilizers are used to improve the retention and / or distribution of the silicone rubber particles of the present invention in the binder used to hold all components of the composition together when coating a substrate. The coating composition may be 90% by weight polyurethane and 10% by weight silicone rubber particles and stabilizer in the form of a suspension. Mixing can be achieved by operating a dental mixer at 2500 rpm for 1 minute. The presence of stabilizers in excess of 5.0% of the total composition of the coating composition can make the silicone powder highly tacky (sticky), leading to flow and dispersibility problems. In addition, silanes / organosiliconediols, if present, can cause content transfer in the coating formulation, which leads to defects in the final coating.

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Embodiment 1

[0110] 92.2 parts by weight of hydroxyl-terminated polydimethylsiloxane with a viscosity of 80 mPa·s, 3.0 parts by weight of polydimethylsiloxane produced by partial hydrolysis and condensation of tetraethoxysilane by formula (C 2 h 5 O) 12 Si 5 o 4The indicated polyethyl silicate and 4.8 parts by weight of 3-glycidoxypropyltrimethoxysilane were mixed until uniform. The mixture was emulsified in an aqueous solution of 70 parts by weight of pure water and 0.2 parts by weight of polyoxyethylene sodium lauryl sulfate anionic surfactant. The mixture was further emulsified to homogeneity using a colloid mill. A condensation reaction catalyst emulsion was prepared by emulsifying one part by weight of tin(II) octoate in an aqueous solution of 2.0 parts by weight of pure water and 6.8 parts by weight of polyoxyethylene sodium lauryl sulfate anionic surfactant. After the emulsion of the condensation reaction catalyst was added to the emulsion of the crosslinkable silicone composit...

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Abstract

Process of preparing a silicone rubber suspension, comprising following steps: 1) a step of preparing emulsion, comprising the components: a) 100 parts by mass of an organosiloxane with viscosity between 20mPa*s and 1,000 mPa*s at 25 DEG C, having at least two silicone atom-bonded hydroxyl groups in a molecule; b) 3.0 - 10.0 parts by mass of organoalkoxysilane or partially hydrolysate thereof; c)2.0 - 10.0 parts by mass of alkyl silicate; d) 0.001 - 1.5 parts by mass of a surfactant; and e) 50 - 200 parts by mass of water; 2) a step of mixing the emulsion with following components: f) condensation reaction catalyst, g) 1.0 - 30.0 parts by mass of a surfactant; and h) 0 - 10 parts by mass of water.

Description

technical field [0001] The present invention relates to a process for the preparation of silicone rubber suspensions with silicone rubber particles which result in a matting effect and an excellent sensory perception. More specifically, the present invention relates to a method of preparing an aqueous coating composition having a silicone rubber suspension, and a method of reducing gloss and imparting a sensory touch by matting coatings. Background technique [0002] Japanese Laid-Open Patent Application No. Hei 2-113079 (EP365009) discloses the blending of crosslinked silicone particles into a coating composition to prepare a coating composition that forms a matte coating. [0003] Japanese Laid-Open Patent Application No. Hei 5-9409 (US5708057) teaches a method for preparing an aqueous coating composition wherein crosslinked silicone particles are blended into the aqueous coating composition in the form of an aqueous suspension. [0004] Japanese Laid-Open Patent Applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04
CPCC09D183/04C08G77/02C08G77/14C08G77/16C08K5/57C08L83/00C08K5/5415C08G77/18C08L83/04C09D5/00C09D7/69C08G77/08C09D183/06
Inventor 脇田万里B·L·J·勒诺布勒
Owner DOW CORNING TORAY CO LTD