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Low-modulus high-elongation and high-thixotropy ageing-resistant sealant and preparation method thereof

A technology with high elongation and thixotropy, applied in the field of sealants, can solve the problems of high thixotropy, aging resistance, high cost, poor concrete adhesion, etc., and achieve non-deteriorating durability, excellent high deformation performance, and superior durability Effect

Inactive Publication Date: 2019-02-22
广东菊兰新型材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although asphalt is cheap and easy to obtain, it has poor adhesion to concrete, poor elasticity, easy to flow at high temperature, easy to be brittle at low temperature, not resistant to aging, and has a short service life (about 2 years). The sealing coatings for the gaps and expansion joints of concrete pavement such as bridges, highways, and airport runways do not have the functions of low modulus, high elongation, high thixotropy and aging resistance, resulting in high cost and short service life, which brings inconvenience to people.

Method used

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  • Low-modulus high-elongation and high-thixotropy ageing-resistant sealant and preparation method thereof
  • Low-modulus high-elongation and high-thixotropy ageing-resistant sealant and preparation method thereof

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preparation example Construction

[0022] The invention provides a sealant with low modulus, high elongation, high thixotropy and aging resistance and a preparation method thereof, comprising silicone rubber, filler, reinforcing agent, crosslinking agent, catalyst, plasticizer, chain extender, Vulcanization accelerators, pigments, thixotropic agents, tackifiers, stabilizers, heat-resistant agents and antifungal agents, the mass fraction of silicone rubber is 15-20, the mass fraction of fillers is 10-13, and the mass fraction of reinforcing agents The mass fraction is 7-8, the mass fraction of crosslinking agent is 5-7, the mass fraction of catalyst is 6-8, the mass fraction of plasticizer is 5-7, the mass fraction of chain extender is 2-3, vulcanization The mass fraction of the accelerator is 1-3, the mass fraction of the pigment is 1-2, the mass fraction of the thixotropic agent is 3-6, the mass fraction of the tackifier is 4-5, and the mass fraction of the stabilizer is 3-4 , the mass fraction of the heat-res...

Embodiment 1

[0031] Recipe and its proportions:

[0032] The mass fraction of silicone rubber is 15, the mass fraction of filler is 10, the mass fraction of reinforcing agent is 7, the mass fraction of crosslinking agent is 5, the mass fraction of catalyst is 6, and the mass fraction of plasticizer is 5 , the mass fraction of the chain extender is 2, the mass fraction of the vulcanization accelerator is 1, the mass fraction of the pigment is 1, the mass fraction of the thixotropic agent is 3, the mass fraction of the tackifier is 4, and the mass fraction of the stabilizer is 3. The mass fraction of the heat-resistant agent is 5 and the mass fraction of the fungicide is 4; its preparation method:

[0033] Step 1: Put the silicone rubber, filler, reinforcing agent and cross-linking agent into the double planetary stirring tank according to the measurement, stir for 1 hour and evacuate;

[0034] Step 2: Add metered catalyst, plasticizer, chain extender, vulcanization accelerator, pigment, th...

Embodiment 2

[0040] Recipe and its proportions:

[0041] The mass fraction of silicone rubber is 18, the mass fraction of filler is 11, the mass fraction of reinforcing agent is 7.5, the mass fraction of crosslinking agent is 6, the mass fraction of catalyst is 7, and the mass fraction of plasticizer is 6 , the mass fraction of the chain extender is 2.5, the mass fraction of the vulcanization accelerator is 2, the mass fraction of the pigment is 1.5, the mass fraction of the thixotropic agent is 4, the mass fraction of the tackifier is 4.5, and the mass fraction of the stabilizer is 3.5, the mass fraction of the heat-resistant agent is 6 and the mass fraction of the fungicide is 5; its preparation method:

[0042] Step 1: Put the silicone rubber, filler, reinforcing agent and cross-linking agent into the double planetary stirring tank according to the measurement, stir for 1 hour and evacuate;

[0043] Step 2: Add metered catalyst, plasticizer, chain extender, vulcanization accelerator, p...

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Abstract

The invention discloses a low-modulus high-elongation and high-thixotropy ageing-resistant sealant and a preparation method thereof. The sealant contains silicone rubber, a filler, a reinforcing agent, a cross-linking agent, a catalyst, a plasticizer, a chain extender, a vulcanization accelerator, a pigment, a thixotropic agent, a tackifier, a stabilizer, a heat-resistant agent and a mildew preventive. The sealant has the characteristics of low modulus, high elasticity, excellent adhesive power and low-stress high elongation, is particularly applicable to special engineering requirements on joints such as caulked joints of long-span deformed displacement expansion joints of high-rise buildings and large-sized concrete facilities and has excellent adhesive property, low-stress high deformation property, high and low temperature resistances, water resistance, ageing resistance and the like; and when the sealant is used for sealing caulked joints of break joints and expansion joints of concrete pavements such as highways, bridges, expressways and airfield runways, the sealant needs to have excellent durability, namely that the sealant does not crack, embrittle and deteriorate within 30 years.

Description

technical field [0001] The invention relates to a sealant, in particular to a sealant with low modulus, high elongation, high thixotropy and aging resistance and a preparation method. Background technique [0002] With the rapid development of the national economy, my country's highway transportation industry has become more and more developed, and the annual increase in highway mileage is about 80,000km. In order to adapt to expansion and bending caused by external factors (such as temperature changes), concrete panels such as tunnels, bridges, roads, airport runways, squares, etc. are designed with expansion joints. Sealed expansion joints are the weak link in the concrete slab structure. If the joints are not well sealed, it is easy for foreign matter to accumulate in the gaps, hindering the normal expansion of the joints; in addition, it will also cause water seepage, softening and erosion of the joints Foundations, which allow plates to settle or break. So the seams m...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/04C09J11/06C09J11/08
CPCC08K2003/265C08L2201/08C08L2205/025C09J11/04C09J11/06C09J11/08C09J183/04C08K13/06C08K3/26C08K9/06C08K3/36
Inventor 李刚姚跃凯胡甲科何柏青何培勇龙翔
Owner 广东菊兰新型材料科技有限公司
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