High stability concrete silicone joint glue and preparation method thereof

Abstract

The invention discloses a high-stability concrete silicone joint glue and a preparation method thereof. The joint glue consists of 100 parts by mass of α,ω-dihydroxy polydimethylsiloxane, 50-150 parts of filler 0.5-10 parts of thixotropic agent, 0.5-10 parts of chain extender, 5-15 parts of curing agent, 0.1-5 parts of tackifier, 0.01-3 parts of catalyst, 1-10 parts of liquid nitrile rubber, First, α, ω-dihydroxy polydimethylsiloxane, thixotropic agent and filler are made into a base material in a kneader, and then the base material is transferred into a high-speed disperser, and the remaining raw materials are added to react to obtain the base material. seam glue. The invention uses liquid nitrile rubber modified silicone joint adhesive, and adopts a specific chain extender to endow the joint adhesive with permanent toughness and mechanical property retention, and the plasticizer does not migrate, does not damage the bonding, and greatly improves Improve the bonding strength, excellent aging resistance, environmental protection and pollution-free.

Description

Technical field [0001] The embodiment of the present invention relates to the field of polymer materials. More specifically, the embodiment of the present invention relates to a high-stability concrete silicone joint glue and a preparation method thereof. Background technique [0002] In recent years, the frequent occurrence of global resource and environmental crises has made people pay more and more attention to resource conservation and environmental protection. With the low-carbon economy beginning to become the world's mainstream economic development mode, my country can no longer seek economic leapfrog development at the expense of the environment. As one of the industries with high energy consumption and high pollution, my country's construction industry must follow the path of sustainable development, and the development of industrialized buildings is imminent. [0003] As a joint product between traditional buildings and industrialized buildings, it has a decisive effect ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing silicone joint adhesives have considerable defects: 1. In order to reduce costs or increase construction performance, a large amount of plasticizers (such as white oil, low-viscosity methyl silicone oil, etc.) are often added to the joint adhesives. , resulting in the comprehensive performance of the joint adhesive not meeting the requirements for use

2. The "oil" contained in the silicone sealant is easy to dissociate to the dust adhered to the surface of the colloid due to static electricity, and the dust will spread to the surrounding of the bonding surface with the rain and wind

Since concrete is a porous material, it is very easy to be polluted, resulting in banded pollution around the joints of the concrete slab, which affects the appearance

3. The high-elongation and low-modulus joint adhesive will increase in modulus, decrease in plasticity, and decrease in elongation at break with time in the later period of use.

This is because over time, the cross-linking reaction in the joint adhesive system is becoming more and more perfect, resulting in an increase in cross-linking density, so that the seam adhesive loses the characteristics of high elongation and low modulus during service.

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