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Preparation method of hydroxyl-terminated aqueous core shell emulsion for anticorrosive paint

A core-shell emulsion and anti-corrosion coating technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of insufficient separation, weak mechanical properties and medium resistance, and achieve the goal of increasing solid content, high peel strength, and reducing VOC content Effect

Active Publication Date: 2012-12-26
JIANGSU RONGCHANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difference in softening point of the acrylate chain segment results in insufficient separation or weak mechanical properties and medium resistance

Method used

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  • Preparation method of hydroxyl-terminated aqueous core shell emulsion for anticorrosive paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Preparation of double bond-terminated linear polyurethane emulsion

[0052] Put 100 parts of PPG (molecular weight: 2000) into a three-neck flask, vacuum dehydrate at 100°C for 2 hours; cool down to 78°C, add 4.7 parts of NPG and 59.3 parts of IPDI, and keep it warm at 80°C for 3 hours; add DMPA after the reaction solution cools down to 75°C 9.86 parts and 10 parts of co-solvent acetone, keep warm at 78℃ for 0.5-1h, add 0.1 part of DBTDL, continue to react for 1.5-2h; cool down to 60℃, add 12.14 parts of HPMA, keep warm for 1.5h; after the reaction, cool down to 40℃ Add 25 parts of MMA for viscosity reduction, then add 7.4 parts of TEA and stir for 5 minutes, then add 370 parts of deionized water under high-speed stirring to disperse into an emulsion. After 10-15 minutes, slowly add 1.74 parts of hydrazine hydrate, 0.87 parts of ethylenediamine and deionized The mixture of 10 parts of water is chain-extended, and matured at 50°C for 1 hour to obtain a double-bond-ter...

Embodiment 2

[0058] 1) Preparation of double bond-terminated linear polyurethane

[0059] Put 100 parts of PTMG (molecular weight 2000) into a three-necked flask, dehydrate in vacuum at 100°C for 2 hours; cool down to 75°C, add 4.7 parts of NPG and 46.3 parts of TDI, and keep warm at 80°C for 3 hours; after the reaction solution cools to 75°C, add DMPA 9.86 10 parts of acetone and 10 parts of acetone, 78 ℃ heat preservation reaction 0.5-1h, add DBTDL 0.1 part, continue to react for 1.5-2h; after cooling down to 60 ℃, add 12.14 parts of HPMA, heat preservation reaction 1.5h; after the reaction, cool down to 40 ℃ and add 25 parts of MMA for viscosity reduction, then add 7.4 parts of TEA and stir for 5 minutes, then add 370 parts of deionized water under high-speed stirring to disperse into an emulsion, and slowly add 4 parts of ADH, 0.87 parts of ethylenediamine and 10 parts of deionized water after 10-15 minutes part of the mixture for chain extension, and aging at 50°C for 1 hour to obtain...

Embodiment 3

[0065] 1) Preparation of double bond-terminated linear polyurethane

[0066] Put 100 parts of PCL (molecular weight: 2000) into a three-necked flask, dehydrate under vacuum at 100°C for 2 hours; cool down to 80°C, add 4.7 parts of NPG and 59.1 parts of IPDI, and keep warm at 80°C for 3 hours; after cooling down to 75°C, add 9.86 parts of DMPA and auxiliary 10 parts of solvent acetone, 78 ℃ heat preservation reaction for 0.5-1h, dropwise add 0.15 parts of DBTDL to continue the reaction for 1.5-2h; after cooling down to 60 ℃, add 12 parts of HPMA, heat preservation reaction for 1.5h; After 10-15 minutes, slowly add 1.74 parts of hydrazine hydrate, 0.87 parts of ethylenediamine and 20 parts of deionized water to expand the mixture. chain, cured at 50°C for 1 hour to obtain a double-bond-terminated linear polyurethane emulsion.

[0067] 2) Preparation of core layer polyurethane modified acrylate composite emulsion

[0068] Add 4 parts of SDS, 4 parts of Pingpingjia, 35 parts of ...

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Abstract

The invention discloses hydroxyl-terminated aqueous core shell emulsion for anticorrosive paint, and a preparation method of the hydroxyl-terminated aqueous core shell emulsion. Hydroxyl-terminated aqueous anticorrosive acrylate emulsion adopts a core-shell structure, the shell layer is hydroxy phosphate ester type acrylic acid molecules, the core layer is polyurethane modified acrylic ester, and the shell layer adopts acrylic ester synthetized by using hydroxy phosphate as functional monomers. The solid content of the hydroxyl-terminated anticorrosive acrylate emulsion is 40 to 50%. The preparation method comprises the steps as follows: using polymer polyol and isocyanate as polymer monomers, synthetizing polyurethane molecular with double sealed terminals on the condition that vinyl acrylic monomers exist, and then polymerizing with acrylic monomers, such as styrene and methyl methacrylate as a core layer; using the acrylic monomer mixtures containing functional monomers (vinyl alcohol phosphate) as seed emulsion, and dropping the emulsion into the core layer at 70 to 85 DEG C. The method provided by the invention can be used for anticorrosive paint of metal surfaces, such as steel surfaces.

Description

technical field [0001] The invention relates to a method for preparing a hydroxyl-terminated water-based core-shell emulsion for anticorrosion coatings, in particular to a method for preparing a hydroxyl-terminated water-based core-shell acrylate emulsion for anti-corrosion coatings. Background technique [0002] Emulsion polymerization is a kind of polymerization in which isolated latex particles are produced in water (or other liquid medium) according to the mechanism of micelles or oligomers, and free radical addition polymerization or ion addition polymerization is carried out in it to produce high polymers. method. Products such as polyacrylate, styrene-butadiene rubber, and polyvinyl chloride are all mass-produced by emulsion polymerization. Although emulsion polymerization technology has been greatly developed, the electrical properties, optical properties, solvent resistance, and water resistance of emulsion polymerization products cannot fully meet the requirements...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F230/02C08F2/24C08G18/67C09D151/08C09D5/08
Inventor 周铭钟涛王维陈群
Owner JIANGSU RONGCHANG NEW MATERIAL TECH
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