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High-solid-content low-viscosity water-based alkyd emulsion and preparation method thereof

A water-based alkyd technology with high solid content, applied in coatings, anti-corrosion coatings, etc., can solve problems such as low solid content, poor water resistance and anti-corrosion performance, and slow drying

Pending Publication Date: 2020-01-17
SHANGHAI HUAYI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In summary, the outstanding problems of water-based alkyd emulsions in the prior art are: slow drying, poor storage stability, poor water resistance and corrosion resistance, high VOC content, high viscosity, and relatively low solid content

Method used

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  • High-solid-content low-viscosity water-based alkyd emulsion and preparation method thereof
  • High-solid-content low-viscosity water-based alkyd emulsion and preparation method thereof
  • High-solid-content low-viscosity water-based alkyd emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Embodiment 1, prepare the alkyd resin A1~A6 of low acid value

[0088] The formulations and acid values ​​of alkyd resins A1-A6 are listed in Table 1, and the raw materials involved are all commercially available.

[0089] Formulation unit of table 1 alkyd resin A1~A6: parts by weight

[0090]

[0091] The preparation method of alkyd resin A1~A5 is as follows:

[0092] Put the vegetable oil fatty acid, dihydric alcohol or polyol, dicarboxylic acid or anhydride, catalyst and reaction solvent into the reaction kettle in sequence, and gradually raise the temperature to 155±5°C. After the materials melt, start stirring and gradually raise the temperature to 215±5°C, and then keep stirring and reacting in this temperature range until the acid value of the reaction system is less than 5mgKOH / g, that is, alkyd resins A1-A5 with low acid value are obtained.

[0093] The formula and preparation method of alkyd resin A6 are the same as A1, the difference is that the final ac...

Embodiment 2

[0094] Embodiment 2, preparation acrylic modified alkyd resin B1~B7

[0095] The formulations of acrylic modified alkyd resins B1-B7 are shown in Table 2. Among them, A7 is a commercially available alkyd resin of the same type, purchased from a synthetic resin company in Guangdong, and its acid value is 4.5 mgKOH / g.

[0096] Table 2 Formula unit of acrylic modified alkyd resins B1-B7: parts by weight

[0097]

[0098]

[0099] The preparation method of acrylic acid modified alkyd resin B1 comprises the steps:

[0100] a) Control the temperature of the alkyd resin A1 with low acid value in the reactor at 155-160°C. According to the formula in Table 2, the phosphate functional monomer, fluorine-containing functional monomer, vinyl monomer, methacrylic acid, 90% of the total weight of the reaction solvent and 60% of the total weight of the initiator are pre-dissolved and mixed uniformly , and then slowly and uniformly drop it into the reaction kettle, drop it in 3 to 4 h...

Embodiment 3

[0107] Example 3, preparation of water-based alkyd emulsions C1-C8

[0108] The formulations and properties of water-based alkyd emulsions C1-C8 are shown in Table 3.

[0109] Table 3 Formulation and performance of water-based alkyd emulsions C1-C8 Unit: parts by weight

[0110]

[0111] The preparation method of water-based alkyd emulsion C1 comprises the steps:

[0112] (1) Adjust the temperature of acrylic modified alkyd resin B1 to 80±5°C, add the formulated amount of neutralizing agent dropwise into the reaction system, and stir for 0.5 hours to make the neutralization uniform; then add deionized solution dropwise Water, dripped in 1.5 ± 0.5 hours, then stirred for 0.5 hours to make it emulsified evenly, and the solid content of the detection system was 44% (weight);

[0113] (2) Control the temperature at 45±5°C. While stirring, add the formulated amount of isocyanate monomer dropwise to the reaction system, drop it within 0.5 hours, keep warm and stir for 1 hour, t...

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Abstract

The invention discloses a preparation method of a high-solid-content low-viscosity water-based alkyd emulsion. A preparation method comprises the following steps: (1) adding a phosphate functional monomer, a fluorine-containing functional monomer, a vinyl monomer and methacrylic acid into an alkyd resin A with a low acid value according to a formula ratio, and carrying out solution polymerizationin a reaction solvent in the presence of an initiator to obtain acrylic acid modified alkyd resin B; (2) neutralizing the acrylic acid modified alkyd resin B, and diluting the acrylic acid modified alkyd resin B into a viscous emulsion with the solid content of 40-50%; controlling the temperature to be 45 + / -5 DEG C, dropwise adding a proper amount of isocyanate monomer into the emulsion, keepingthe temperature to react for 0.1-2 hours after dropwise adding, then heating to 80 + / -5 DEG C, continuously keeping the temperature to react for 0.1-2 hours, cooling and filtering to obtain a high-solid-content low-viscosity water-based alkyd emulsion C; wherein the acid value of the alkyd resin A is not greater than 5mgKOH / g. The high-solid-content low-viscosity water-based alkyd emulsion disclosed by the invention has the characteristics of high solid content, low viscosity, very low VOC (Volatile Organic Compound) content, very good water resistance, corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a high-solid-content, low-viscosity water-based alkyd emulsion and a preparation method thereof Background technique [0002] Alkyd resin is the largest and most widely used synthetic resin in coating resins. Alkyd resins show exceptionally good film-forming properties due to their low molecular weight, resulting in very high gloss coatings, and are widely used in outdoor large steel applications due to their ease of application and their ability to cross-link with oxygen to make them self-drying Decoration and protection of structures and ships, etc. Alkyd resin has rich sources of raw materials, many varieties, wide application, good performance and low price, and has unique advantages. With the enhancement of national awareness of environmental protection, the formulation of laws and regulations to limit VOC emissions, and the shortage of petroleum energy, traditional solve...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08F220/14C08F230/02C08F212/08C08G63/49C09D151/08C09D5/08C09D7/61
CPCC08F283/01C08G63/48C08K2003/2272C08K2003/3045C09D5/08C09D151/08C09D7/61C08F230/02C08F220/14C08F212/08C08K13/02C08K3/22C08K3/34C08K3/30
Inventor 赵其中
Owner SHANGHAI HUAYI FINE CHEM CO LTD
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