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Soap-free microemulsion of multiple cross-linked polyurethane-vinyl polymer as plastic paint substrate and preparation thereof

A vinyl polymer, multiple cross-linking technology, used in coatings and other directions, can solve problems such as unsuitable formulation of plastic coatings

Active Publication Date: 2013-02-13
DONGGUAN DAXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that in the current general PUA emulsion, PA only modifies PU to a certain extent, and the coating film mainly shows the performance of PU film, so it is mainly used for the preparation of wood coatings, and is generally not suitable for the preparation of plastic coatings, especially PS. plastic coating

Method used

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  • Soap-free microemulsion of multiple cross-linked polyurethane-vinyl polymer as plastic paint substrate and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: as the emulsion of PS plastic coating base material

[0049] Preparation process: 96g of toluene diisocyanate (TDI-80), 65g of polyethylene glycol with an average molecular weight of 1000, 7.5g of 1,4-butanediol, 90g of styrene, and 40g of methyl methacrylate were mixed at a stirring speed of 300rpm. Add ester, 0.1g dibutyltin dilaurate and 0.06g hydroquinone into a clean and dry 1000ml four-neck flask with stirring paddle, condenser tube and thermometer, heat in a water bath, and react at a temperature of 80±2°C for 2 hours, Obtain polyurethane prepolymer with terminal-NCO; add 24.5g dimethylolpropionic acid and 15g-β-hydroxyethyl methacrylate, react at 75±2°C for 1.5 hours, and obtain double bond and -NCO as terminal group A polyurethane prepolymer containing hydrophilic groups; the system is maintained at 70±2°C, and 0.44g of azobisisobutyronitrile, 0.35g? Add methyl styrene dimer and 30g ethyl acetate, react for 3 hours to obtain polyurethane-vinyl gr...

Embodiment 2

[0060] Embodiment 2: as the emulsion of HIPS, ABS plastic paint base material

[0061] Preparation process: 115g of isophorone diisocyanate, 70g of polyethylene adipate with an average molecular weight of 2000, 9.2g of 1,6-hexanediol, 40g of styrene, 55g of methyl Add methyl acrylate, 0.12g stannous octoate and 0.05g hydroquinone into a clean and dry 1000ml four-neck flask with stirring paddle, condenser and thermometer, heat in a water bath, and react at a temperature of 90±2°C for 2 hours. Obtain a polyurethane prepolymer with terminal -NCO; add 25.5g of dimethylolbutyric acid and 15.0g of -β-hydroxyethyl methacrylate, and react for 2 hours at 80±2°C to obtain a terminal with double bonds and -NCO Hydrophilic group-containing polyurethane prepolymer; maintain the system at 75±2°C, add 0.33g of azobisisobutyronitrile, 0.30g of n-dodecanethiol and 20g of acetone, and react for 3 hours to obtain -NCO end group Polyurethane-vinyl prepolymer with hydrophilic groups; cool down to...

Embodiment 3

[0072] Example 3: PS plastic silver water-based paint

[0073] Coating Formulation:

[0074]

[0075] Preparation process: Mix 12g EFC 300, 6g propylene glycol and 6g deionized water in advance, mix 50g SK-120 and 20g deionized water, dilute 1.5g SN-thickener 612 with 3g deionized water. Then add 450g of Example 1 emulsion into the paint mixing tank and place it under the disperser, adjust the rotating speed to 1000rpm, add the prefabricated EFC 300, propylene glycol and deionized water solution, add 1.5g FoamStar A10, 2.2g SN- Dispersant 5020, 1.6g Wet KL245, 1.6g BYK 380N, and then dispersed for 15min. Slowly add 18g of DH-600A, a homogeneous mixture of prefabricated SK-120 and deionized water, and disperse for 30min at 800rpm. Add 1.2g of Alex F-252 at 300rpm, water-diluted SN-thickener 612, and ammonia water to adjust the pH to 8-10, disperse for 10 minutes and let it stand for defoaming to obtain about 570g of silver-colored water-based paint.

[0076] Main performa...

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Abstract

The invention relates to a soap-free microemulsion of a multiple cross-linked polyurethane-vinyl polymer as a plastic paint substrate. The emulsion colloidal particle has a core-shell structure in which a polyurethane vinyl graft polymer is used as a shell and a vinyl polymer is used as a core; the inside of the shell is cross-linked, the inside of the core is cross-linked, and the space between the core and the shell is cross-linked; a core-shell polymer is a heterocomplex of a core polymer and a shell polymer; the content of the vinyl polymer is greater than or equal to 50% of the total content of polymers; the emulsion colloidal particle does not contain external emulsifiers; and the particle diameter of the colloidal particle is less than 100nm. The preparation and cross-linking process comprises the following steps: firstly, synthesizing a hydrophilic polyurethane vinyl graft prepolymer containing -NCO end groups, and then, uniformly mixing the prepolymer with a vinyl core monomer; carrying out aqueous dispersion and polyamine chain extension and cross-linking to form a cross-linking type aqueous dispersion intermediate with the polyurethane vinyl graft polymer shell coated on the core monomer; carrying out free radical emulsion polymerization and cross-linking of the core monomer; and automatically cross-linking the core and the shell in the film forming process. The core and the shell of the emulsion colloidal particle contain structure units similar to the molecular structure of PS plastics, the vinyl polymer and the polyurethane are highly compatible, the emulsion colloidal particle can be attached to PS, HIPS and ABS plastics easily, and the coated film has excellent mechanical properties and chemical resistance.

Description

technical field [0001] The invention relates to a base material used as a single-component water-based paint for PS, HIPS and ABS plastics, and relates to multiple cross-linked polyurethane-vinyl polymer soap-free microemulsions and a preparation method thereof. technical background [0002] As a kind of high molecular polymer, plastic has low surface free energy and low polarity, so it is difficult to adhere to the surface when it is painted. Improving the adhesion performance of plastic coatings is the key to plastic coatings. The theory of coating adhesion and diffusion proposed by Xyutskii believes that: the coating adhesion and diffusion theory believes that the size of the coating adhesion is closely related to the ability of the coating to diffuse into the plastic substrate. Once the coating penetrates into the plastic substrate, the infiltrate and the plastic The electrostatic and mechanical interlocking phenomena existing between the substrates will significantly e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F283/00C08G18/66C08F2/22C08J3/24C09D187/00C09D151/08
Inventor 何晓明蔡双儿叶斌
Owner DONGGUAN DAXING CHEM