Soft-hard co-extrusion composite silicone rubber strip

A composite silicone rubber, soft and hard co-extrusion technology, applied in the field of building sealing strips, can solve the problems of poor weather resistance and anti-aging performance, low compression ratio of sealing parts, narrow operating temperature range, etc., to achieve increased adhesion, Reduce secondary processing and improve sealing performance

Active Publication Date: 2015-09-09
浙江凌志新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the EPDM strip has the following inherent defects: the strip is easy to break, has poor extrusion resistance, poor weather resistance and aging resistance; the product has an odor, the use temperature range is narrow, and the color is single; the plasticizer used It is naphthenic oil, which will migrate to the surface with the prolongation of use time, leading to the failure of the sealant of energy-saving door and window insulating glass or curtain wall
[0004] The existing ordinary silicone rubber strips are integrally formed with uniform material and hardness. The defects during installation are: the installation part of the silicone rubber strip has low hardness and is difficult to install, the sealing part has low compression ratio, poor elasticity, and rebounds. Slow, poor sealing performance

Method used

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  • Soft-hard co-extrusion composite silicone rubber strip
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  • Soft-hard co-extrusion composite silicone rubber strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A soft and hard co-extruded composite silicon rubber rubber strip, which is composed of dense mixed rubber film 1 and foamed mixed rubber film 2 (for a specific structure, please refer to the attached figure 1 ), specifically include the following steps:

[0042] 1) Preparation of dense mixed rubber film:

[0043] 100 parts by weight of methyl vinyl silicone rubber (molecular weight of 500,000 to 700,000, vinyl molar content of 0.22 to 1%), 80 parts by weight of filler (fumed silica), 6 parts by weight of structure control agent (methoxy end-capped polydimethylsilicone oil), 1 weight part of tackifier into the kneader, kneaded at 100 ° C, vacuum degree -0.06MPa for 4 hours, cooled to room temperature, and obtained a dense compound rubber; 100 parts by weight of dense Mixed rubber, 0.5 parts by weight of color masterbatch and 1 part by weight of vulcanizing agent (benzoyl peroxide) were thinly passed 3 times on an open mill to obtain a dense mixed rubber film with a thi...

Embodiment 2

[0050] A soft and hard co-extruded composite silicon rubber rubber strip is formed by compounding a compact mixed rubber film and a foamed mixed rubber film, and specifically includes the following steps:

[0051] 1) Preparation of dense mixed rubber film:

[0052] 100 parts by weight of methyl vinyl silicone rubber (molecular weight of 500,000 to 700,000, vinyl molar content of 0.22 to 1%), 170 parts by weight of filler (100 parts of fumed white carbon black + 70 parts of kaolin), 10 parts by weight of structural Add the control agent (methoxy-terminated polydimethylsilicone oil) and 5 parts by weight of the tackifier into the kneader, knead at 180°C for 0.5 hours under a vacuum degree of -0.10MPa, and cool to room temperature to obtain a dense mixed rubber ; 100 parts by weight of compact rubber compound, 1.5 parts by weight of color masterbatch and 3 parts by weight of vulcanizing agent (1.5 parts of benzoyl peroxide+1.5 parts of dicumyl peroxide) are thinly passed 5 times ...

Embodiment 3

[0059] A soft and hard co-extruded composite silicon rubber rubber strip is formed by compounding a compact mixed rubber film and a foamed mixed rubber film, and specifically includes the following steps:

[0060] 1) Preparation of dense mixed rubber film:

[0061] 100 parts by weight of methyl vinyl silicone rubber (molecular weight of 500,000 to 700,000, vinyl molar content of 0.22 to 1%), 120 parts by weight of filler (precipitated silica), 8 parts by weight of structure control agent (methoxy End-blocked polydimethylsilicone oil), 3 parts by weight of tackifier were added to the kneader, kneaded for 2 hours at 120°C, vacuum degree -0.08MPa, and cooled to room temperature to obtain a dense compound rubber; 100 parts by weight of dense Mixed rubber, 1 weight part of color masterbatch and 2 weight parts of vulcanizing agent (dicumyl peroxide) were thinly passed 4 times on the open mill to obtain a dense mixed rubber film with a thickness of 7 mm.

[0062] 2) Foamed mixed rub...

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Abstract

The invention discloses a soft-hard co-extrusion composite silicone rubber strip, the composite silicone rubber strip is composited by dense mixed stock film and foaming mixed stock film; the dense mixed stock film comprises the following components by weight part: 100 parts of dense mixed stock, 1-3 parts of vulcanizing agent and 0.5-1.5 parts of masterbatch; the foaming mixed stock film comprises the following components by weight part: 100 parts of foaming mixed stock, 2-5 parts of vulcanizing agent, 1-3 parts of masterbatch and 1-4 parts of foaming agent. The installation part of the soft-hard co-extrusion composite silicone rubber strip is dense glue with high hardness and fixed size, fixing is convenient, and installation is easy, the sealing part is foaming glue with good elasticity and rapid rebound performance, and has advantages of high compression ratio and good sealing performance, and sealing performance of door and window can be increased.

Description

technical field [0001] The invention relates to a building sealing strip, in particular to a soft and hard co-extruded composite silicone rubber strip. Background technique [0002] Sealing strips for building doors and windows are often limited by installation location, service life, sealing requirements, profile fit, etc., and materials such as rubber, EPDM rubber, silicone rubber, and composite strips of various materials are often used. At present, EPDM and PVC sealing strips are mainly used in China, while silicone rubber and EPDM sealing strips are commonly used abroad. Because PVC becomes hard and brittle with time, loses elasticity, is not resistant to aging, has poor weather resistance and low temperature properties, and does not meet the performance requirements of sealing strips, it has been gradually eliminated by the market. As a sealing material with better performance, ethylene-propylene-diene monomer (EPDM) is widely used at present. However, the EPDM strip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K5/14C08G77/20C08J9/08C08J9/10B29C35/02
Inventor 陈世龙张宝华汪金花张春晖王香娣
Owner 浙江凌志新材料有限公司
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