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Organic silicon releasing coating mixture used in coating method with high solid content resolvent

A technology of anti-adhesive coatings and mixtures, which is applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., and can solve problems such as unsatisfactory consumers and poor wetting properties of coating films

Active Publication Date: 2009-09-16
DOW CORNING CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, this solvent-free coating mixture did not fully satisfy consumers because the vinyl-terminated polysiloxane used in this product is not a long-chain structure and will easily penetrate into the substrate (such as paper) and paint. Layer films show poor wetting properties

Method used

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  • Organic silicon releasing coating mixture used in coating method with high solid content resolvent
  • Organic silicon releasing coating mixture used in coating method with high solid content resolvent
  • Organic silicon releasing coating mixture used in coating method with high solid content resolvent

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Embodiment

[0195] Examples and comparisons are given below to specifically describe the present invention. However, the present invention is not limited to the following examples. In the following examples and comparisons, parts are parts by weight and ppm means ppm by weight in each case. Viscosity, silicone coating curing speed, peeling force, residual adhesion ratio (SAS%), and coating weight were measured at 25° C. by the following methods.

[0196] 〔Viscosity〕

[0197] The viscosity of the organopolysiloxane and silicone release coating mixture was determined by using a Brookfield viscometer (Brookfield viscometer) (Model: LVF, with spindle #1, 2, 3, 4, and speed 6 to 60 rpm) at Measured at 25°C.

[0198] 〔Silicone coating〕

[0199] The silicone anti-stick coating mixture is coated on PE kraft paper (PE coater) by a knife coater (Euclid Lab Coater, model: #E BC12M1), i.e. a "squeegee". film) to provide the coat weights described in the table below, and then cured under the cond...

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PUM

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Abstract

The invention relates to an organic silicon releasing coating mixture, a releasing coating base material and a method for producing the releasing coating base material. The organic silicon releasing coating mixture comprises: (A) a mixture of poly di-organic-group siloxane (a1) and poly di-organic-group siloxane (a2) with a proportion of 10:90 to 70:30, (B) organic hydrogen polysiloxane of which each molecule has more than two hydrogen atoms connected with silicon on the average, (C) a catalyst in a hydrosilylation reaction and (D) an inhibitor with 0.001-2.0 parts by weight in the hydrosilylation reaction, wherein each molecule of the poly di-organic-group siloxane (a1) has at least two alkenyls on the average, and the viscosity of (a1) at the temperature of 25 DEG C is 100-500mPas; eachmolecule of the poly di-organic-group siloxane (a2) has at least two alkenyls on the average, and the viscosity of (a2) at the temperature of 25 DEG C is 5,000mPas; and the organic hydrogen polysiloxane has a content large enough to ensure that molar ratio of the hydrogen atoms connected with the silicon in the organic hydrogen polysiloxane and the alkenyls in the component (A) ranges from 0.8:1 to 5:1.

Description

technical field [0001] The present invention relates to silicone release coating mixtures for use in high solids solvent coating processes capable of forming cured release coatings on substrates such as paper, polyolefin coated paper, thermoplastic resin films, metal foils, etc. Coating; can provide excellent anti-adhesive properties, fast curing speed, good wetting properties and fastness to the substrate. When coating the silicone release coating mixture, a high solid content solution type coating liquid is used. Suitable coating methods can be performed by gravure screen roll coating (direct coating or reverse coating) method, offset gravure three-roll or multi-roll coating method. The present invention is very cost-effective and uses less solvent than conventional solvent-based products, thus contributing to environmental protection. The invention also relates to a sheet-form substrate with a release coating produced by curing the mixture. Background technique [0002...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/14C09D5/00C09D7/12B05D5/08
Inventor 郭中冕周彦R·A·艾克兰德
Owner DOW CORNING CORP
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