Toughening modified polyvinyl formal acetal emulsion and preparation method thereof

Abstract

The invention discloses a toughening modified polyvinyl formal acetal emulsion which is characterized by being prepared from the following raw materials in parts by weight: 90.8-92 parts of polyvinyl acetate, 91-93 parts of methanol, 9.8-10.5 parts of sulfuric acid, 5-5.2 parts of formaldehyde, 29-31 parts of acetaldehyde, 3-4 parts of OP-10, 1-2 parts of sodium hydroxide, 1-1.5 parts of potassium hydroxide, 9-10 parts of diethyl phthalate and 400-420 parts of water. Emulsion type polyvinyl formal acetal is generated by adopting a two-step reaction method, and OP-10 is added into a reaction system to prevent materials from adhesion, thereby obtaining an emulsion product with uniform particle size dispersion; and diethyl phthalate is added in the last step before forming to enhance the toughness of the product. Compared with a solid production process, the toughening modified polyvinyl formal acetal emulsion disclosed by the invention is simple in process, reduced in production energy consumption, saved in cost, and capable of being matched with water-base resin and prepared into wire enamel, paint special for electronic appliances and the like, and accords with environmental protection requirements.

Description

Technical field [0001] The invention relates to a toughened modified polyvinyl acetaldehyde emulsion and a preparation method thereof. Background technique [0002] Polyvinyl acetal resin is an important chemical product. The molecular structure contains hydroxyl, polycyclic and acetyl groups. It has high transparency, good light resistance, cold resistance, water resistance, film formation and impact resistance. , And has good bonding properties to glass, metal, wood, ceramics, leather, fiber and other materials. In addition, it has good dispersibility for pigments and dyes, and has good mutual solubility with various resins. Among them, polyvinyl acetal ("PVFA" in English) special resin is a kind of polyvinyl acetal resin with regular molecular structure, concentrated viscosity average molecular weight distribution, and both formal and acetal characteristics. Mainly used in the insulation coating and adhesive field of naked copper wires. However, most of the market is solid ...

AI Technical Summary

Problems solved by technology

However, most of the products on the market are solid polyvinyl formal, and the process technology is based on foreign patents. The production process technology has not been truly digested and absorbed, and there are potential safety hazards and environmental risks. The process produces a lot of three wastes, high cost, and difficult to control production operations. And other issues