Self-crosslinking acrylate emulsion and preparation method thereof

Abstract

The invention discloses self-crosslinking acrylate emulsion and a preparation method thereof. The self-crosslinking acrylate emulsion is prepared from (methyl) acrylate monomer, a functional monomer, a crosslinking monomer, a crosslinking agent, an emulsifying agent A, an emulsifying agent B, a buffering agent, an initiator, an oxidizer, a reducer and deionized water, wherein the reducer is an FF6M macromolecule polymerization novel reducer produced by a Bruegmann company in Germany, the emulsifying agent A is an emulsifying agent AEROSOL A-501 produced by a Cytel company in America, and the emulsifying agent B is an emulsifying agent AEROSOL MA-80 produced by the Cytel company in America; the preparation method of the self-crosslinking acrylate emulsion comprises pre-emulsification, emulsification and post treatment. A superfine glass fiber separating plate made by adopting the self-crosslinking acrylate emulsion is low in potassium hypermanganate reduzate content, high in liquid absorption speed, high in amount of absorbed liquid and excellent in performance.

Description

technical field [0001] The invention relates to a self-crosslinking acrylate emulsion and a preparation method thereof, in particular to a self-crosslinking acrylate emulsion suitable for preparing ultrafine glass fiber separators and a preparation method thereof. Background technique [0002] Ultra-fine glass fiber separator is a new type of material compounded by ultra-fine glass fiber felt and glass wool. It has good mechanical strength and vibration resistance, low specific resistivity, high porosity, and large capacity. The battery assembled with this kind of separator has strong starting ability and long service life. The inherent properties of this ultra-fine glass fiber separator include tensile strength, liquid absorption speed, potassium permanganate reduction content, and acid and oxidation resistance, while the main factor affecting the performance of the ultra-fine glass fiber separator is its preparation process. The adhesive used in the film, and the self-cro...

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Problems solved by technology

The shortcomings of this document are: (1) The emulsifier RN-30 itself has poor wettability, and this emulsifier is used in both pre-emulsification and emulsification, which makes the wettability of the final emulsion poor. The ultra-fine glass fiber separator prepared by the emulsion with poor wettability has a slow liquid absorption speed and a small amount of liquid absorption

(2) In the post-treatment stage, the oxidant tert-butyl hydroperoxide and the reductant diabolite are used to remove residual monomers. On the one hand, this method has low removal efficiency and poor effect, and there will still be a large amount of residual monomers; On the other hand, the use of carved white blocks is also prone to formaldehyde, which is harmful to the human body.

The most important thing is that the unsaturated double bonds and formaldehyde in the residual monomers have certain reducing properties, so they are easy to react with potassium permanganate, and finally lead to the reduction of potassium permanganate in the ultrafine glass fiber separator. Higher content affects product performance

Therefore, the self-crosslinking acrylate emulsion is not suitable for the preparation of ultrafine glass fiber separators

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