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Novel epoxy-polyacrylate core-shell emulsion and preparation method thereof

A technology of polyacrylate and acrylate, which is applied in the field of new epoxy-polyacrylate "core-shell" emulsion and its preparation, can solve the problem of decreased epoxy retention rate of epoxy resin, affecting the performance of epoxy resin, epoxy resin Problems such as radical ring opening, to achieve the effect of retaining excellent performance, reducing the probability of side reactions, and small side reactions

Inactive Publication Date: 2014-05-14
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical method and the phase inversion method mainly modify the epoxy resin by physical methods. The advantage is that the process is simple, but the stability is poor; the chemical modification method is also called the self-emulsification method, which introduces some hydrophilic groups into the On the molecular chain of epoxy resin, the advantage is that the emulsion has good stability, but the ring opening of the epoxy group will occur during the modification process, and the epoxy retention rate of the epoxy resin will decrease during the reaction process, which will affect the performance of the epoxy resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (2) Add the dotter to the reaction system. At the temperature of 80 ° C ~ 90 ° C, add the remaining acrylic hybrid monomer, add it within 3 to 4 hours, and keep the insulation for 1 to 5 hours;

[0021] (3) Cooling to less than 50 ° C.

[0022] Example 2:

[0023] The new type of epoxy-polyacrylate "nuclear-shell" emulsion method described in the Example 1, the acrylate mixed monomer of the step (1) is acrylite, the styrene, methyl acrylic, acrylic, and acrylic.A mixture of hydroxyl esters, a hydroxyl ester of acrylics, a hydroxyl ethyl, acrylic hydroxyl acetal, methacryal hydroxyl ethyl, and the cause of the subsequent (2) cause is sodium sulfate, potassium excessive sulfate, excessiveA type of ammonium sulfate.

Embodiment 2

[0025] The new type of epoxy-polyacrylate "nuclear-shell" emulsion in the embodiments 1 or 2, step (1), (2) the solid amount of epoxy resin emulsion used in steps (1), (2) is 50 WT%, and acrylic, liblite, acrylic acidThe mass ratio of hydroxyl esters, methyl acrylic methyl ester, and styrene is (3 ~ 18): 4: (3 ~ 5): (2 ~ 4): (1 ~ 3), step (2) the cause of the causeThe dosage is 0.5%~ 1.5WT%of the total amount of acrylate mixed monomers.

Embodiment 3

[0027] The preparation method of the new epoxy-polyacrylate "nuclear-shell" emulsion, 20g of epoxy resin emulsion and one-third of the acrylic mixed monomer of 30 ° C 30min, then add 0.35g cause of sodium sulfate to sodium sulfate toIn the reaction system, add two-thirds of the remaining acrylic hybrid monomer at 80 ° C, add 3 hours to add, stop heating after 2 hours of heat preservation, cool down to less than 50 ° C, and get epoxy-Polyacrynal "nuclear-shell" emulsion.A total of 30g of acrylate mixed monomers, of which 10g of acrylate, 7.5g of acrylic hydroxyl ethyl, 7.5g of methyl acrylic, 5g of styrene, epoxy resin emulsion, acrylic acid, hydroxyl ethyl, methacrylate, methyl acrocylic acidThe mass ratio of methyl ester and styrene is 8: 4: 3: 3: 2.

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Abstract

The invention discloses a novel epoxy-polyacrylate core-shell emulsion and a preparation method thereof. Aqueous epoxy resin is generally an emulsion, a water dispersing body or an aqueous solution formed by dispersing micro particles, liquid drops or colloid into a water phase; the emulsion, the water dispersing body and the aqueous solution are different in particle sizes of epoxy resin dispersing phases. The preparation method for the novel epoxy-polyacrylate core-shell emulsion comprises the steps of (1) emulsifying the epoxy resin emulsion prepared by a phase inversion method and 1 / 3 of acrylate mixed monomers under the temperature of 20-40 DEG C for 0.5 hour; (2) adding an initiator into a reaction system, adding the residual acrylate mixed monomers drop by drop under the temperature of 80-90 DEG C for 3-4 hours, and preserving the heat for 1-5 hours; and (3) cooling the mixture to be below 50 DEG C, and discharging. The novel epoxy-polyacrylate core-shell emulsion disclosed by the invention is used as paint or a paint base material.

Description

Technical field: [0001] The invention involves a new type of epoxy-polyacrylate "nuclear-shell" lotion and its preparation methods. Background technique: [0002] Water -based epoxy resin usually refers to the emulsion, aquatic dispersed or aquatic solution formed in the water phase in the form of particles, liquid droplets, or colloidal forms.EssenceAccording to the different preparation methods, the water nature of epoxy resin has the following four methods: mechanical method, chemical modification method, reverse rotation method, and curing agent emulsification method.The mechanical method and the reverse rotation method mainly modify the epoxy resin through physical methods. The advantage is that the craftsmanship is simple, but the stability is poor; the chemical modification method is also called the self -emulsification method.On the molecular chain of epoxy resin, its advantage is that the emulsion stability is good, but the epoxy base is opened during the modification pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F2/32
Inventor 刘立柱张笑瑞李金凤翁凌崔巍巍
Owner HARBIN UNIV OF SCI & TECH
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