A kind of food contact water-based wood coating and preparation method thereof

A wood coating, food contact technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as the inability to meet the requirements of material migration and paint film stability, the lack of research on water-based wood coatings, and the limitation of water-based wood coatings. , to achieve the effect of good appearance, excellent stability and excellent solvent resistance

Active Publication Date: 2021-07-23
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also puts forward strict requirements on the performance of wood coatings. Although traditional solvent-based wood coatings perform well in terms of stability, their disadvantages of high VOC limit their further development.
However, traditional water-based wood coatings are still insufficient in solvent resistance and chemical resistance. In the contact test with food simulants, they cannot meet the requirements of food safety regulations for substance migration and film stability, which also limits water-based wood coatings. Application of coatings in fields requiring high performance
[0004] At present, there are few studies on waterborne wood coatings that can be applied to food contact materials and products

Method used

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  • A kind of food contact water-based wood coating and preparation method thereof
  • A kind of food contact water-based wood coating and preparation method thereof
  • A kind of food contact water-based wood coating and preparation method thereof

Examples

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Effect test

preparation example Construction

[0052] Preparation of vegetable oil modified multi-arm polyol 1:

[0053] 270g castor oil, 200g isophorone diisocyanate and 80g acetone are added in the four-necked round-bottomed flask that nitrogen inlet and outlet are housed through the castor oil of 270g dehydration, stir this mixture at 45 ℃ until NCO reaches 8.04wt%; To 70-75°C, continue to add 120.75g of trimethylolpropane and 65g of acetone, react for 3-4h, the remaining NCO content is measured to be 0.12wt%, stop the reaction, remove the acetone to obtain the vegetable oil modified multi-arm multi-component Alcohol 1.

[0054] Preparation of vegetable oil modified multi-arm polyol 2:

[0055] Add 168g of dehydrated soybean oil and glycerol transesterification reaction product, 160.1g of isophorone diisocyanate and 65g of acetone into a four-necked round-bottomed flask equipped with a nitrogen inlet and outlet, and stir at 45°C The mixture until the NCO reaches 9.22wt%; heat up to 70-75°C, continue to add 120.75g tri...

Embodiment 1

[0064] A kind of food contact water-based wood coating, its composition is as follows, and described specific gravity is weight percentage:

[0065]

Embodiment 2

[0067] A kind of food contact water-based wood coating, its composition is as follows, and described specific gravity is weight percentage:

[0068]

[0069]

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Abstract

The invention relates to a food-contact water-based wood coating and a preparation method thereof, which is prepared from the following components by weight: 50-90% of a multi-arm modified water-based emulsion, 2-15% of a water-based curing agent, and a film-forming assistant 1-8% of additives, 0.5-5.6% of water-based additives, and 3.8-43.5% of water; the food-contact water-based wood coatings prepared by the present invention have excellent solvent resistance and chemical resistance. The film has excellent stability, and has excellent wettability, adhesion, and fullness to various wood substrates. The performance is equivalent to that of traditional solvent-based wood coatings, and has low VOC content, which is less harmful to the environment and human body. Fast drying, efficient and environmentally friendly.

Description

technical field [0001] The invention relates to the field of water-based wood coatings, in particular to a water-based wood coating suitable for various wood substrates and meeting the national safety standards for food contact materials and products and a preparation method thereof. Background technique [0002] Nowadays, environmental issues have been paid more and more attention by governments all over the world. In the field of coatings, traditional solvent-based coatings are restricted in more and more application fields due to their high VOC emissions and greater harm to the human body and the environment. In contrast, the superiority of water-based environmentally friendly coatings has become increasingly prominent. With the continuous advancement of coating technology, water-based wood coatings have been able to meet the performance requirements of most wood application fields, and because of their outstanding environmental protection and safety, they are becoming a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D175/02C09D7/20C08G18/78
CPCC08G18/78C09D175/02C09D175/08C09D7/20
Inventor 孙常青林争超孙伟祖邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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