Water-blocking sealant and preparation method thereof

Abstract

The invention relates to the technical field of sealants, in particular to a water-blocking sealant and a preparation method thereof. The water-blocking sealant comprises the following raw materials in parts by mass: 50-60 parts of water-absorbent resin, 10-30 parts of polyvinyl alcohol, 20-30 parts of diphenylmethane diisocyanate, 20-30 parts of phthalic anhydride polyester polyol, 20-30 parts of acetone, 8-12 parts of ethylene propylene diene monomer, 5-10 parts of a water swelling agent, 3-9 parts of a cross-linking agent, 1-2 parts of a chain extender, 0.5-2 parts of a surfactant, 1-2 parts of an antioxidant and 0.3-1 part of a vulcanizing agent. Polyurethane is prepared from diphenylmethane diisocyanate and phthalic anhydride polyester polyol. The polyurethane, the water-absorbent resin and the ethylene propylene diene monomer are compounded to prepare the water-blocking sealant, the polyurethane adheres, the ethylene propylene diene monomer is elastic rubber and elastically extrudes, seals and blocks water, the water-absorbent resin absorbs water and expands to block water, namely, good adhesion performance is achieved in different substrate surfaces or gaps, the disclosed sealant has wide substrate adhesion applicability and water-absorbing expansion water-blocking performance, and has a good water-blocking effect when being used in the substrate gaps.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a water-blocking sealant and a preparation method thereof. Background technique [0002] Sealants are widely used in modern industries, such as building exterior walls, auto parts, home decoration, and even joints of parts in aerospace and navigation. Sealants need good adhesion, mechanical properties etc. [0003] However, pipe joints, building exterior walls, glass and wall joints, submarine optical fiber layers and interlayers and joints, etc., require sealants to have good water resistance. Existing waterproof sealants mostly use surface hydrophobic functional groups for waterproofing, long-chain polymers for water resistance, or micro-nano structures on the surface of the sealant for hydrophobicity. The sealant has a better waterproof effect on the overall surface of the rubber surface. However, it is often necessary to apply a large amount of sealant at the joint of the ...

AI Technical Summary

Problems solved by technology

However, it is often necessary to apply a large amount of sealant at the joint of the gap, relying on the thickness of the sealant and the distance between the edge of the sealant and the gap to block water, and the waterproof effect is poor

In addition, when soaked in water for a long time, water can penetrate the gap between the sealant and the base material, and the gap between the base material will still seep water, and the connection strength of the sealant will also decrease.

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