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Waterproof scratch-resistant waterborne polyurethane coating and preparation method thereof

A water-based polyurethane and scratch-resistant technology, applied in the field of transfer coatings, can solve the problems of poor water resistance, poor abrasion resistance of water-based coatings, easy moisture absorption, etc., and achieve high storage stability, good solvent resistance, and good compatibility. Effect

Inactive Publication Date: 2016-11-16
SHANGHAI CHENGYING NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main problems in the transfer of water-based polyurethane coatings from cigarette packs: because water-based transfer coatings are easier to absorb moisture than solvent-based coatings, and have poor water resistance; The difference is large, resulting in poor abrasion resistance and easy scratching of water-based coatings
However, even if the method of addition polymerization is adopted, the compatibility of polysiloxane (PMDS) and polyurethane is limited, and the use of a large amount of polysiloxane will have a very serious impact on the leveling and light transmittance of the coating.

Method used

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  • Waterproof scratch-resistant waterborne polyurethane coating and preparation method thereof
  • Waterproof scratch-resistant waterborne polyurethane coating and preparation method thereof
  • Waterproof scratch-resistant waterborne polyurethane coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] This embodiment relates to a waterproof and scratch-resistant water-based polyurethane coating, including the following components in parts by weight: 10 parts of polyisocyanate, 10 parts of polyether or polyester polyol, 1 part of silicone polyol, 12 parts of solvent, 3 parts of hydrophilic chain extender, 2 parts of small molecule chain extender, 2 parts of neutralizing agent, 60 parts of water.

[0033] Taking the preparation of 100kg waterproof and scratch-resistant waterborne polyurethane coating as an example, the preparation method of the coating in this embodiment specifically includes the following steps:

[0034] (1) Mix 10kg of polyester polyol (hydroxyl-terminated polyester polyol with a functionality greater than or equal to 2, with a molecular weight of 2000 to 2500), 1kg of silicone polyol (polysiloxane organosilicon compound modified with hydroxyalkyl groups) ) at 120°C, stirring and dehydrating under vacuum conditions for 0.5 hours, until the water cont...

Embodiment 2

[0049] This embodiment relates to a waterproof and scratch-resistant water-based polyurethane coating, including the following components in parts by weight: 12 parts of polyisocyanate, 10 parts of polyether or polyester polyol, 2 parts of silicone polyol, 10 parts of solvent, 3 parts of hydrophilic chain extender, 3 parts of small molecule chain extender, 2 parts of neutralizer, 58 parts of water.

[0050] Taking the preparation of 100kg waterproof and scratch-resistant waterborne polyurethane coating as an example, the preparation method of the coating in this embodiment specifically includes the following steps:

[0051] (1) 10kg of polyester polyol (hydroxyl-terminated polyester polyol with a functionality greater than 2, molecular weight 3500-4000), 2kg of silicone polyol (hydroxyl-terminated polyether modified polysiloxane organosilicon compound) Stir and dehydrate at 120°C for 0.5 hours under vacuum until the water content in polyester polyol and silicone polyol is less...

Embodiment 3

[0059] This embodiment relates to a waterproof and scratch-resistant water-based polyurethane coating, including the following components in parts by weight: 8 parts of polyisocyanate, 12 parts of polyether or polyester polyol, 3 parts of silicone polyol, 10 parts of solvent, 3 parts of hydrophilic chain extender, 2 parts of small molecule chain extender, 2 parts of neutralizing agent, 60 parts of water.

[0060] Taking the preparation of 100kg waterproof and scratch-resistant waterborne polyurethane coating as an example, the preparation method of the coating in this embodiment specifically includes the following steps:

[0061] (1) 12kg of polyether polyol (hydroxyl-terminated polyoxyalkylene polyol with a functionality of 3, molecular weight of 3000-3500), 3kg of silicone polyol (polysiloxane organosilicon compound modified with hydroxyalkyl group) ) at 120°C, stirring and dehydrating under vacuum conditions for 0.5 hours, until the water content in polyether polyol and sil...

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Abstract

The invention discloses a waterproof scratch-resistant waterborne polyurethane coating and a preparation method thereof. The coating comprises the following components in parts by weight: 5-12 parts of polyisocyanates, 5-12 parts of polyether or polyester polyol, 1-4 parts of organosilicon polyol, 8-14 parts of solvents, 1-3 parts of a hydrophilic chain-extender, 1-3 parts of a small molecule chain extender, 1-3 parts of a neutralizer and 50-70 parts of water. Due to the reaction between the organosilicon polyol and polyisocyanates, organosilicon components are introduced into polyurethane emulsion, so that the water resistance and smoothness of the coating are obviously improved; compared with general waterborne coatings, due to the introduced organosilicon polyol, the surface energy of the coating film is reduced, and the coating is endowed with good solvent resistance; and compared with an additive type organosilicon aid, the organosilicon polyol and polyisocyanates are reacted and grafted into a molecular chain, and the coating is endowed with high storage stability.

Description

technical field [0001] The invention relates to the technical field of transfer coatings, in particular to a waterproof and scratch-resistant water-based polyurethane coating and a preparation method thereof. Background technique [0002] my country's cigarette pack printing technology has high requirements for craftsmanship, which has far exceeded that of developed countries in Europe and the United States. The early gold and silver cardboard used in the packaging boxes of tobacco, alcohol, food, daily necessities, etc. was mainly produced by the composite method, that is, the aluminum foil or aluminized film is directly composited with the paper. The aluminum foil and plastic film used in the product cannot be recycled, causing resource waste and environmental pollution. In order to protect the environment and save costs, the direct plating process and the transfer process are now mostly used. Compared with the direct plating process, the advantages of the transfer proce...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D175/08C08G18/08C08G18/40C08G18/61C08G18/66
CPCC09D175/08C08G18/0823C08G18/4009C08G18/61C08G18/6651C08G18/6659C08G18/6674C08G18/6688C08G18/6692C09D175/06
Inventor 董海普张钰馨王玉春谢允斌
Owner SHANGHAI CHENGYING NEW MATERIALS