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Energy-saving crosslinking agent for low-temperature baking varnish

A technology of bridging agent and baking paint, applied in the field of bridging agent for low-temperature baking paint and its preparation, can solve the problems of long drying time, high baking temperature, waste of energy use and the like

Inactive Publication Date: 2012-07-25
ETERNAL CHEM (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the baking temperature of bridging agents for baking varnishes, especially amino resins, is above 130°C, even exceeding 180°C. The baking temperature is too high and the drying time required is long, resulting in waste of energy use. Therefore, it is necessary to develop a bridging agent. A bridging agent for low-temperature baking varnishes that can reduce the baking temperature and increase the bridging rate

Method used

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  • Energy-saving crosslinking agent for low-temperature baking varnish
  • Energy-saving crosslinking agent for low-temperature baking varnish
  • Energy-saving crosslinking agent for low-temperature baking varnish

Examples

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preparation example Construction

[0095] Preparation method of bridging agent for baking varnish

[0096] The present invention improves the polymerization process and provides a novel preparation method of a bridging agent for baking varnish, comprising steps

[0097] (a) paraformaldehyde and melamine carry out carboxymethylation reaction in short chain alcohol;

[0098] (b) adding the first acid to adjust to acidity;

[0099] (c) dehydration carries out etherification reaction;

[0100] (d) adding the second acid, mixing uniformly to obtain the bridging agent for baking varnish,

[0101] Wherein, the short-chain alcohol is n-butanol, isobutanol or a mixture thereof.

[0102] In another preferred example, the mass ratio of the melamine: the paraformaldehyde: the short-chain alcohol is 126:81-260:222-888; preferably, the melamine: the paraformaldehyde: The mass ratio of the short chain alcohol is 126:(100-230):(300-700).

[0103] In another preferred example, the molar ratio of the melamine: the paraforma...

Embodiment 1

[0168] 1.1 Preparation of bridging agent

[0169] Put 600 kg of isobutanol into a polymerization kettle with stirring and reflux condenser, and adjust the solution to pH=8.0 with lye under stirring.

[0170] Add 154kg of paraformaldehyde and heat to reflux until the solution is clear and transparent, then cool down to below 60°C.

[0171] Add 130 kg of melamine, heat up to reflux; add 5 kg of formic acid (the first acid) when it is completely clear, adjust the pH of the solution to be less than 7, start the dehydration etherification reaction, and add 35 kg of benzenesulfonic acid (the second acid) solution, mix well Obtain bridging agent afterward, gross weight is 924kg, filter packing.

[0172] 1.2 Preparation of coating composition

[0173] The amino resin bridging agent prepared in Example 1.1, the existing amino resin (isobutyl etherified amino resin synthesized by adding acid in one step, as a comparison) are mixed with alkyd resin respectively to form a coating compos...

Embodiment 2

[0193] 2.1 Preparation of bridging agent

[0194] Put 510 kg of n-butanol into a polymerization kettle with stirring and reflux condenser, and adjust the solution to pH=7.3 with lye under stirring.

[0195] Add 200kg of paraformaldehyde and heat to reflux until the solution is clear and transparent, then cool down to below 60°C.

[0196] Add 130 kg of melamine, heat up to reflux; add 8 kg of acetic acid (the first acid) when it is completely clarified, adjust the pH value of the solution to be less than 7, and start the dehydration etherification reaction until the end of dehydration.

[0197] Add 10 kg of p-toluenesulfonic acid (second acid) solution, and the reaction is completed to obtain a bridging agent with a total weight of 858 kg, which is filtered and packaged.

[0198] 2.2 Preparation of coating composition

[0199] The amino resin bridging agent prepared in Example 2.1, the existing amino resin (isobutyl etherified amino resin synthesized by adding acid in one ste...

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Abstract

The invention discloses an energy-saving crosslinking agent for a low-temperature baking varnish and the application of the crosslinking agent. The crosslinking agent is prepared by subjecting melamine, paraformaldehyde and short chain alcohol which are used as raw materials to hydroxymethylation, adding a first acid to acidify, dehydrating, etherifying, adding a second acid, and mixing uniformly to obtain the baking varnish crosslinking agent, wherein the short chain alcohol is n-butyl alcohol, or isobutyl alcohol or the mixture of the n-butyl alcohol and the isobutyl alcohol. The crosslinking agent disclosed by the invention can be used together with a thermosetting resin to prepare the low-temperature baking varnish. Due to the adoption of the crosslinking agent, the crosslinking rate of the baking varnish can be improved effectively, the baking temperature of the baking vanish can be reduced, and the energy cost can be lowered greatly. The baking varnish prepared from the crosslinking agent has the same physical property as the high-temperature baking varnish and has stable property at normal temperature and good storage stability.

Description

technical field [0001] The invention relates to a bridging agent for baking varnish, in particular to a low-temperature bridging agent for baking varnish which can reduce the drying temperature and increase the bridging rate, as well as its preparation method and application. technical background [0002] The application range of baking varnish is very wide, from daily necessities to high-tech electronic products, such as from furniture, auto parts, cosmetic casings to various 3C electronic or electrical products (such as digital cameras, notebook computers and mobile phones, etc.) Paint is used to coat the substrate and then baked to form a baking varnish to provide a protective or decorative coating effect. [0003] As people's requirements for the environment are getting higher and higher, low energy, green and environmental protection have become the trend of technological development. Generally, the baking temperature of bridging agents for baking varnishes, especially...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D161/32C08G12/42
Inventor 马俊雄刘勇张华罗荣
Owner ETERNAL CHEM (CHINA) CO LTD