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Emulsion polymerization reaction method

An emulsion polymerization and reaction technology, applied in the direction of ester copolymer adhesives, adhesive types, etc., can solve the inherent quality (dry resistance, water washability cannot be guaranteed, poor water washability and cold resistance, product dispersion, Poor stability and other problems, to achieve the effect of improving self-crosslinking performance, soft hand feel, and improved water resistance

Inactive Publication Date: 2013-07-24
长兴三伟热熔胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the washing resistance and cold resistance of polyacrylate are relatively poor, and its "cold brittle and hot sticky" characteristics limit its application in medium and high-grade powder-free base pulp
When some fusible interlining manufacturers currently use powder-free base pulp, most of them use common polypropylene latex in other industries and a simple manual labor and physical mixing process with water. The dispersion and stability of the product are poor, and large-scale production coating It is difficult to control the process during layer operation, and the internal quality (drying resistance, washing performance) cannot be guaranteed

Method used

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Examples

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preparation example Construction

[0016] A method for preparing self-crosslinking water-based polyacrylate powder-free base paste for clothing adhesive lining, comprising the following steps: first, mixing water-based polyacrylate emulsion, auxiliary agents and deionized water, wherein the water-based polyacrylate Acrylate emulsion is prepared by pre-emulsion, seed emulsion, sub-emulsion, 10% adipic hydrazide aqueous solution and ammonia water. The pre-emulsion is composed of methyl methacrylate, butyl acrylate, acrylic acid, diacetone acrylamide , sodium alkylamide ethylene sulfonate, fatty alcohol polyoxyethylene ether and deionized water. The seed emulsion is prepared from a composite initiator and a polymerization bottom material. Oxyethylene ether and deionized water are prepared, the composite initiator is prepared from ammonium persulfate, sodium dodecylbenzenesulfonate and deionized water, and the secondary emulsion is composed of monomers and emulsifiers, The monomer is composed of methyl methacrylate...

preparation example 1

[0077] The present invention adopts the semi-continuous emulsion polymerization process and seed emulsion polymerization method of pre-emulsified monomers to carry out conventional emulsion polymerization and core-shell emulsion polymerization respectively on the same formula, and designs the composition of the core-shell to synthesize a series of polymer emulsions. The formulation composition is shown in Table 1.

[0078] Table 1 Different polymerization methods and formulation composition

[0079]

[0080]

[0081] Table 2 shows the stability and emulsion properties of different polymerization methods.

[0082] Table 2 Stability and emulsion properties of different polymerization methods

[0083]

Embodiment 1

[0085] Take the PRA-2 sample emulsion in Preparation Example 1 and cool it down to room temperature, slowly add 10% adipic hydrazide (ADH) aqueous solution, and neutralize it with ammonia water until the pH value is 7-8. Filtration, discharge, to obtain a milky white emulsion in blue light, which is the product of the present invention—a main emulsion of self-crosslinking type water-based polyacrylate powder-free base slurry for clothing adhesive interlining.

[0086]The basic formula of the powder-free base slurry includes, in addition to the medium water, the main emulsion of the base, a pH regulator, a thickener, a tackifier, a whitening agent, a preservative, and a defoamer. Calculate the amount of deionized water and main emulsion according to the preset plan, adjust the pH value of the system to neutral with ammonia water, and then add the corresponding water-based additives to adjust the viscosity [viscosity <30000 (mPa·s / 20°C)] After that, the product of the present in...

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Abstract

The invention discloses an emulsion polymerization reaction method comprising the steps that: 1, a core emulsion is prepared, wherein a 3 / 4 composite initiator solution is divided into four parts; a reaction temperature is maintained at 75 DEG C; a first part of the composite initiator solution is added into a reaction kettle and is mixed with a seed emulsion; rest 3 / 4 of a pre-emulsification liquid is dropped in within 1h, wherein a second part of the composite initiator solution is supplemented with a time interval of 30min; 2, a shell emulsion is prepared, wherein an emulsification agent in a sub-emulsification liquid is added into the reaction kettle in one time; a third part of the composite initiator is supplemented, and sub-emulsification liquid monomer is dropped in; after 30min, a fourth part of the composite initiator is dropped in, and the dropping is finished 20min before the dropping of the sub-emulsification liquid monomer; the temperature is increased to 80 DEG C, and a reaction is carried out for 2h; the temperature is reduced to room temperature, and a 10% adipic dihydrazide water solution is slowly added; the pH value is neutralized to 7-8 by using ammonia water; and filtering is carried out, such that waterborne polyacrylate emulsion is prepared. According to the invention, the preparation process and the product are cleaner, such that requirements of green, environment-friendly, and healthy are satisfied. The invention keeps pace with the trend.

Description

technical field [0001] The invention relates to a preparation method of self-crosslinking water-based polyacrylate powder-free slurry for clothing adhesive lining, in particular to an emulsion polymerization reaction method for preparing water-based polyacrylate emulsion. Background technique [0002] Since the appearance of double-point interlining, due to its outstanding advantages such as superior comprehensive performance, beautiful appearance, and wide application range, it has become the most important type of interlining industry in my country in less than ten years of development. Modern new coating technology with added value turns a new page. However, from a technical point of view, the field of double-point special powder-free base pulp is still random and blind. There are even a considerable number of interlining manufacturers who have chosen a large number of other industries to mix emulsion and water. There is no way to talk about washing resistance and solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F220/58C08F2/30C08F2/26C08J3/24D06M15/263C09J133/12
Inventor 殷伟乔
Owner 长兴三伟热熔胶有限公司
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