An aqueous base glue for a polymer polyvinyl chloride film, a preparation method thereof, and an application thereof

Abstract

The present invention discloses an aqueous primer for a polymer polyvinyl chloride film, a preparation method thereof, and an application thereof in a PVC wire harness tape. The aqueous primer comprises components A, B, and C. By weight, it comprises: 44-65 parts of component A, 35-56 parts of component B, and 2.7-4 parts of component C; Component A: an acrylic synthetic emulsion prepared by emulsion copolymerization of monomers such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, styrene, acrylonitrile, methacrylic acid, acrylic acid, 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate, ethyl acrylate, vinyl acetate, etc. Component B: at least one of natural rubber latex, synthetic rubber latex, and their modified latexes. Component C: an auxiliary agent. The auxiliary agent is mainly composed of a wetting agent, an antifoaming agent, etc. Compared with the current oil-based primer, the aqueous primer uses water as the main solvent, does not contain organic solvents, is environmentally friendly, and is not flammable because the main component is water, making it safer to use.

Description

Technical Field

[0001] The present invention relates to the technical field of water-based adhesives, and particularly to a water-based primer for a polymer polyvinyl chloride film, a preparation method thereof, and an application thereof in a PVC wire harness tape. Background Art

[0002] At present, solvent-based rubber primer adhesives are mainly used for soft PVC pressure-sensitive tapes. Solvent-based primers have high VOC emissions and can cause environmental pollution. Water-based pressure-sensitive adhesives are non-toxic, pollution-free, low-cost, and have a long pot life. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a water-based primer for a polymer polyvinyl chloride film, its preparation and application, so as to solve the problems raised in the above technical background.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0005] The present invention relates to an environmentally friendly low-VOC water-based primer. This pressure-sensitive adhesive can replace part of the solvent-based primer to prepare PVC tapes and is applied to polymer polyvinyl chloride films (PVC polymer films). This low-VOC water-based primer reduces solvent volatilization, is pollution-free to the environment, replaces traditional oil-based primers, and can achieve a good balance in bonding between the substrate and the surface adhesive.

[0006] In the first aspect, the present invention provides a water-based primer for a polymer polyvinyl chloride film. The water-based primer comprises components A, B, and C. Component A: acrylic synthetic emulsion; B: natural rubber emulsion, synthetic rubber emulsion, etc.; C: additives.

[0007] Component A: acrylic synthetic emulsion, which is prepared by emulsion copolymerization of any several monomers selected from methyl methacrylate, ethyl methacrylate, butyl methacrylate, styrene, acrylonitrile, methacrylic acid, acrylic acid, 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate, ethyl acrylate, and vinyl acetate.

[0008] Component B: at least one of natural rubber emulsion, synthetic rubber emulsion (such as styrene-butadiene rubber latex) and their modified latexes (such as carboxylated styrene-butadiene latex).

[0009] Component C: additives. The additives mainly consist of wetting agents, defoaming agents, etc. The wetting agent mainly reduces the surface tension of the primer and improves the wetting ability of the water-based primer on the substrate. Without a wetting agent, the water-based primer cannot spread on the substrate, which is not conducive to the coating performance of the water-based primer. The defoaming agent mainly eliminates and prevents the generation of foam, can reduce the surface tension of the liquid, thereby reducing the solubility of gas in the liquid, and further reducing or eliminating the formation of bubbles, which is beneficial to the coating performance of the water-based primer.

[0010] In the second aspect, the present invention provides a preparation method of the above-mentioned aqueous primer for polymer polyvinyl chloride film, comprising the following steps:

[0011] S1. Synthesis of component A: Add 100 g of isooctyl acrylate, 80 g of vinyl acetate, 1.5 g of acrylic acid and 1.5 g of methacrylic acid, or add 35 g of isooctyl acrylate, 65 g of butyl acrylate, 20 g of vinyl acetate, 60 g of methyl methacrylate, 1.5 g of acrylic acid and 1.5 g of methacrylic acid to 50 g of deionized water dissolved with 0.6 g of buffer sodium bicarbonate, 2.0 g of emulsifier sodium dodecyl sulfate (SDS), and 2.0 g of OP-10. Pre-emulsify to obtain a milky white milk-like pre-emulsion through mechanical stirring.

[0012] In a four-necked flask equipped with a mechanical stirrer, a condenser, a constant pressure funnel, and a thermometer, add 115 g of deionized water and 0.4 g of initiator ammonium persulfate. Heat the water bath to 80 °C, and use the constant pressure funnel to dropwise add the well-stirred pre-emulsion. Finish dropping within 3 - 4 hours. After dropping, continue to keep the temperature for reaction for 2 h. After cooling to room temperature, discharge to obtain component A.

[0013] S2. Preparation of aqueous primer: Mix 44 - 65 g of component A and 35 - 56 g of component B, stir evenly, then add 2.7 - 4 g of component C. In component C, there are 2.5 - 3.5 g of wetting agent WET250 and 0.2 - 1 g of defoaming agent TEGO1495. Continue to stir and add 22 g of deionized water, and stir evenly to obtain the aqueous primer.

[0014] In the third aspect, the present invention provides the application of the above-mentioned aqueous primer for polymer polyvinyl chloride film in PVC wire harness tapes.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Compared with the current oily primer, the aqueous primer uses water as the main solvent, does not contain organic solvents, is environmentally friendly, and is not flammable because the main component is water, so it is safer during use.

[0017] 2. The water-based primer of the present invention contains 44-65 parts of component A and 35-56 parts of component B. At the same time, component A is defined as an acrylic synthetic emulsion, which is prepared by emulsion copolymerization of any several monomers selected from methyl methacrylate, ethyl methacrylate, butyl methacrylate, styrene, acrylonitrile, methacrylic acid, acrylic acid, 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate, ethyl acrylate, and vinyl acetate; when component B is at least one of natural rubber latex, synthetic rubber latex (such as styrene-butadiene rubber latex), and their modified latexes (such as carboxylated styrene-butadiene latex), its coating performance and adhesion performance are more excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the first physical picture of the water-based primer in Example 1;

[0019] Figure 2 It is the second physical picture of the water-based primer in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following examples and the features in the examples can be combined with each other.

[0021] Except for the following models, the raw materials in the present invention are all common materials on the market. Without special declaration, the specific source manufacturers are not specified.

[0022] Natural rubber latex, imported from Thailand;

[0023] Styrene-butadiene rubber latex, Sumitomo DL395PA;

[0024] Wetting agent WET250, Degussa, Germany;

[0025] Defoaming agent TEGO1495, Degussa, Germany.

[0026] Example 1:

[0027] A water-based primer for a polymer polyvinyl chloride film, and its preparation method is as follows:

[0028] S1. Synthesis of Component A: 100 g of isooctyl acrylate, 80 g of vinyl acetate, 1.5 g of acrylic acid, 1.5 g of methacrylic acid and other monomers are added to 50 g of deionized water dissolved with 0.6 g of buffer sodium bicarbonate, 2.0 g of emulsifier sodium dodecyl sulfate (SDS), and 2.0 g of OP-10. A milky white milk-like pre-emulsion is obtained by mechanical stirring for pre-emulsification. In a four-necked flask equipped with a mechanical stirrer, a condenser, a constant pressure funnel, and a thermometer, 115 g of deionized water and 0.4 g of initiator ammonium persulfate are added, heated in a water bath to 80 °C, and the well-stirred pre-emulsion is added dropwise using a constant pressure funnel. The addition is completed within 3 - 4 hours. After the addition, continue to keep the temperature for reaction for 2 h, cool to room temperature and then discharge to obtain Component A.

[0029] S2. Add 44 g of Component A and 56 g of Component B (natural rubber latex), mix and stir evenly, then add 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 in Component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous base glue, as Figure 1 and Figure 2 shown.

[0030] The aqueous base glue prepared in this example is coated on a polymer PVC film, dried, and then coated with the currently used solvent-based rubber pressure-sensitive adhesive with a dry glue thickness of 0.013 mm to make a pressure-sensitive adhesive tape. The peeling performance of the tape is detected according to the national standard GB / T2792 - 2014, and the degumming situation of the tape is observed by tensile test.

[0031] Example 2:

[0032] A preparation method of an aqueous base glue for a polymer polyvinyl chloride film is as follows:

[0033] S1. The synthesis method of Component A is the same as that in Example 1;

[0034] S2. Add 65 g of Component A and 35 g of Component B (natural rubber latex), mix and stir evenly, then add 2.5 g of wetting agent WET250 and 1.0 g of defoaming agent TEGO1495 in Component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous base glue.

[0035] The aqueous base glue prepared in this example is coated on a polymer PVC film, dried, and then coated with the currently used solvent-based rubber pressure-sensitive adhesive with a dry glue thickness of 0.013 mm to make a pressure-sensitive adhesive tape. The peeling performance of the tape is detected according to the national standard GB / T2792 - 2014, and the degumming situation of the tape is observed by tensile test.

[0036] Example 3:

[0037] A preparation method of an aqueous base glue for a polymer polyvinyl chloride film is as follows:

[0038] S1. The synthesis method of Component A is the same as that in Example 1;

[0039] S2. Add 55 g of Component A and 45 g of Component B (natural rubber latex), mix and stir evenly, then add 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 in Component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous primer.

[0040] Coat the aqueous primer prepared in this example on a polymer PVC film, dry it, and then coat the currently used solvent-based rubber pressure-sensitive adhesive with a dry adhesive thickness of 0.013 mm to make a pressure-sensitive adhesive tape. Test the peeling performance of the tape according to the national standard GB / T2792-2014, and check the degumming situation of the tape during tensile testing.

[0041] Example 4:

[0042] An aqueous primer for polymer polyvinyl chloride film, and its preparation method is as follows:

[0043] S1. Synthesis of Component A: Add 35 g of isooctyl acrylate, 65 g of butyl acrylate, 20 g of vinyl acetate, 60 g of methyl methacrylate, 1.5 g of acrylic acid, 1.5 g of methacrylic acid and other monomers into 50 g of deionized water dissolved with 0.6 g of buffer sodium bicarbonate, 2.0 g of emulsifier sodium dodecyl sulfate (SDS), and 2.0 g of OP-10, and pre-emulsify through mechanical stirring to obtain a milky white milk-like pre-emulsion. In a four-necked flask equipped with a mechanical stirrer, a condenser, a constant pressure funnel, and a thermometer, add 115 g of deionized water and 0.4 g of initiator ammonium persulfate, heat the water bath to 80 °C, and drip the well-stirred pre-emulsion with a constant pressure funnel, finish dripping within 3 - 4 hours, continue to keep the temperature for reaction for 2 h after dripping, cool to room temperature and then discharge to obtain Component A.

[0044] S2. Add 44 g of Component A and 56 g of Component B (natural rubber latex), mix and stir evenly, then add 3.5 g of wetting agent WET250 and 0.5 g of defoaming agent TEGO1495 in Component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous primer.

[0045] Coat the aqueous primer prepared in this example on a polymer PVC film, dry it, and then coat the currently used solvent-based rubber pressure-sensitive adhesive with a dry adhesive thickness of 0.013 mm to make a pressure-sensitive adhesive tape. Test the peeling performance of the tape according to the national standard GB / T2792-2014, and check the degumming situation of the tape during tensile testing.

[0046] Example 5:

[0047] An aqueous primer for polymer polyvinyl chloride film, and its preparation method is as follows:

[0048] S1. The synthesis method of component A is the same as that in Example 4;

[0049] S2. Take 55 g of component A and 45 g of component B (styrene-butadiene rubber latex), mix and stir evenly, then add 3.5 g of wetting agent WET250 and 0.3 g of defoaming agent TEGO1495 to component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous base adhesive.

[0050] Coat the aqueous base adhesive prepared in this example on a high molecular weight PVC film, dry it, and then coat the currently used solvent-based rubber pressure-sensitive adhesive with a dry adhesive thickness of 0.013 mm to make a pressure-sensitive adhesive tape. Detect the peeling performance of the tape according to the national standard GB / T2792-2014, and check the degumming situation of the tape by tensile test.

[0051] Comparative Example 1:

[0052] An aqueous base adhesive for high molecular weight polyvinyl chloride film, and its preparation method is as follows:

[0053] S1. The synthesis method of component A is the same as that in Example 1;

[0054] S2. Take 80 g of component A and 20 g of component B (natural rubber latex), mix and stir evenly, then add 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 to component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous base adhesive.

[0055] Coat the aqueous base adhesive prepared in this example on a high molecular weight PVC film, dry it, and then coat the currently used solvent-based rubber pressure-sensitive adhesive with a dry adhesive thickness of 0.013 mm to make a pressure-sensitive adhesive tape. Detect the peeling performance of the tape according to the national standard GB / T2792-2014, and check the degumming situation of the tape by tensile test.

[0056] Comparative Example 2:

[0057] An aqueous base adhesive for high molecular weight polyvinyl chloride film, and its preparation method is as follows:

[0058] S1. The synthesis method of component A is the same as that in Example 1;

[0059] S2. Take 90 g of component A and 10 g of component B (natural rubber latex), mix and stir evenly, then add 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 to component C, continue to stir and add 22 g of deionized water, and stir evenly to obtain an aqueous base adhesive.

[0060] The water-based primer prepared in this example was coated on a polymer PVC film, dried, and then the currently used solvent-based rubber pressure-sensitive adhesive was applied. The dry adhesive thickness was 0.013 mm to make a pressure-sensitive adhesive tape. The peeling performance of the tape was tested according to the national standard GB / T 2792-2014, and the degumming situation of the tape was observed under tensile stress.

[0061] Comparative Example 3:

[0062] A water-based primer for polymer polyvinyl chloride film, and its preparation method is as follows:

[0063] S1. The synthesis method of component A is the same as that in Example 1;

[0064] S2. 10 g of component A and 80 g of component B (natural rubber latex) were mixed and stirred evenly, then added to component C, with 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 added. Stirring was continued and 22 g of deionized water was added. After stirring evenly, a water-based primer was obtained.

[0065] The water-based primer prepared in this example was coated on a polymer PVC film, dried, and then the currently used solvent-based rubber pressure-sensitive adhesive was applied. The dry adhesive thickness was 0.013 mm to make a pressure-sensitive adhesive tape. The peeling performance of the tape was tested according to the national standard GB / T 2792-2014, and the degumming situation of the tape was observed under tensile stress.

[0066] Comparative Example 4:

[0067] A water-based primer for polymer polyvinyl chloride film, and its preparation method is as follows:

[0068] S1. The synthesis method of component A is the same as that in Example 1;

[0069] S2. 15 g of component A and 85 g of component B (natural rubber latex) were mixed and stirred evenly, then added to component C, with 2.5 g of wetting agent WET250 and 0.2 g of defoaming agent TEGO1495 added. Stirring was continued and 22 g of deionized water was added. After stirring evenly, a water-based primer was obtained.

[0070] The water-based primer prepared in this example was coated on a polymer PVC film, dried, and then the currently used solvent-based rubber pressure-sensitive adhesive was applied. The dry adhesive thickness was 0.013 mm to make a pressure-sensitive adhesive tape. The peeling performance of the tape was tested according to the national standard GB / T 2792-2014, and the degumming situation of the tape was observed under tensile stress.

[0071] Comparative Example 5:

[0072] Apply the oil-based primer used by our company (Grade A primer, self-produced by Shushi Group Co., Ltd.) on the polymer PVC film, dry it, and then apply the currently used solvent-based rubber pressure-sensitive adhesive (Y101 surface adhesive, self-produced by Shushi Group Co., Ltd.). The dry adhesive thickness is 0.013 mm to make a pressure-sensitive adhesive tape. Detect the peeling performance of the tape according to the national standard GB / T2792-2014, and check the degumming situation of the tape during tensile testing.

[0073] The performance comparison of the primers in Examples 1-5 and Comparative Examples 1-5 is shown in Table 1 and Table 2.

[0074] Table 1

[0075] Project Example 1 Example 2 Example 3 Example 4 Example 5 Coating performance Good wettability Good wettability Good wettability Good wettability Good wettability 180° peel strength 2.10 1.95 1.96 2.39 2.20 Adhesive performance of tape No degumming No degumming No degumming No degumming No degumming

[0076] Table 2

[0077] Project Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Coating performance Poor wettability Good wettability Poor wettability Good wettability Good wettability 180° peel strength 1.10 1.21 1.12 1.30 2.06 Adhesive performance of tape Degumming phenomenon No degumming Degumming phenomenon Degumming phenomenon No degumming

[0078] As can be seen from Table 1 and Table 2, the water-based primers obtained in Examples 1-5 have excellent adhesion performance on the polymer polyvinyl chloride film. Comparing Examples 1-3 with Comparative Examples 1-4, when the water-based primer of the present invention contains 44-65 parts of component A and 35-56 parts of component B, the comprehensive effect of its coating performance and adhesion performance is significantly better than that outside the range of 44-65 parts of component A and outside the range of 35-56 parts of component B in the water-based primer. Comparing Examples 1-3 with Comparative Example 5, it can be seen that the performance of the water-based primer obtained in the present invention is comparable to that of the oil-based primer. However, the water-based primer uses water as the main solvent, does not contain organic solvents, is environmentally friendly, and is not flammable because the main component is water, so it is safer during use.

[0079] The above-described embodiments only represent the specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A water-based primer for a polymer polyvinyl chloride film, characterized in that: The raw materials are comprised of the following parts by weight: 44-65 parts of component A, 35-56 parts of component B, and 2.7-4 parts of component C; Wherein, the component A is an acrylic synthetic emulsion; the component B is at least one of natural rubber emulsion, styrene-butadiene rubber emulsion and carboxyl styrene-butadiene latex; the component C is an auxiliary agent; The method for preparing the aqueous primer for the polymer polyvinyl chloride film comprises the following steps: S1. Synthesis of component A: 100 g of isooctyl acrylate, 80 g of vinyl acetate, 1.5 g of acrylic acid and 1.5 g of methacrylic acid, or 35 g of isooctyl acrylate, 65 g of butyl acrylate, 20 g of vinyl acetate, 60 g of methyl methacrylate, 1.5 g of acrylic acid and 1.5 g of methacrylic acid are added to 50 g of deionized water dissolved with 0.6 g of sodium bicarbonate as a buffer, 2.0 g of sodium dodecyl sulfate (SDS) as an emulsifier and 2.0 g of OP-10, and pre-emulsified by mechanical stirring to obtain a milky white milk-like pre-emulsion; In a four-necked flask equipped with a mechanical stirrer, a condenser, a constant pressure funnel, and a thermometer, add 115 g of deionized water and 0.4 g of initiator ammonium persulfate, heat the flask to 80°C in a water bath, and drip the stirred pre-emulsion using a constant pressure funnel. Add the mixture within 3-4 hours, and continue to heat and react for 2 hours. After cooling to room temperature, discharge the mixture to obtain component A. S2. Preparation of water-based primer: Component A 44-65g, component B 35-56g, stir evenly, add component C 2.7-4g, wetting agent WET250: 2.5-3.5g, defoaming agent TEGO1495: 0.2-1g in component C, continue stirring and add 22g of deionized water, stir evenly to obtain a water-based primer.

2. Application of the aqueous primer of the polymer polyvinyl chloride film according to claim 1 in PVC wiring harness tape.

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