Silicone preparation suitable for the preparation of multilayer composite
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Solution Overview
Problem
Current artificial leather manufacturing using PU or PVC coatings faces issues such as the use of harmful solvents, susceptibility to hydrolysis, poor stain resistance, and hazardous decomposition products, while existing silicone leather solutions do not efficiently achieve mechanical stability, light resistance, and pleasant hand properties.
Innovation Solution
A silicone preparation kit comprising two compositions that undergo transition metal-catalyzed hydrosilylation and condensation reactions upon mixing, forming a cured material with enhanced mechanical and light-resistant properties when heated between 100-200°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PU or PVC coatings are used to manufacture artificial leather, then wear-resistance and soft touch properties are improved, but harmful solvents must be used and hazardous decomposition products are generated
Solution Approach 1:
The patent changes the chemical composition parameters by using silicone polymers instead of PU or PVC, and employs transition metal-catalyzed hydrosilylation reactions to achieve curing without harmful solvents. The use of specific silane components and catalysts enables solvent-free processing while maintaining durability.
Solution Approach 2:
The patent creates a multilayer composite structure with a silicone polymer layer on a substrate. This composite approach combines the advantages of silicone materials (environmental compatibility, durability) with the structural benefits of layered construction, achieving both wear-resistance and elimination of harmful substances.
2Ease of operation
If PU coatings are used for artificial leather, then a soft and pleasant touch is achieved, but the material is prone to hydrolysis and deteriorates when exposed to moisture
Solution Approach 1:
The patent changes the chemical composition from PU to silicone polymers with specific molecular structures that are inherently resistant to hydrolysis. The use of siloxane bonds (Si-O-Si) instead of ester or amide bonds eliminates the hydrolysis vulnerability while maintaining the desired tactile properties through appropriate polymer selection.
3Adaptability or versatility
If PU or PVC coatings are applied to create artificial leather, then the material properties can be adjusted, but complex and costly measures are required to prevent solvent release
Solution Approach 1:
The patent changes the base material to silicone polymers that can be processed without harmful solvents, eliminating the need for complex solvent control infrastructure. The material properties are adjusted through polymer composition and curing parameters rather than solvent selection, simplifying the manufacturing process.
4Object-generated harmful factors
If traditional silicone leather solutions are used, then environmental compatibility is improved, but mechanical stability and light resistance are insufficient
Solution Approach 1:
The patent employs a multilayer composite structure where the silicone polymer layer provides environmental compatibility while the layered construction with specific substrates enhances mechanical stability. The combination of materials in the composite achieves both softness and structural integrity.
Solution Approach 2:
The patent optimizes the silicone polymer parameters including molecular weight, crosslink density, and composition ratios to achieve both environmental compatibility and enhanced mechanical properties. The transition metal-catalyzed curing process allows precise control of these parameters for optimal performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a silicone-based multilayer composite with improved abrasion resistance, bending resistance, light resistance, and pleasant hand feel, addressing the limitations of traditional artificial leather materials.
Implementation Method 1
transition metal-catalyzed hydrosilylation and condensation reactions upon mixing, forming a cured material
Implementation Method 2
a condensation reaction between two silicon-alkoxy groups, a silicon-alkoxy group and a silicon-hydroxyl group, or two silicon-hydroxyl groups which results in the formation of a silicon-oxygen-silicon moiety
Implementation Method 3
when heated between 100-200°C
Data Source
AI summary
The present invention relates to a first kit comprising a composition (a) and a composition (b), wherein composition (a) and composition (b) are spatially separated from each other and composition (a) and composition (b) comprise (A-1) 100-350 parts by weight of a linear organopolysiloxane having terminal alkenyl groups and a molecular weight Mw of 3000 g/mol or more; (A-2) 25-100 parts by weight of an organohydrogenpolysiloxane having 5-300 siloxane repeating units, of which 2-100 repeating unit have Si-H bonds; (A-3) 0-150 parts by weight of hydrophobized silica that optionally has alkenyl groups on its surface; (A-4) 0-40 parts by weight of a linear organopolysiloxane having at least two alkenyl groups per molecule and having a molecular weight Mw of 3000 g/mol or more; (A-5) 0.1-1000 ppm of a hydrosilylation catalyst comprising a transition metal, expressed in terms of the weight of the transition metal relative to the total weight of components (A-1) to (A-4); (B-1) 200-450 parts by weight of a silicone resin containing at least one group -SiR9bY3-b, wherein R9 is a hydrocarbon group having 1-20 carbon atoms, that is optionally substituted with an acryloyl group, a methacryloyl group, or a combination of these; Y is a hydroxyl group or a hydrolysable group selected from halogen and an alkoxy group having 1-3 carbon atoms, b is 0, 1 or 2; (B-2) 25-125 parts by weight of an organic polymer having at least two groups -SiR6aX3-a attached to its polymer backbone, wherein R6 is a hydrocarbon group having 1-20 carbon atoms, X is a hydroxyl group or a hydrolysable group selected from halogen and an alkoxy group having 1-3 carbon atoms, a is 0, 1 or 2, and the polymer backbone is selected from a polyether, polyurethane, polyacrylate poly(meth)acrylate, saturated polyolefin and polyester; (B-3) 0-25 parts by weight of a silane component selected from Si(O-R7)4, (R8)Si(O-R7)3 and a combination of these, wherein R7 is a linear or branched alkyl group having 1-4 carbon atoms and R8 is a linear or branched alkyl group having 1-4 carbon atoms, a linear or branched alkyl group having 1-4 carbon atoms which is substituted with H2C=CH-C(=O)-O- or a linear or branched alkyl group having 1-4 carbon atoms which is substituted with H2C=C(CH3)-C(=O)-O- and; (B-4) 0.5-5 % by weight of a condensation reaction catalyst, relative to the total weight of components (B-1), (B-2) and (B-3); (C) 150-400 parts by weight of a filler; wherein the total amount of components (A-1) to (A-4), (B-1), (B-2) and (B-3) and (C) is 1000 parts by weight and the total weight of components (A-1) to (A-5), (B-1) to (B-4) and (C) is at least 75 % by weight of the total weight of compositions (a) and (b), with the proviso that the following components are not present together in one of composition (a) and composition (b): (A-2) and (A-5); (B-4) and one or more of (B-1), (B-2), (B-3).