Water-based laminating glue for PVC (polyvinyl chloride) colored white composite film and preparation method of water-based laminating glue

Abstract

The invention relates to the technical field of films, in particular to water-based laminating glue for a PVC (polyvinyl chloride) colored white composite film, which comprises the following components in parts by weight: 20 to 30 parts of EVA (ethylene-vinyl acetate) emulsion, 50 to 60 parts of water-based polyurethane emulsion, 5 to 10 parts of deionized water, 0.1 to 0.5 part of water-based wetting flatting agent and 5 to 6 parts of isocyanate curing agent. Wherein the EVA emulsion is formed by polymerizing extremely-strong non-crystalline vinyl acetate and non-polar crystalline ethylene, the weight ratio of the vinyl acetate to the ethylene is 80: 20, and the polymerization method comprises the following steps: uniformly stirring the EVA emulsion and the waterborne polyurethane emulsion, and then adding deionized water to adjust the viscosity; sequentially adding the water-based wetting leveling agent and the isocyanate curing agent in the step 1, and uniformly stirring. According to the invention, the technical problems of aging resistance, initial stripping force, stripping force after lamination and whole card deformation degree after lamination of the composite glue are solved.

Description

Technical Field

[0001] The invention relates to the technical field of thin films, in particular to an aqueous laminating glue for a PVC color white composite film and a preparation method thereof. Background Art

[0002] The card making materials used in conventional card products are mainly white PVC, because the white base is conducive to the display of printed colors. With the development of the industry, the demand for personalized customization is increasing, and the demand for color cards is growing. The side of ordinary white PVC cards is white, while the side of color cards is colored. Users can distinguish different types of cards in the card package at a glance. The existing solutions have many problems such as poor lamination fastness, lamination deformation, and unstable aging resistance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a water-based laminating glue for PVC color white composite film to solve the above problems.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a water-based laminating glue for PVC color white composite film, the laminating glue comprising the following components in parts by weight:

[0005]

[0006] The EVA emulsion is polymerized by extremely non-crystalline vinyl acetate and non-polar crystalline ethylene, the weight ratio of vinyl acetate to ethylene is 80:20, and the polymerization method is: adding butanone and ethanol to a polymerization tank in sequence under stirring, adding ammonia water to adjust the pH value, then adding vinyl acetate and ammonium sulfate in sequence, and introducing ethylene to generate a polymerization reaction to generate the EVA emulsion; wherein the ratio of butanone to ethanol is (1-5): (1-5).

[0007] As a further embodiment of the present invention, the aqueous polyurethane emulsion is an aliphatic polyurethane aqueous dispersion.

[0008] As a further embodiment of the present invention, the aqueous wetting and leveling agent is a silicone-modified leveling agent.

[0009] As a further embodiment of the present invention, the isocyanate curing agent is HMDI.

[0010] A method for preparing a water-based laminating glue for a PVC color white composite film, the specific steps are as follows:

[0011] Step 1, after the EVA emulsion and the waterborne polyurethane emulsion are uniformly stirred, deionized water is added to adjust the viscosity;

[0012] Step 2: Add water-based wetting and leveling agent and isocyanate curing agent to step 1 in sequence and stir evenly.

[0013] As a further solution of the present invention, in the step 1, the stirring speed is 450-550 r / min, and the viscosity is 20-30s.

[0014] As a further solution of the present invention, the preparation method of the PVC color white composite film is:

[0015] Step 1: Apply water-based laminating glue to one side of the colored PVC by micro-concave coating, and dry it in an oven; Step 2: Use another unwinding machine to unwind the white PVC after it comes out of the oven, and fit it with one side of the colored PVC adhesive layer, and then pass it through a pressure roller to heat and pressurize it so that the glue can fully bond the two layers of PVC, and then rewind it.

[0016] As a further solution of the present invention, in step 1, the drying temperature is 75-78° C. and the time is 120 seconds.

[0017] As a further embodiment of the present invention, the aqueous polyurethane emulsion is an aliphatic polyurethane aqueous dispersion; and the aqueous wetting and leveling agent is an organosilicon-modified leveling agent.

[0018] As a further embodiment of the present invention, the isocyanate curing agent is HMDI.

[0019] Since the present invention adopts the above technical solution, the present invention has the following advantages and positive effects:

[0020] 1. The water-based EVA emulsion used is polymerized with extremely strong non-crystalline vinyl acetate and non-polar crystalline ethylene as basic raw materials, which can greatly improve the aging resistance and is not easy to deform during lamination;

[0021] 2. The thermal activation temperature of water-based polyurethane emulsion is 70-80℃, with good initial thermal viscosity. After reacting with isocyanate curing agent, it can effectively improve the bonding strength and aging resistance, and the lamination will not deform;

[0022] 3. The white PVC is compounded onto the colored PVC by water-based laminating glue, and the technical problems solved are the aging resistance of the compound glue, the initial peeling force, the peeling force after lamination, and the deformation degree of the whole card after lamination. The PVC color-white composite film of the present invention can fully meet the performance requirements. DETAILED DESCRIPTION

[0023] Waterborne polyurethane emulsions were purchased from Siwo Chemicals' U-80X and U-100

[0024] Water-based wetting and leveling agent purchased from TEGO WET-270

[0025] Isocyanate curing agent was purchased from Wanhua Chemical Aquolin 161

[0026]

[0027] Example 1

[0028] The present invention discloses an aqueous laminating glue for a PVC color white composite film, wherein the laminating glue comprises the following components in parts by weight:

[0029]

[0030]

[0031] First, add EVA emulsion and water-based polyurethane emulsion U-80X, stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, finally add water-based wetting and leveling agent, stir evenly, add isocyanate curing agent before use, stir evenly and set aside;

[0032] Apply the prepared water-based laminating glue to one side of the colored PVC by micro-concave coating, and dry at 75-78°C for 120 seconds. After leaving the oven, use another unwinding machine to unwind the white PVC and fit it to one side of the adhesive layer. Then pass through a pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind.

[0033] Example 2

[0034] The present invention discloses an aqueous laminating glue for a PVC color white composite film, wherein the laminating glue comprises the following components in parts by weight:

[0035]

[0036] First, add EVA emulsion and water-based polyurethane emulsion U-80X, stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, finally add water-based wetting and leveling agent, stir evenly, add isocyanate curing agent before use, stir evenly and set aside;

[0037] Apply the prepared water-based laminating glue to one side of the colored PVC by micro-concave coating, and dry at 75-78°C for 120 seconds. After leaving the oven, use another unwinding machine to unwind the white PVC and fit it to one side of the adhesive layer. Then pass through a pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind.

[0038] Example 3

[0039] The present invention discloses an aqueous laminating glue for a PVC color white composite film, wherein the laminating glue comprises the following components in parts by weight:

[0040]

[0041] First, add EVA emulsion and water-based polyurethane emulsion U-80X, stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, finally add water-based wetting and leveling agent, stir evenly, add isocyanate curing agent before use, stir evenly and set aside;

[0042] Apply the prepared water-based laminating glue to one side of the colored PVC by micro-concave coating, and dry at 75-78°C for 120 seconds. After leaving the oven, use another unwinding machine to unwind the white PVC and fit it to one side of the adhesive layer. Then pass through a pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind.

[0043] Comparative Example 1

[0044] A water-based laminating glue for a PVC color white composite film, the laminating glue comprising the following components in parts by weight:

[0045]

[0046] First, add EVA emulsion and water-based polyurethane emulsion U-80X, stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, and finally add water-based wetting and leveling agent, stir evenly for use, without adding isocyanate curing agent; apply the prepared water-based laminating glue on one side of the colored PVC by micro-concave coating, the drying temperature is 75-78℃, the time is 120 seconds, and after coming out of the oven, use another unwinding machine to unwind the white PVC, fit it with one side of the adhesive layer, and then pass through the pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind it.

[0047] Comparative Example 2

[0048] A water-based laminating glue for a PVC color white composite film, the laminating glue comprising the following components in parts by weight:

[0049]

[0050] First, add EVA emulsion AS-980A (low vinyl acetate content) and water-based polyurethane emulsion U-80X, stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, finally add water-based wetting and leveling agent, stir evenly, add isocyanate curing agent before use, stir evenly for standby use; apply the prepared water-based laminating glue to one side of the colored PVC by micro-concave coating, the drying temperature is 75-78℃, the time is 120 seconds, after coming out of the oven, use another unwinding machine to unwind the white PVC, fit it with one side of the adhesive layer, and then pass through the pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind it.

[0051] Comparative Example 3

[0052] A water-based laminating glue for a PVC color white composite film, the laminating glue comprising the following components in parts by weight:

[0053]

[0054]

[0055] First, add EVA emulsion and water-based polyurethane emulsion U-100 (thermal activation temperature 100-110°C), stir evenly at 450-550r / min, then add deionized water to adjust the viscosity to 20-30s, finally add water-based wetting and leveling agent, stir evenly, add isocyanate curing agent before use, stir evenly for standby use; apply the prepared water-based laminating glue to one side of the colored PVC by micro-concave coating, the drying temperature is 75-78°C, the time is 120 seconds, after coming out of the oven, use another unwinding machine to unwind the white PVC, fit it with one side of the adhesive layer, and then pass through the pressure roller to heat and pressurize so that the glue can fully bond the two layers of PVC, and then rewind it.

[0056] Table 1 is the performance test of Examples 1-3 and Comparative Examples 1-3

[0057]

[0058] It can be seen from Table 1 that, compared with Example 1, Comparative Example 1 only lacks the isocyanate curing agent, but it will deform after lamination, and other properties are significantly lower than those of Example 1; compared with Example 2, Comparative Example 2 only has a different EVA emulsion, but the peeling is reduced, and other properties are significantly lower than those of Example 2; compared with Example 3, Comparative Example 3 only has a different aqueous polyurethane emulsion, but the initial peel strength is significantly reduced, and other properties are lower than those of Example 3; In summary, the present invention effectively improves the bonding strength and aging resistance, and does not deform after lamination.

[0059] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A water-based laminating glue for PVC color white composite film, characterized by: The laminating glue comprises the following components in parts by weight: EVA emulsion 20-30 parts 50-60 parts of water-based polyurethane emulsion 5-10 parts deionized water 0.1-0.5 parts of water-based wetting and leveling agent 5-6 parts of isocyanate curing agent; The EVA emulsion is polymerized by extremely non-crystalline vinyl acetate and non-polar crystalline ethylene, the weight ratio of vinyl acetate to ethylene is 80:20, and the polymerization method is as follows: under stirring, butanone and ethanol are sequentially added to a polymerization tank, ammonia water is added to adjust the pH value, vinyl acetate and ammonium sulfate are sequentially added, and ethylene is introduced to undergo polymerization reaction to generate the EVA emulsion; wherein the ratio of butanone to ethanol is (1-5): (1-5).

2. The aqueous laminating glue for PVC color white composite film according to claim 1 is characterized by: The aqueous polyurethane emulsion is an aliphatic polyurethane aqueous dispersion.

3. The aqueous laminating glue for PVC color white composite film according to claim 1 is characterized by: The water-based wetting and leveling agent is a silicone-modified leveling agent.

4. The aqueous laminating glue for PVC color white composite film according to claim 1, characterized in that: The isocyanate curing agent is HMDI.

5. A method for preparing a water-based laminating glue for a PVC color white composite film according to any one of claims 1 to 4, characterized in that: Specific steps as follows: Step 1, after the EVA emulsion and the waterborne polyurethane emulsion are uniformly stirred, deionized water is added to adjust the viscosity; Step 2: Add water-based wetting and leveling agent and isocyanate curing agent to step 1 in sequence and stir evenly.

6. The method for preparing a PVC color white composite film using an aqueous laminating glue according to claim 5, characterized in that: The stirring speed in the step 1 is 450-550 r / min, and the viscosity is 20-30s.

7. The method for preparing a PVC color white composite film using an aqueous laminating glue according to claim 5, characterized in that: The preparation method of the PVC color white composite film is: Step 1: Apply water-based laminating glue to one side of the colored PVC by micro-concave coating, and dry in an oven; Step 2: After coming out of the oven, use another unwinding machine to unwind the white PVC and fit it with the colored PVC adhesive layer. Then, the machine heats and presses it with a pressure roller so that the glue can fully bond the two layers of PVC, and then rewinds it.

8. The aqueous laminating glue for PVC color white composite film and the preparation method thereof according to claim 7, characterized in that: In the step 1, the drying temperature is 75-78° C. and the drying time is 120 seconds.

9. The method for preparing a water-based laminating glue for a PVC color white composite film according to claim 5, characterized in that: The water-based polyurethane emulsion is an aliphatic polyurethane aqueous dispersion; the water-based wetting and leveling agent is an organosilicon-modified leveling agent.

10. The method for preparing a PVC color white composite film using an aqueous laminating glue according to claim 5, characterized in that: The isocyanate curing agent is HMDI.

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