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Preparation method of self-extinction emulsion taking oily extinction resin as core

A matting resin, self-extinguishing technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problem of corrosion resistance, scratch resistance, bending resistance performance characteristics decline, can not achieve high blackness matting effect, reduce Coating gloss and other issues, to achieve transparent matting, superior hand feel, solve the effect of molecular weight instability

Active Publication Date: 2020-10-30
清远市美佳乐环保新材股份有限公司
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  • 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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  • Preparation method of self-extinction emulsion taking oily extinction resin as core
  • Preparation method of self-extinction emulsion taking oily extinction 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...

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 IPDI 174g, Unisafe C-1100 (NOF Corporation) 180g, DMPA18g, 1,4-BDO 20g, K24 (bismuth catalyst) 1g and I1010 (antioxidant) 1g into a 500ml three-necked flask, and heat up to 85-90 React at ℃, 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 polymer oil-based matt...

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Abstract

The invention provides a preparation method of a self-extinction emulsion taking oily extinction resin as a core. The method comprises the following steps: S1, reacting crystalline polyester polyol with crystalline diisocyanate in a strongly polar water-soluble solvent to generate a crystalline polyurethane prepolymer; adding dihydric alcohol, grafting organosilicone polyol with residual-NCO, andcontinuously reacting to generate oily extinction resin; S2, taking low-viscosity EO-containing polyhydric alcohol, and adding dihydric alcohol, carboxyl dihydric alcohol, a bismuth catalyst, an antioxidant and IPDI to prepare a low-viscosity waterborne prepolymer; and S3, adding the oily matting resin in the S1 into the low-viscosity waterborne prepolymer in the S2, adding a salt-forming agent and a chain extender for emulsification, diluting with water after emulsification, and adding a rear chain extender for chain extension to obtain the solid self-matting emulsion. According to the preparation method, the oily matting resin is firstly prepared and co-emulsified with the low-viscosity waterborne prepolymer, so that the emulsion is kept spherical and is not hollow when forming a membrane, 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 Applications(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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