Method for preparing organosilicon modified acrylic ester binding agent

Abstract

The invention relates to a method for preparing a silicone-modified acrylate adhesive, which comprises the following: (1) a step of the pre-polymerization of a modified monomer, in which the modified monomer, a modified monomer catalyst, an emulsifying agent and deionized water are pre-polymerized to obtain a silicone pre-polymerization emulsion; (2) a step of emulsification, in which the silicone pre-polymerization emulsion and a basic monomer are emulsified to obtain an intermediate pre-emulsion; and (3) a step of the polymerization of acrylic ester, in which the intermediate pre-emulsion is polymerized with a basic monomer catalyst and the deionized water to obtain a finished product. The method adopts a fractional step method to emulsify according to the hydrophilicity of various monomers. During the emulsification step by step, a polymeric monomer with stronger hydrophobicity which is added first can be effectively and steadily dispersed under the condition of relatively higher concentration of the emulsifying agent, which strengths the stability of a monomer pre-emulsion. The grain diameter of the prepared adhesive emulsion is smaller and has narrower distribution, the emulsion system is also more stable, and various application performances are superior to those of adhesive products prepared by the prior method.

Description

technical field [0001] The invention relates to acrylate adhesives used in textile paint printing, paint dyeing, electrostatic flocking and finishing, and in particular to organosilicon-modified acrylate adhesives, especially organosilicon-modified acrylate adhesives method of preparation. Background technique [0002] Silicone-modified acrylate adhesives are widely used in paint printing, paint dyeing, electrostatic flocking, stiffening and finishing of various textiles. Silicone-modified acrylate adhesives are generally prepared by acrylate (ester) monomers through acrylate seed emulsion polymerization. [0003] The above-mentioned raw materials include basic monomers, modified monomers and auxiliary agents, wherein: basic monomers include hard monomers, soft monomers, and crosslinking monomers; modified monomers are silane monomers or coupling agents; auxiliary agents It is modified monomer catalyst, basic monomer catalyst, emulsifier, deionized water, etc. [0004] Th...

AI Technical Summary

Problems solved by technology

[0008] The preparation methods of the above-mentioned organosilicon-modified acrylate adhesives all adopt the method of directly putting the raw materials into the reaction kettle to obtain the acrylate adhesive through the method of polymerization. Emulsification, due to the differences in the hydrophilicity of various monomers, some monomers with strong hydrophobicity cannot be stably dispersed under the condition of relatively high emulsifier concentration, and the stability of the emulsion is poor; 2. Modified monomers The body only uses one of the silane monomers or coupling agents to modify the acrylate, and the weather resistance, emulsion stability, mechanical strength, solvent resistance and functionality of the prepared product are not ideal; 3 1. The cross-linking monomer in the raw material adopts N-methylolacrylamide, which can improve the rubbing fastness of the fabric, but the environmental protection of N-methylolacrylamide is poor; 4. Select alkylphenol-containing polyoxyethylene ether (APEO ) Surfactant OP as emulsifier, poor environmental protection; 5. Directly modify acrylate with organosilicon monomer (organosilicon monomer is not prepolymerized), and the modification effect is not obvious; 6. Use sulfonic acid The substance is a modified monomer catalyst, which leads to a decrease in the water resistance of the polymer