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UV varnish

A technology of varnish and parts by weight, used in polyurea/polyurethane coatings, pretreatment surfaces, and devices for coating liquids on surfaces, etc., can solve the problem of uniform UV varnish with high hardness and low yellowing, low hardness, and yellowing Large and other problems, to achieve the effect of superior performance, low cost, low yellowing

Inactive Publication Date: 2008-01-02
MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, UV varnishes for plastic substrates on the market have some obvious defects, such as: low hardness, yellowing caused by ultraviolet light irradiation, etc.
Resins with high variable density often cause large yellowing, which makes it difficult for UV varnishes to unify high hardness and low yellowing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix and dissolve all raw materials evenly according to the following component formula:

[0031] TMPTA 20g

[0032] DPHA 15g

[0033] UV7605B 40g

[0034] 621A-80 15 grams

[0035] Irgacure184 5g

[0036] EFKA3777 1.0 g

[0037] EFKA3034 0.2 g

[0038] OB 0.5 g

[0039] Toluene 25g

[0040] Ethyl acetate 25g

[0041] Then spray it on the plastic substrate, use a 1KW high-pressure mercury lamp to irradiate and cure with ultraviolet light with an illuminance of 80W.cm-1, and then use a colorimeter to compare the color difference of the substrate before and after spraying, and the obtained results are:

[0042] L=-1.095; a=0.021 b=0.207; E=1.115. Then carry out hardness and adhesion test to its coating film again, and its result is that its pencil hardness is 2H respectively and there is no imprint, and 100 grids do not peel off separately.

Embodiment 2

[0044] Mix and dissolve all raw materials evenly according to the following component formula:

[0045] TMPTA 15g

[0046] DPHA 15g

[0047] UV7605B 45g

[0048] 621A-80 10 grams

[0049] Irgacure184 4g

[0050] EFKA3777 0.5 g

[0051] EFKA3034 0.2 g

[0052] OB 0.5 g

[0053] Toluene 25g

[0054] Ethyl acetate 25g

[0055] Then spray it on the plastic substrate, use a 1KW high-pressure mercury lamp to irradiate and cure with ultraviolet light with an illuminance of 80W.cm-1, and then use a colorimeter to compare the color difference of the substrate before and after spraying, and the obtained results are: L=-0.891; a=0.015 b=0.371; E=0.965. Then carry out hardness and adhesion test to its coating film again, and its result is that its pencil hardness is 2H respectively and there is no imprint, and 100 grids do not peel off separately.

Embodiment 3

[0057] Mix and dissolve all raw materials evenly according to the following component formula:

[0058] TMPTA 20g

[0059] DPHA 15g

[0060] UV7605B 40g

[0061] 621A-80 20 grams

[0062] Irgacure184 5g

[0063] EFKA3777 1.0 g

[0064] EFKA3034 0.2 g

[0065] OB 0.5 g

[0066] Toluene 25g

[0067] Ethyl acetate 25g

[0068] Then spray it on the plastic substrate, and use a 1KW high-pressure mercury lamp to irradiate and cure it with ultraviolet light with an illuminance of 80W.cm-1, and then use a colorimeter to compare the color difference before and after spraying the substrate. The obtained results are: L=-1.147; a=0.057 b=0.281; E=1.182. Then carry out hardness and adhesion test to its coating film again, and its result is that its pencil hardness is 2H respectively and there is no imprint, and 100 grids do not peel off separately.

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PUM

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Abstract

The invention discloses a UV varnish, which comprises the following parts: 25-45% monomer, 50-70% photographic resin, 4-7% photo-initiation agent, 0.7-1.7% adjuvant and 40-60% solvent, wherein the monomer consists of TMPTA and DPHA; the photographic resin is aliphatic PUA, which contains UV7605B and 621A-8; the photographic resin includes Irgacure184 and the adjuvant contains EFKA3777, EFKA3034 and OB (optical brightener); the solvent contains toluene and acetic ester. The invention matches high hardness resin and high hardness active diluent with OB to realize the uniformity of high hardness and low yellow changing rate, which reduces cost with good economic benefit.

Description

technical field [0001] The invention relates to a UV coating, in particular to a UV varnish for coating plastic substrates. Background technique [0002] UV coating is a coating that is hardened by chemical action caused by ultraviolet radiation. Its main components are composed of photosensitive resin, reactive diluent, photoinitiator and additives. The coating uses high-energy ultraviolet light as a curing energy source. The photoinitiator absorbs ultraviolet light energy to form free radicals, triggers photosensitive resin and reactive diluent molecules, and then undergoes chain polymerization reaction, so that the coating film is cured. [0003] UV coatings have the advantages of fast curing speed, energy saving, room temperature curing, superior performance, and environmental protection. The coating speed is fast, the film layer has high brightness, and the film surface is firm and heat-resistant after drying, which can make the surface of the substrate very bright and ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12B05D3/06B05D7/02
Inventor 袁春来邓燕马迎娜
Owner MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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