CN-117757315-B - Isolation coating for hot-melt pressure-sensitive adhesive and preparation method thereof

Abstract

The invention relates to the technical field of isolating layer coatings, in particular to an isolating coating for a hot-melt pressure-sensitive adhesive and a preparation method thereof. The invention provides a release coating for a hot-melt pressure-sensitive adhesive, which is prepared from, by mass, 100 parts of a release agent, 50-1000 parts of water, 0.2-0.8 part of a defoaming agent, 0.2-1.5 parts of a lubricant, 0-1 part of an antiskinning agent, 0-2 parts of a bridging agent and 0.1-1 part of a wetting agent, wherein the release agent comprises polyvinyl alcohol or aqueous emulsion. The isolating coating can avoid the problem that the film generates a warping mark.

Inventors

• LI YAOLIN
• YANG ZHI
• YAO XINPING
• Du zhongtai
• FANG TENG
• LI BO
• LIU AO

Assignees

• 河北方大新材料股份有限公司

Dates

Publication Date

20260508

Application Date

20231220

Claims (6)

1. 1. The application of a release coating is characterized in that the release coating is used for preventing the contact between chemical substances in a thermal-insulation melt pressure-sensitive adhesive and a film; The preparation raw materials of the isolation coating comprise, by mass, 100 parts of an isolating agent, 566 parts of water, 0.2-0.8 part of a defoaming agent, 0.2-1.5 parts of a lubricant, 0-1 part of an antiskinning agent, 2 parts of a bridging agent and 0.1-1 part of a wetting agent; the isolating agent is polyvinyl alcohol; the bridging agent comprises polyethyleneimine; the antiskinning agent is used in an amount other than 0.
2. 2. The use according to claim 1, wherein the defoamer comprises one or more of a modified silicone, a mineral oil and an alkynol; The lubricant comprises stearate and/or wax emulsion; The antiskinning agent comprises one or more of methyl ethyl ketone oxime, o-methoxyphenol, o-isopropylphenol, cyclohexanone oxime and acetone oxime; the wetting agent comprises one or more of alkynol wetting agents, organic silicon wetting agents and sodium sulfonate wetting agents.
3. 3. The use according to claim 1 or 2, wherein the method of preparing the barrier coating comprises: after the water and the release agent are mixed firstly, heating and cooling are carried out firstly, and then the mixture is mixed with the defoamer, the lubricant, the wetting agent, the antiskinning agent and the bridging agent under the stirring condition for the second time, so as to obtain a first coating; And coating the first coating on the surface of the film to obtain the isolation coating.
4. 4. The use according to claim 1 or 2, wherein the method of preparing the barrier coating comprises: Thirdly mixing part of water and a bridging agent, and coating the mixture on the surface of the film to prepare a precoated film; Fourth mixing the residual water, polyvinyl alcohol, a defoaming agent, a lubricant, a wetting agent and an antiskinning agent to obtain a second coating; and coating the second coating on the surface of the precoating film to obtain the isolation coating.
5. 5. The use according to claim 3, wherein the first mixing is carried out under first stirring conditions, the rotational speed of the first stirring being 50-100 r/min; The temperature after the temperature rise is 90 ℃, and the heat preservation time is 1h; the second mixing is carried out under the condition of second stirring, and the rotating speed of the second stirring is 200r/min; And the second mixing is to sequentially add an antifoaming agent, a lubricant, a wetting agent, an antiskinning agent and a bridging agent into the mixed solution obtained after the first mixing.
6. 6. The use according to claim 4, wherein the third mixing is carried out under a third stirring condition, the rotation speed of the third stirring being 50-100 r/min; The gram weight of the coating is 0.1-0.2 g/m 2 ; and the fourth mixing is that after the water and the release agent are mixed in the sixth way, the temperature is raised to 90 ℃ and then is lowered, and then the defoaming agent, the lubricating agent, the wetting agent and the antiskinning agent are added in sequence under the stirring condition.

Description

Isolation coating for hot-melt pressure-sensitive adhesive and preparation method thereof Technical Field The invention relates to the technical field of isolating layer coatings, in particular to an isolating coating for a hot-melt pressure-sensitive adhesive and a preparation method thereof. Background The hot melt pressure sensitive adhesive is one of pressure sensitive adhesives, and is prepared through mixing synthetic rubber, resin, rubber oil, etc. and heating to form molten state, and coating on cotton, cloth or plastic film. The packaging box is mainly used for various box seals, paper product packages, beverage bottle labels, sealing aluminum foils, waterproof coiled materials, express face sheets, flexible packages, other packaging and environment-friendly paper pallets and the like, and is suitable for various materials. However, the existing hot-melt pressure-sensitive adhesive can produce a swelling effect on the film, so that the problem of label warping after labeling of the final film label is caused, and the requirement cannot be met. Disclosure of Invention The invention aims to provide a release coating for a hot-melt pressure-sensitive adhesive and a preparation method thereof, and the release coating can avoid the problem that a film generates a warping mark. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a release coating for a hot-melt pressure-sensitive adhesive, which is prepared from, by mass, 100 parts of release agent, 500-1000 parts of water, 0.2-0.8 part of defoamer, 0.2-1.5 parts of lubricant, 0-1 part of antiskinning agent, 0-2 parts of bridging agent and 0.1-1 part of wetting agent; The release agent comprises polyvinyl alcohol or an aqueous emulsion. Preferably, the aqueous emulsion comprises one or more of acrylic emulsion, polyurethane emulsion, epoxy emulsion and polyester emulsion. Preferably, when the isolating agent is an aqueous emulsion, the anti-skinning agent is used in an amount of 0, and the water is used in an amount of 50-70 parts. Preferably, the defoamer comprises one or more of modified organic silicon, mineral oil and alkynol; The lubricant comprises stearate and/or wax emulsion; The antiskinning agent comprises one or more of methyl ethyl ketoxime, o-methoxyphenol, o-isopropylphenol, methyl ethyl ketone ester, butyraldehyde ester, cyclohexanone palate and acetone oxime; The bridging agent comprises polyethyleneimine and/or a silane coupling agent; the wetting agent comprises one or more of alkynol wetting agents, organic silicon wetting agents and sodium sulfonate wetting agents. The invention also provides a preparation method of the coating, when the release agent comprises polyvinyl alcohol, the preparation method of the release coating comprises the following steps: after the water and the release agent are mixed firstly, heating and cooling are carried out firstly, and then the mixture is mixed with the defoamer, the lubricant, the wetting agent, the antiskinning agent and the bridging agent under the stirring condition for the second time, so as to obtain a first coating; And coating the first coating on the surface of the original film to obtain the isolation coating. The invention also provides a preparation method of the coating, when the release agent comprises polyvinyl alcohol, the preparation method of the release coating comprises the following steps: Thirdly, mixing part of water and a bridging agent, and coating the mixture on the surface of the original film to prepare a precoating film; Fourth mixing the residual water, polyvinyl alcohol, a defoaming agent, a lubricant, a wetting agent and an antiskinning agent to obtain a second coating; and coating the second coating on the surface of the precoating film to obtain the isolation coating. The invention also provides a preparation method of the coating, when the release agent comprises aqueous emulsion, the preparation method of the release coating comprises the following steps: fifth mixing water, a release agent, a defoaming agent, a lubricant, a wetting agent, a bridging agent and an antiskinning agent to obtain a third coating; and coating the third coating on the surface of the original film to obtain the isolation coating. Preferably, the first mixing is performed under the condition of first stirring, and the rotating speed of the first stirring is 50-100 r/min; The temperature after the temperature rise is 90 ℃, and the heat preservation time is 1h; the second mixing is carried out under the condition of second stirring, and the rotating speed of the second stirring is 200r/min; And the second mixing is to sequentially add an antifoaming agent, a lubricant, a wetting agent, an antiskinning agent and a bridging agent into the mixed solution obtained after the first mixing. Preferably, the third mixing is performed under a third stirring condition, and the rotation speed of the third stirring is 50-100