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A kind of core-shell structure nano-titanium dioxide/fluorine-containing polyacrylate soap-free composite emulsion and preparation method thereof

A nano-titanium dioxide and polyacrylate technology, used in textiles, papermaking, fiber processing, etc., can solve the problems of environmental and operator safety hazards, increased VOC value of water emulsion, poor film gloss and water resistance, etc., to achieve excellent surface performance, Increased interfacial interaction and improved water and oil repellency

Active Publication Date: 2016-04-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main methods for preparing fluorine-containing polyacrylate emulsion fabric finishing agents using soap-free emulsion polymerization technology: (1) using ionic monomers to participate in copolymerization to prepare fluorine-containing polyacrylate emulsion fabric finishing agents with good performance, This method has the disadvantages of large particle size of the emulsion, poor film-forming property, poor gloss and water resistance of the film, and poor stability and low solid content of the emulsion.
(2) Fluoroacrylate emulsions for fabric finishing with good hydrophobicity and oleophobicity can be obtained by adding a co-solvent method. This method has the advantages of high solid content of the emulsion and fast polymerization reaction speed, etc., but the co-solvent is organic Solvents will increase the VOC value of the water emulsion (VOC is the abbreviation of volatile organic compounds), which will cause harm to the environment and the safety of operators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method of pre-emulsion A:

[0030] In parts by mass, mix 5-6 parts of methyl methacrylate, 7-11 parts of butyl acrylate, 0.4-0.7 parts of reactive emulsifier and 29-36 parts of deionized water, and stir the mixed solution at high speed for 30- 50min.

[0031] Wherein, the reactive emulsifier is selected from sodium allyloxy hydroxypropyl sulfonate, sodium acrylamide isopropyl sulfonate, sodium alkylphenol polyether sulfosuccinate monoester containing double bond, allyl alkane Sodium sulfosuccinate diester, allyl polyether sulfate, alkyl allyl phenoxy polyether sulfate.

[0032] The preparation method of pre-emulsion B:

[0033] In parts by mass, 2.5-5 parts of methyl methacrylate, 10-13 parts of acrylate or methacrylate, 3.5-6 parts of fluorine-containing acrylate, 0.6-1 part of reactive emulsifier and 25-30 parts of deionized water, and the mixture was stirred at high speed for 30-50 min.

[0034] Wherein, the reactive emulsifier is selected from so...

Embodiment 1

[0039] Step 1: In parts by mass, add 0.05 part of nano-TiO containing double bonds to the beaker 2 , 4 parts of methyl methacrylate, 6 parts of butyl acrylate, 0.4 parts of reactive emulsifier and 30 parts of deionized water, after mixing uniformly, ultrasonically dispersed for 20min to obtain ultrasonic dispersion liquid A.

[0040] Wherein, the reactive emulsifier selects sodium allyloxy hydroxypropyl sulfonate;

[0041] Nano-TiO containing double bonds 2 The particle size is 20 nm, and the double bond content is 0.4 mmol / g.

[0042] Step 2: In parts by mass, add the ultrasonic dispersion A into a reactor equipped with a stirrer, a thermometer and a feeding device, add 2.1 parts of an aqueous initiator solution, and keep the temperature at 80°C for 20 minutes; Emulsion A and 3.3 parts of aqueous initiator solution, after dripping, were reacted at 80°C for 60min; after that, pre-emulsion B and 4.6 parts of aqueous initiator solution were added dropwise within 90min, after d...

Embodiment 2

[0060] Step 1: In parts by mass, add 0.5 part of nano-TiO containing double bonds to the beaker 2 , 4 parts of methyl methacrylate, 7 parts of butyl acrylate, 0.5 part of reactive emulsifier and 30 parts of deionized water, after mixing uniformly, ultrasonically dispersed for 20min to obtain ultrasonic dispersion liquid A.

[0061] Wherein, the reactive emulsifier is selected from sodium acrylamide isopropyl sulfonate;

[0062] Nano-TiO containing double bonds 2 The particle size is 20 nm, and the double bond content is 0.4 mmol / g.

[0063] Step 2: In parts by mass, add the ultrasonic dispersion A into a reactor equipped with a stirrer, a thermometer and a feeding device, add 3 parts of an aqueous initiator solution, and keep the temperature at 80°C for 20 minutes; Emulsion A and 4 parts of initiator aqueous solution, after dripping, react at 80°C for 70min; after that, add pre-emulsion B and 6 parts of initiator aqueous solution dropwise within 100min, after dripping, react...

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Abstract

The invention relates to a core-shell structure nanometer titanium dioxide / fluorine-containing polyacrylate soap-free composite emulsion and a preparation method thereof. In the prior art, methods for preparation of fluorine-containing polyacrylate emulsion fabric finishing agents by use of a soap-free emulsion polymerization technology have the disadvantages that emulsion particle sizes are larger, film forming ability of the emulsions is poor, gloss and water resistance of films are low, the stability and solid content of the emulsions are low, and the like. The core-shell structure nanometer titanium dioxide / fluorine-containing polyacrylate soap-free composite emulsion is prepared from raw materials comprising a reactive emulsifier, a fluorine-containing acrylate monomer, a (methyl) acrylate monomer and double-bond-containing nanometer titanium dioxide by a soap-free emulsion polymerization method, and can be used as a fabric waterproof and oilproof finishing agent. Through use of the preparation method, unfavorable effects of small-molecular emulsifiers on the fluorine-containing polyacrylate can be eliminated, and the excellent characteristics of the nanometer titanium dioxide are introduced into the fluorine-containing polyacrylate, so that the fluorine-containing monomer is in a shell layer, and the fabric finishing agent with excellent waterproof and oilproof properties is obtained, and the preparation method has the advantages of low cost, environmental friendliness and the like.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-containing fabric finishing agent, in particular to a core-shell structure nano-titanium dioxide / fluorine-containing polyacrylate soap-free composite emulsion and a preparation method thereof. Background technique [0002] Due to the characteristics of fluorine, organic fluoropolymers have excellent solvent resistance, oil resistance, weather resistance, high temperature resistance, chemical resistance, surface self-cleaning and other properties, and occupy a very important position in polymer materials. Organofluorine-modified acrylic resin has the high surface activity, high thermal stability, high chemical stability, hydrophobicity of organic fluorine polymer on the basis of maintaining the good film-forming property, flexibility and adhesion of polyacrylate polymer. Water and oil repellency, it is widely used in waterproof finishing, oil repellent finishing and antifouling finishing of tex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/14C08F220/18C08F220/22C08F2/22D06M15/277
Inventor 周建华王林本马建中吕晓敏
Owner SHAANXI UNIV OF SCI & TECH
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