Single-component polyurethane sealant and preparation method thereof

Abstract

The invention discloses a single-component polyurethane sealant which is composed of the following components by weight percentage: 41.05% of high-elasticity polymer, 23.45% of calcium carbonate, 5% of titanium dioxide, 28% of forming agent, 2% of dimethylbenzene and 0.5% of moisture scavenger, wherein the high-elasticity polymer is composed of the following components by weight percentage: 7.31% of dimethylbenzene, 7.31% of isocyanate, 85.26% of polyether polyol and 0.12% of moisture scavenger, and the forming agent is composed of the following components by weight percentage: 53.57% of isocyanate, 17.85% of diamine and 28.58% of coupling agent. A preparation method of the single-component polyurethane sealant comprises the following steps of: with a vacuum stirring tank capable of being cooled as a stirrer, adding 41.05% of high-elasticity polymer at first, and then adding 23.45% of calcium carbonate, 5% of titanium dioxide, 28% of forming agent and 2% of dimethylbenzene, stirring until 60 DEG C, and then adding 0.5% of moisture scavenger, and stirring evenly, thereby obtaining the single-component polyurethane sealant, and finally packaging the single-component polyurethane sealant. The single-component polyurethane sealant has the advantage that the self-made forming agent and the polymerization elastomer as well as special moisture removal material are employed so that the caking property, sagging resistance, elasticity and stability of the single-component polyurethane sealant can meet a higher standard.

Description

technical field [0001] The invention relates to a sealant, in particular to a one-component polyurethane sealant, which is applied to the sealing fields of wood, metal, metal primer and topcoat, ceramic materials and plastics. Background technique [0002] Polyurethane sealant has the following characteristics: excellent wear resistance; low temperature softness; wide range of performance adjustment; high mechanical strength; good adhesion; good elasticity, excellent recovery, suitable for dynamic joints; weather resistance Good, the service life can reach 15-20 years; excellent oil resistance; biological aging resistance; moderate price. Polyurethane sealants also have some disadvantages. Such as: not long-term heat resistance; light-colored formulas are susceptible to UV aging; the storage stability of one-component adhesives is greatly affected by packaging and the outside world, and usually cures slowly; bubbles and cracks may occur in high-temperature thermal environme...

AI Technical Summary

Problems solved by technology

Such as: not long-term heat resistance; light-colored formulas are susceptible to UV aging; the storage stability of one-component adhesives is greatly affected by packaging and the outside world, and usually cures slowly; bubbles and cracks may occur in high-temperature thermal environments; painted

At the same time, the water resistance of polyurethane sealant is also poor, especially the alkali water resistance is not good.