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A kind of varnish for water-based coil and preparation method thereof

A technology of varnish and coil material, applied in the direction of coating, epoxy resin coating, etc., can solve the problems that need to be further improved, and achieve the effect of good gloss and color retention, clarity and transparency, and full coating film

Active Publication Date: 2021-01-26
中山创美涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual industry and daily application, common water-based varnishes for coils use acrylic resin as the main material. still needs to be further improved

Method used

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  • A kind of varnish for water-based coil and preparation method thereof
  • A kind of varnish for water-based coil and preparation method thereof
  • A kind of varnish for water-based coil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of epoxy-modified acrylic resin:

[0031] (1) Add 30 parts by weight of ethylene glycol monobutyl ether into the reactor and heat up to 100 ° C, dropwise add 70 parts by weight containing 11% acrylic acid, 7% methacrylic acid, 5% ethyl acrylate, 45% The butyl acrylate, the E-51 epoxy resin of 17%, the hydroxyethyl acrylate of 10%, the mixed monomer of 5% hydroxypropyl acrylate, the addition amount is the weight of mixed monomer 0.3% isopropyl peroxide A mixture of benzene and 0.1% n-butylmercaptan was added dropwise within 5 hours;

[0032] (2) reaction system was incubated for 2 hours, then added cumene peroxide of 0.1 parts by weight, continued to be incubated for 4 hours;

[0033] (3) Subsequently, the temperature of the reaction system is lowered to below 85°C, the pH value is neutralized to 6.5 with ammonia water or an organic amine neutralizer, and finally an appropriate amount of water is added to adjust the solid content to 55%, that is, the epoxy r...

Embodiment 2

[0035] Preparation of epoxy-modified acrylic resin:

[0036](1) Add 50 parts by weight of ethylene glycol monobutyl ether into the reactor and heat up to 120°C, and dropwise add 50 parts by weight of acrylic acid containing 15%, methacrylic acid of 8%, ethyl acrylate of 20%, The mixed monomer of butyl acrylate, 10% E-44 epoxy resin, 9% hydroxyethyl acrylate, 4% hydroxypropyl acrylate, the addition amount is 0.4% isopropyl peroxide of the weight of mixed monomer Benzene and 0.08% n-butyl mercaptan mixed solution, and control the dropwise addition in 6 hours;

[0037] (2) the reaction system was incubated for 2 hours, then added 0.2 parts by weight of cumene peroxide, and continued to be incubated for 3 hours;

[0038] (3) Subsequently, the temperature of the reaction system is lowered to below 70° C., the pH value is neutralized to 6.5 with ammonia water or an organic amine neutralizer, and finally an appropriate amount of water is added to adjust the solid content to 45%.

Embodiment 3

[0040] First take each raw material according to the following raw material proportioning: Example 1 Epoxy-modified acrylic resin 40%, polyester resin 18%, 308 high methylated melamine cross-linking agent 4%, blocked alicyclic polyisocyanate curing agent 5%, propylene glycol ether 0.5%, acrylate leveling agent 0.4%, polyacrylate block copolymer dispersant 0.5%, non-organic silicon defoamer 0.5%, dimethylethanolamine 0.1%, water 31%. Then add the weighed epoxy-modified acrylic resin, polyester resin and water into the high-speed disperser to disperse and stir evenly, and finally add 308 high-etherified melamine crosslinking agent, blocked alicyclic polyisocyanate curing agent, and propylene glycol ether , acrylate leveling agent, polyacrylate block copolymer dispersant, non-organic silicon defoamer and dimethylethanolamine, set the stirring speed to 800r / min, and stir at high speed for 30 minutes to obtain a water-based coil Varnish.

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Abstract

The invention relates to a water-based varnish for roll materials, which comprises the following components in mass percentage: 40-70% of epoxy-modified acrylic resin, 10-30% of polyester resin, 4-15% of high imino resin, sealed Type isocyanate curing agent 3‑6%, cosolvent 0.5‑5%, leveling agent 0.2‑1%, dispersant 0.2‑1%, defoamer 0.2‑1%, neutralizer 0.1‑1%, water 10‑ 41%. The invention also provides a preparation method of the varnish for water-based coils. The varnish for water-based coils of the present invention takes water as a solvent and adds a small amount of co-solvent to the environmentally friendly coating. It has the advantages of: 1) non-flammable, non-explosive, less discharge of organic volatiles (VOC), and environmental protection; 2. ) simple production process, low cost, good leveling, high adhesion, yellowing resistance, high solid content and low viscosity; 3) light color, high clarity and transparency, good gloss and color retention and weather resistance, coating Plump, good heat resistance; 4) Good chemical resistance, stable to acids, alkalis, alcohols, oils, etc. 5) Good dimensional stability and anti-media permeability.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a varnish for water-based coils and a preparation method thereof. Background technique [0002] Ordinary coils are generally made of metal, which has poor weather resistance and corrosion resistance. In order to enhance the weather resistance and corrosion resistance of coil products and prolong their service life, surface treatment of coil materials is usually required. Metal surface treatment technology generally includes painting, electroplating, chemical oxidation, coating technology, etc. The method of using coating technology to treat the metal surface has a long history. The most simple and effective method is to directly apply a suitable coating on the metal surface. After proper rapid high-temperature baking, after the solvent in the coating evaporates, the A dense protective film can be formed on the surface of the metal coil. [0003] At present, metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/10C09D7/65C09D7/20
CPCC08L2201/10C09D163/10C09D7/20C09D7/65C08L67/00
Inventor 邓光万陈志国林秋云
Owner 中山创美涂料有限公司
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