A kind of preparation method of self-dulling emulsion with oily matting resin as core

A matting resin and self-matting technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve problems such as easy breakage and shedding, corrosion resistance and scratch resistance, decreased bending resistance performance characteristics, and surface whitening. , to achieve the effects of transparent matting, excellent film-forming properties, and soft touch

Active Publication Date: 2021-11-23
清远市美佳乐环保新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a matting agent, silica has the advantages of stable chemical properties, high matting efficiency, good transparency, and less addition; Disadvantages, for example, the stability of the emulsion is reduced and the viscosity is increased; the brittleness of the prepared coating is increased, and it is easy to break and fall off. In addition, performance characteristics such as corrosion resistance, scratch resistance, and bending resistance are also reduced.
However, in the technical solutions of these patents, there are also technical problems that have not been considered. For example, the aqueous emulsion is spherical when it is not formed into a film, but it will be deformed during the film forming process and will not maintain the spherical shape, so it cannot have a matting effect after film formation. ; Some patents also mention hollow microspheres, the coating film can maintain a spherical shape and have a matting effect, but the surface of this emulsion is whitish and cannot achieve a high blackness matting effect

Method used

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  • A kind of preparation method of self-dulling emulsion with oily matting resin as core
  • A kind of preparation method of self-dulling emulsion with oily matting resin as core

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for preparing a self-dulling emulsion with an oily matting resin as a core, comprising the following steps:

[0051] S1. Preparation of oil-based matting resin: In a strong polar water-soluble solvent, react crystalline polyester polyol with crystalline diisocyanate to prepare the first-stage product to generate crystalline polyurethane; in the second stage, add binary Alcohol, use the residual -NCO to graft silicone polyols, continue to react, and use the incompatibility between polar polyurethane and non-polar silicone to generate oily matting resin;

[0052] S2. Preparation of low-viscosity water-based prepolymer: adopt low-viscosity EO-containing polyol, and add glycol, carboxyl glycol, bismuth catalyst, antioxidant and IPDI, and react to obtain low-viscosity water-based prepolymer;

[0053] S3. Co-emulsification: Add the oil-based matting resin of S1 to the low-viscosity water-based prepolymer of S2, and add a salt-forming agent and a chain extender for em...

Embodiment 2

[0061] A self-dulling emulsion prepared by the following preparation method:

[0062] (1) Preparation of polymer oily matting resin

[0063] Take DMF 200g, PCD3000 150g and H 12 MDI13g, react at 80°C for 2 hours, add 1,4-BDO 27g, H 12 MDI 78g, DMF 100g and SF8427 50g, and gradually add H 12 MDI 5.2g to increase the viscosity, finally add DMF434g, adjust the viscosity to 3000-5000mPa.S, non-volatile content 30±2%, average molecular weight about 40000.

[0064] (2) Preparation of low-viscosity water-based prepolymer

[0065] Take 174g of IPDI, 180g of Ymer N120 (Pastor, Sweden), 18g of DMPA, 20g of 1,4-BDO, 1g of K24 (bismuth catalyst), 1g of I1010 (antioxidant), put them into a 500mL three-necked flask, and heat up to 90-95 React at ℃, cool down when the NCO value drops to 1.2-1.3mmol / g, and set aside.

[0066] (3) Preparation of solid self-dulling emulsion

[0067] Take 100g of low-viscosity water-based prepolymer, 100g of polymer oil-based matting resin, and 3g of TEA a...

Embodiment 3

[0069] A self-dulling emulsion prepared by the following preparation method:

[0070] (1) Preparation of polymer oily matting resin

[0071] Take 200g of DMF, 150g of PBA3000 and 12.5g of MDI100, react at 80°C for 2 hours, add 27g of 1,4-BDO, 75g of MDI100, 100g of DMF, 50g of SF8427 (molecular weight 2000, dihydroxyl), gradually add 5g of MDI100 to increase the viscosity, and finally add DMF 434g, adjusted viscosity 3000-5000mPa.S, non-volatile content 30±2%, average molecular weight about 30000.

[0072] (2) Preparation of low-viscosity water-based prepolymer

[0073] Take 174g of IPDI, 180g of Unisafe C-1100 (NOF Corporation), 18g of DMPA, 20g of 1,4-BDO, 1g of K24 (bismuth catalyst) and 1g of I1010 (antioxidant) into a 500ml three-necked flask, and heat up to 85-90°C React, cool down when the NCO value drops to 1.2-1.3mmol / g, and set aside.

[0074] (3) Preparation of solid self-dulling emulsion

[0075] Take 100g of low-viscosity water-based prepolymer, 100g of polyme...

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Abstract

The invention provides a method for preparing a self-dulling emulsion with an oily matting resin as the core, comprising the following steps: S1. In a highly polar water-soluble solvent, reacting crystalline polyester polyol with crystalline diisocyanate to generate crystals non-volatile polyurethane prepolymer; add diol, and use residual ‑NCO to graft silicone polyol to continue the reaction to generate oily matting resin; S2. Use low-viscosity EO-containing polyol, and add diol, carboxyl diol Alcohol, bismuth catalyst, antioxidant and IPDI, prepare the low-viscosity water-based prepolymer; S3. join the oily matting resin of S1 in the low-viscosity water-based prepolymer of S2, and add salt forming agent and chain extender to carry out Emulsify, dilute with water after emulsification, add a post-chain extender to extend the chain, and obtain a solid self-dulling emulsion. In this preparation, an oil-based matting resin is prepared first, and co-emulsified with a low-viscosity water-based prepolymer, so that the emulsion maintains a spherical shape and is not hollow when forming a film, and the coating can ensure high matting and high blackness effects.

Description

technical field [0001] The invention relates to the technical field of organic polymer synthesis, in particular to a method for preparing a self-dulling emulsion with an oily matting resin as the core. Background technique [0002] Most of the coating films formed by water-based emulsions are bright. In order to achieve the matting effect, more matting agents are added; and the most commonly used matting agent is silicon dioxide. As a matting agent, silica has the advantages of stable chemical properties, high matting efficiency, good transparency, and less addition; Disadvantages, for example, the stability of the emulsion is reduced and the viscosity is increased; the brittleness of the prepared coating is increased, and it is easy to break and fall off. In addition, performance characteristics such as corrosion resistance, scratch resistance, and bending resistance are also reduced. [0003] In some emulsion preparation methods, additives or organically modified silica m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D175/04C09D175/08C08G18/10C08G18/66C08G18/42C08G18/44C08G18/61C08G18/12C08G18/32C08G18/34C08G18/48
CPCC08G18/10C08G18/12C08G18/3206C08G18/348C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4833C08G18/4854C08G18/664C08G18/6674C08G18/6685C08G18/6692C09D175/04C09D175/06C09D175/08C08L75/08C08L75/06C08L75/04C08G18/61C08G18/3855C08G18/3231C08G18/3234
Inventor 关仲翔姚文佩
Owner 清远市美佳乐环保新材股份有限公司
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