METHOD FOR MANUFACTURING HIGH TEMPERATURE-RESISTANT POLYVINYL CHLORIDE ADHESIVE TAPE

Abstract

The present invention relates to a method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape, and more particularly to a method and a production process for manufacturing a high temperature-resistant adhesive tape by applying a UV-crosslinkable hot-melt pressure-sensitive adhesive to a high temperature-resistant polyvinyl chloride film. The high temperature-resistant polyvinyl chloride film is a high temperature-resistant material containing a liquid polymeric plasticizer, a solid polymeric plasticizer, and a heat stabilizer. The hot-melt pressure-sensitive adhesive can be directly coated onto the high temperature-resistant polyvinyl chloride film at 130-150° C.; and then crosslinked and cured by UV irradiation, to make a high temperature-resistant polyvinyl chloride adhesive tape. Compared with conventional polyvinyl chloride adhesive tapes, the high temperature-resistant polyvinyl chloride adhesive tape manufactured using the method for manufacturing a novel high temperature-resistant polyvinyl chloride adhesive tape provided in the present invention has the advantages of non-volatility and resistance to high temperature and is highly environmentally friendly.

Claims

1. A method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape, comprising: coating, as a hot melt, a UV-crosslinkable hot-melt pressure-sensitive adhesive onto a high temperature-resistant polyvinyl chloride film at a temperature of 130-150° C., and then crosslinking by UV irradiation with a set of UV lamps, wherein the high temperature-resistant polyvinyl chloride film comprises a liquid polymeric plasticizer, a solid polymeric plasticizer, and a heat stabilizer; wherein the high temperature-resistant polyvinyl chloride film is protected by cooling during the coating process.

2. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the UV-crosslinkable hot-melt pressure-sensitive adhesive comprises a copolymer of one or more polymerizable photoinitiators and an acrylate monomer, or a mixture of an oligomer containing one or more polymerizable photoinitiators and an acrylate polymer.

3. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 2, wherein the UV-crosslinkable hot-melt pressure-sensitive adhesive further comprises a heat stabilizer, a photostabilizer, a tackifying resin, and a plasticizer.

4. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the liquid polymeric plasticizer is at least one selected from the group consisting of liquid polyethylene glycol adipate and liquid polypropylene glycol adipate.

5. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the solid polymeric plasticizer is at least one selected from the group consisting of an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-butyl acrylate copolymer, a nitrile butadiene rubber powder, and chlorinated polyethylene.

6. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the heat stabilizer is at least one selected from the group consisting of a non-lead liquid or a solid barium/zinc stabilizer, a cadmium/barium/zinc stabilizer, a calcium/zinc stabilizer, and an organotin stabilizer.

7. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 2, wherein the polymerizable photoinitiator is an acetophenone or benzophenone derivative containing a methacryloyloxy group or an acryloyloxy group.

8. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the amount coated of the UV-crosslinkable hot-melt pressure-sensitive adhesive in hot melt coating is 10-35 g/cm.sup.2.

9. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the UV lamp is a high-pressure mercury lamp, a medium-to-low pressure mercury lamp or an LED lamp, having a UV irradiation energy of at least 10 mJ/cm.sup.2.

10. The method for manufacturing a high temperature-resistant polyvinyl chloride adhesive tape according to claim 1, wherein the coating is carried out by means of slot-die coating, bar coating or extrusion laminating.

Description

DETAILED DESCRIPTION

[0026] The illustrative and comparative examples of the present invention are described in detail below. The illustrative examples are provided for making the present invention clearer to those skilled in the art and making the present invention implementable based on the description herein. The specific examples are not intended to limit the present invention, and the scope of the present invention is defined by the appended claims.

[0027] In the examples and comparative examples provided in the present invention, the following polyvinyl chloride films are used respectively:

[0028] 1. High temperature-resistant polyvinyl chloride film having a composition comprising, in percent by weight:

TABLE-US-00001 SG-3 polyvinyl chloride resin 57.5%.sup.  Ethylene glycol adipate plasticizer 25% Ethylene-methacrylate-carbonyl polymer  4% Nitrile butadiene rubber powder 1.5%  Liquid barium/zinc stabilizer  2% Calcium carbonate 10%

[0029] The raw materials are mixed, and then mixed by a high-speed mixer, milled in an open mill at a high temperature, extruded by an extruder, and rolled at high temperature by a three-roll or a four-roll calender to prepare a polyvinyl chloride film.

[0030] 2. Polyvinyl chloride films containing a DOP plasticizer are generally available from the market.

Example 1

[0031] An acrylate copolymer of n-butyl acrylate, isooctyl acrylate, methyl acrylate, and acrylic acid with a copolymerizable photoinitiator was applied to the above-mentioned high temperature-resistant polyvinyl chloride film through a process as described above to prepare a polyvinyl chloride adhesive tape. The coating temperature was 140° C.

Example 2

[0032] An acrylate copolymer of n-butyl acrylate and acrylic acid with a copolymerizable photoinitiator was applied to the above-mentioned high temperature-resistant polyvinyl chloride film through a process as described above, to prepare a polyvinyl chloride adhesive tape. The coating temperature was 140° C.

Example 3

[0033] A mixture comprising 20% of an oligomer of n-butyl acrylate and acrylic acid with a copolymerizable photoinitiator and 80% of an acrylate polymer was applied to the above-mentioned high temperature-resistant polyvinyl chloride film through a process as described above, to prepare a polyvinyl chloride adhesive tape. The coating temperature was 130° C.

Comparative Example 1

[0034] If an acrylate copolymer of n-butyl acrylate, isooctyl acrylate, methyl acrylate, and acrylic acid with a copolymerizable photoinitiator was directly applied to a polyvinyl chloride film containing a DOP plasticizer, the film wound be destroyed. Therefore, in this comparative example, transfer coating was employed, that is, the acrylate copolymer was coated onto a release paper first, and then transferred to a polyvinyl chloride film containing a DOP plasticizer. The coating temperature was 140° C.

Comparative Example 2

[0035] The polyvinyl chloride adhesive tape for use in wiring harness for automobile currently used in the industry is Huaxia adhesive tape FC110 (high temperature-resistant PVC adhesive tape for use in wiring harness for automobile, manufactured by Hebei Huaxia Enterprise Co., Ltd.). The adhesive used is a solvent-type rubber-based system, and the polyvinyl chloride film used is a high temperature-resistant polyvinyl chloride film.

Comparative Example 3

[0036] The polyvinyl chloride adhesive tape for use in wiring harness for automobile currently used in the industry is Huaxia adhesive tape UD110 (PVC adhesive tape for use in wiring harness for automobile, manufactured by Hebei Huaxia Enterprise Co., Ltd.). The adhesive used is a solvent-type rubber-based system, and the polyvinyl chloride film used is a polyvinyl chloride film a containing a DOP plasticizer.

TABLE-US-00002 TABLE 1 Performance data of adhesive tapes manufactured Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 1 Example 2 Example 3 Peel strength at 180° 1.3 1.7 1.5 Serious “adhesive 1.5 1.2 from steel plate, N/cm loss” occurs upon Initial adhesion 17 19 18 unrolling of the 16 16 power, number of ball adhesive tape, and Maintenance of 240 300 270 various 200 180 adhesion power, min performances are failed to be tested Temperature 125 125 125 — 105 80 resistance level, ° C. Aging test at 60° C. for No No No — No adhesive No adhesive 8 hrs adhesive adhesive adhesive loss occurs loss occurs loss loss loss upon upon occurs occurs occurs unrolling unrolling upon upon upon unrolling unrolling unrolling

[0037] From the performance data of Examples 1-3 in Table 1, it can be seen that the UV-crosslinkable hot-melt pressure-sensitive adhesive can significantly improve the high-temperature resistance of the polyvinyl chloride adhesive tape, reaching a temperature resistance level of 125° C. The adhesive tape prepared with a solvent-type rubber has a high-temperature resistance level of 105° C. (Comparative Example 2). As can be known from the test results of Comparative Examples 1 and 3, UV-crosslinkable hot-melt pressure-sensitive adhesive has a resistance to low-molecular weight plasticizers that is not as good as that of the solvent-type rubber. In general, the UV-crosslinkable hot-melt pressure-sensitive adhesive is suitable for application to a high temperature-resistant polyvinyl chloride film containing a polymeric plasticizer, and the manufactured adhesive tape meets the industrial application specifications. In addition, the adhesive tape has excellent high-temperature resistance, is suitable for the wrapping and bundling of cable bundles, and especially suitable for the wrapping and bundling of cable bundles in automobile bodies.