阅读说明：本技术 一种耐热性较好适合uv胶印的高柔韧性水性清漆 (High-flexibility water-based varnish with good heat resistance and suitable for UV offset printing ) 是由 余桂强 褚波 于 2019-09-26 设计创作，主要内容包括：本申请是申请号为2017100265557发明的分案申请,本发明公开了一种耐热性较好适合UV胶印的高柔韧性水性清漆,其技术方案要点是由以下重量组分的物质组成：纯丙乳液10～20％,丙烯酸改性水性聚氨酯乳液5～15％,自交联丙烯酸分散剂35～55％,水10～25％,醇类溶剂10～25％,水性助剂0.1～5％；本发明提供一种耐热性较好适合UV胶印的高柔韧性水性清漆。(The invention discloses a high-flexibility water-based varnish with better heat resistance and suitable for UV offset printing, which is a divisional application with the application number of 2017100265557 and adopts the technical scheme that the varnish consists of the following components in parts by weight: 10-20% of pure acrylic emulsion, 5-15% of acrylic acid modified waterborne polyurethane emulsion, 35-55% of self-crosslinking acrylic acid dispersing agent, 10-25% of water, 10-25% of alcohol solvent and 0.1-5% of water-based auxiliary agent; the invention provides a high-flexibility water-based varnish with good heat resistance and suitable for UV offset printing.)

1. A high-flexibility water varnish with better heat resistance and suitable for UV offset printing is characterized by comprising the following components in parts by weight:

the acrylic acid modified waterborne polyurethane emulsion is a composite emulsion prepared by copolymerization reaction of methyl methacrylate, butyl acrylate and waterborne polyurethane, the minimum film forming temperature of the self-crosslinking acrylic acid dispersing agent is less than 20 ℃, the particle size is 60-90 nm, the solid content is 40-45%, and the water is deionized water or distilled water.

2. The high-flexibility water-based varnish with good heat resistance suitable for UV offset printing as claimed in claim 1, wherein: the pure acrylic emulsion has the glass transition temperature of 90-105 ℃, the minimum film forming temperature of more than 80 ℃, the particle size of 80-120 nm and the solid content of 43-45%.

3. The high-flexibility water-based varnish with good heat resistance suitable for UV offset printing as claimed in claim 1, wherein: the pure acrylic emulsion is an emulsion prepared by copolymerizing a plurality of acrylic acid, methacrylic acid, methyl methacrylate, acrylic esters and functional auxiliaries through an optimized process.

4. The high-flexibility water-based varnish with good heat resistance suitable for UV offset printing as claimed in claim 1, wherein: the alcohol solvent is one or more of ethanol, isopropanol and n-butanol.

5. The high-flexibility water-based varnish with good heat resistance suitable for UV offset printing as claimed in claim 1, wherein: the water-based auxiliary agent comprises a defoaming agent formed by one or more of polyether siloxane copolymer emulsion, organic modified polysiloxane emulsion, polysiloxane and high-carbon alcohol, a leveling agent formed by one or more of polyether modified organic silicon, polysiloxane-polyether copolymer emulsion and modified silicone, and an anti-scratching agent formed by one or more of polydimethylsiloxane dispersoid, high-molecular modified siloxane solution, silicone polymer, polyether modified organic silicon and polyethylene emulsifying wax.

[ technical field ] A method for producing a semiconductor device

The invention relates to a high-flexibility water-based varnish with good heat resistance and suitable for UV offset printing, belonging to the technical field of resin coatings.

[ background of the invention ]

In the field of packaging card paper printing such as cigarette packaging, wine box packaging, food packaging, medicine packaging, cosmetic packaging and the like, the used card paper is usually made into a composite card paper by adhering an aluminum foil and an aluminum-plated film to the surfaces of various card papers; in order to improve the quality and application field of the composite paperboard, improve the printing adaptability of the composite paperboard and protect aluminum atoms from oxidative discoloration, a layer of varnish is generally coated on the surfaces of an aluminum foil and an aluminum-plated film.

In recent years, as the main diluents of the water-based varnish in the production and preparation process are water and ethanol, the product has low VOC content, is environment-friendly and meets the national and local environmental protection requirements; the varnish is the varnish for coating the surface of the composite paperboard which is most popular and used in the largest amount in recent years.

The UV ink is free of solvent, high in drying speed, good in gloss, bright in color, water-resistant, solvent-resistant and good in wear resistance. The UV printing ink becomes a mature printing ink technology, the pollutant discharge is almost zero, and the national and local environmental protection requirements are met; high speed UV offset printing is increasingly becoming the mainstream of printing.

The common water-based varnish is generally made to be harder in consideration of the heat resistance of a paint film, so that UV ink is easy to burst when a printed product is required to be subjected to edge folding, embossing and bump pressing, the printed product is scrapped, and the application of the water-based varnish is limited.

Aiming at the UV ink bursting situation which occurs when paper is folded, embossed and embossed after the existing water-based varnish is printed with UV offset printing ink, a high-flexibility water-based varnish suitable for UV offset printing ink printing needs to be developed.

[ summary of the invention ]

The invention aims to overcome the defects of the existing water-based varnish and provide a water-based varnish which has high flexibility and is suitable for UV offset printing ink printing.

The invention also aims to provide a preparation method of the high-flexibility water-based varnish with better heat resistance and suitable for UV offset printing.

In order to achieve the purpose, the invention adopts the following technical scheme:

a high-flexibility water varnish with better heat resistance and suitable for UV offset printing is composed of the following components in parts by weight:

preferably, the glass transition temperature of the acrylic emulsion is 90-105 ℃, the lowest film forming temperature is more than 80 ℃, the particle size is 80-120 nm, and the solid content is 43-45%.

Preferably, the pure acrylic emulsion is an emulsion prepared by copolymerizing a plurality of acrylic acid, methacrylic acid, methyl methacrylate, acrylates and functional auxiliaries through an optimized process.

Preferably, the acrylic modified polyurethane emulsion is a composite emulsion prepared by copolymerization reaction of methyl methacrylate, butyl acrylate and waterborne polyurethane.

Preferably, the water is deionized water or distilled water.

Preferably, the minimum film-forming temperature of the self-crosslinking acrylic acid dispersant is less than 20 ℃, the particle size is 60-90 nm, and the solid content is 40-45%.

Preferably, the alcohol solvent is one or a mixture of ethanol, isopropanol and n-butanol.

Preferably, the aqueous auxiliary agent comprises a defoaming agent formed by one or more of polyether siloxane copolymer emulsion, organic modified polysiloxane emulsion, polysiloxane and higher alcohol, a leveling agent formed by one or more of polyether modified organic silicon, polysiloxane-polyether copolymer emulsion and modified silicone, and an anti-scratching agent formed by one or more of polydimethylsiloxane dispersion, high-molecular modified siloxane solution, silicone polymer, polyether modified organic silicon and polyethylene emulsifying wax.

A preparation method of a high-flexibility water-based varnish with better heat resistance and suitable for UV offset printing comprises the following steps:

1) preparing a component A: adding the pure acrylic emulsion, the acrylic acid modified waterborne polyurethane emulsion and the self-crosslinking acrylic acid dispersing agent into a dispersing cylinder according to the proportion, and stirring for 15 minutes at the rotating speed of 200 revolutions per minute to prepare a component A;

2) preparing a component B: adding deionized water, an alcohol solvent and a water-based auxiliary agent into a stirring cylinder according to a proportion, and stirring at a rotating speed of 300 revolutions per minute for 15 minutes to prepare a component B;

3) mixing: pumping the uniformly stirred component B into a dispersion cylinder, mixing with the component A, and stirring at the rotating speed of 200 revolutions per minute for 15 minutes;

4) filtering, purifying and packaging: impurities are removed through a filtering device, and the high-flexibility water-based varnish with better heat resistance and suitable for UV offset printing is obtained.

Compared with the prior art, the invention has the following advantages:

1. the high-flexibility water-based varnish with good heat resistance is suitable for UV offset printing, and the selected self-crosslinking acrylic acid dispersant has excellent recoatability and good adhesion with UV offset printing ink; and can provide excellent interlayer adhesion, namely, the adhesive has excellent adhesion to the substrate and the printed UV ink;

2. the high-flexibility water-based varnish with good heat resistance and suitable for UV offset printing can provide better flexibility by using the selected acrylic acid modified water-based polyurethane emulsion, and can prevent the ink from bursting when the processes of folding, embossing, bump stamping and the like are carried out after the UV ink is printed;

3. the high-flexibility water-based varnish has better heat resistance and is suitable for UV offset printing, the used diluent is water and an alcohol solvent, the varnish is non-toxic and non-pollution, the VOC emission is low, no adverse effect is caused on human bodies and the environment, and the varnish meets the requirements of national and industrial environmental protection standards.

[ detailed description ] embodiments

The invention is further described below with reference to specific examples: