TPV (thermoplastic vulcanizate) sealing material, preparation method and application of TPV sealing material in automobile engine

By introducing polystyrene-based cashew phenol as a compatibilizer into TPV materials, the compatibility between silicone rubber and polyurethane is enhanced, solving the problem of poor compatibility between silicone rubber and polyurethane, and improving the mechanical properties of the material, especially tensile strength and tear strength, making it suitable for automotive engine sealing materials.

CN120865716AActive Publication Date: 2025-10-31GUANGZHOU SUPTECH MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511383920.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-26
Publication Date
2025-10-31
Estimated Expiration
2045-09-26

AI Technical Summary

Technical Problem

The poor compatibility between silicone rubber and polyurethane results in poor mechanical properties of TPV materials, particularly low tensile strength, elongation at break, and tear strength.

Method used

Polystyrene-based cashew phenol is used as a compatibilizer. Through the co-vulcanization reaction of it with silicone rubber masterbatch, polyurethane elastomer, vulcanizing agent and platinum catalyst, the compatibility between silicone rubber and polyurethane is enhanced. The aliphatic carbon chain of styrene-based cashew phenol is used to crosslink with hydrogen-containing silicone oil to improve the bonding strength. The compatibility with polyurethane is also improved through the urethane group.

Benefits of technology

It significantly improves the tensile strength, elongation at break, and tear strength of TPV sealing materials, meeting the practical application requirements of automotive engine sealing materials.

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Abstract

The invention relates to the technical field of TPV (thermoplastic vulcanizates), and discloses a TPV sealing material, a preparation method and application of the TPV sealing material in automobile engines, the TPV sealing material comprises 45-60 parts by weight of silicone rubber masterbatch, 40-55 parts by weight of polyurethane elastomer, 4-10 parts by weight of polystyrene cardanol, 0.18-0.3 part by weight of platinum catalyst and the like; a fat carbon chain of polystyrene-based cardanol contains alkenyl, hydrogen-containing silicone oil and methyl vinyl silicone rubber are subjected to a cross-linking reaction, meanwhile, polystyrene-based cardanol contains a carbamic acid ester group, the compatibility with a polyurethane elastomer is also good, the compatibility between silicone rubber and the polyurethane elastomer is improved, and the compatibility between the silicone rubber and the polyurethane elastomer is improved. The polystyrene-based cardanol contains a polystyrene molecular chain with high strength, and meanwhile, a fat carbon chain can play a role in toughening polyurethane, so that the tensile strength, the elongation at break and the tearing strength of the TPV sealing material are improved.
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