阅读说明：本技术 一种无残胶的pvc保护膜及其制备方法 (PVC protective film without residual glue and preparation method thereof ) 是由 柯跃虎 诸葛锋 宋亦健 曾庆明 于 2021-06-04 设计创作，主要内容包括：本发明涉及保护膜领域,尤其涉及一种无残胶的PVC保护膜及其制备方法,所述保护膜包括PVC基材层和溶剂型橡胶压敏胶层。本发明所述的PVC保护膜耐高温性好,剥离后无残胶,且具有优异的柔软度和弹性,使用时不会出现渗镀、残胶等不良现象,明显提高了产品良率。(The invention relates to the field of protective films, in particular to a PVC protective film without residual glue and a preparation method thereof. The PVC protective film disclosed by the invention has good high-temperature resistance, has no adhesive residue after being stripped, has excellent softness and elasticity, does not have the adverse phenomena of diffusion coating, adhesive residue and the like during use, and obviously improves the yield of products.)

1. The PVC protective film without adhesive residue is characterized by comprising a PVC base material layer and a solvent type rubber pressure-sensitive adhesive layer.

2. The PVC protective film without residual glue of claim 1, wherein the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 20-50 parts of rubber composition, 0.05-0.08 part of auxiliary agent and 10-25 parts of solvent.

3. The PVC protective film without residual glue of claim 2, wherein the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 5-10 parts of tackifying resin.

4. The PVC protective film without residual gum according to claim 2, wherein the rubber composition comprises at least one of natural rubber, nitrile rubber, polyurethane rubber, ethylene propylene rubber, acrylate rubber, chlorosulfonated polyethylene rubber, butyl rubber, butadiene rubber, and isoprene rubber.

5. The PVC protective film without residual rubber according to claim 4, wherein the rubber composition comprises natural rubber and nitrile rubber.

6. The protective film of PVC without cull according to claim 2, wherein the auxiliary agent is selected from antioxidants and/or anti-aging agents.

7. The PVC protective film without adhesive residue as claimed in claim 6, wherein the auxiliary agent is selected from antioxidants.

8. The protective film of PVC without residual glue according to claim 2, wherein the solvent is at least one selected from ethyl acetate, toluene, tetrahydrofuran, acetone, diethyl ether, and dichloromethane.

9. The PVC protective film without adhesive residue of claim 3, wherein the tackifying resin is at least one selected from petroleum resin, hydrogenated petroleum resin, alkyl phenolic resin, rosin and polyisocyanate adhesive.

10. The preparation method of the PVC protective film without residual glue according to any one of claims 1 to 9, characterized by comprising (1) stirring and blending raw materials for preparing the solvent type rubber pressure-sensitive adhesive layer; (2) coating the preparation raw material of the solvent type rubber pressure-sensitive adhesive layer on the surface of a PVC base material layer, drying and rolling to obtain the adhesive.

Technical Field

The invention relates to the field of protective films, in particular to a PVC protective film without residual glue and a preparation method thereof.

Background

In the manufacturing process of the PCB, the electroplating process of the PCB is an indispensable and very critical step, in the electroplating process, a protective film needs to be covered on the PCB, the protective film is hollowed out in the electroplated area, and other areas are protected. The PVC protective film is a common protective film in the field of PCB manufacturing, and in the whole operation link, the protective film needs to be peeled off and pasted repeatedly, but the PVC protective film in the prior art has the defects of residual glue after peeling, no high temperature resistance during electroplating, and also has the adverse phenomena of diffusion plating and the like, and the quality of the PCB is seriously influenced, so that the development of the PVC protective film which is high temperature resistant, has no residual glue after peeling and has no diffusion plating is very significant.

Disclosure of Invention

The invention provides a PVC protective film without adhesive residue, which comprises a PVC base material layer and a solvent type rubber pressure-sensitive adhesive layer.

As a preferred embodiment, the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 20-50 parts of rubber composition, 0.05-0.08 part of auxiliary agent and 10-25 parts of solvent.

As a preferred embodiment, the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 5-10 parts of tackifying resin.

As a preferred embodiment, the rubber composition includes at least one of natural rubber, nitrile rubber, urethane rubber, ethylene propylene rubber, acrylate rubber, chlorosulfonated polyethylene rubber, butyl rubber, butadiene rubber, and isoprene rubber.

As a preferred embodiment, the rubber composition comprises natural rubber and nitrile rubber.

As a preferred embodiment, the auxiliary agent is selected from antioxidants and/or anti-ageing agents.

As a preferred embodiment, the auxiliary agent is selected from antioxidants.

As a preferred embodiment, the solvent is at least one selected from the group consisting of ethyl acetate, toluene, tetrahydrofuran, acetone, diethyl ether, and dichloromethane.

In a preferred embodiment, the tackifying resin is at least one selected from the group consisting of petroleum resins, hydrogenated petroleum resins, alkyl phenol resins, rosins, and polyisocyanate gums.

The second aspect of the invention provides a preparation method of a PVC protective film without residual glue, (1) stirring and blending preparation raw materials of a solvent type rubber pressure-sensitive adhesive layer; (2) coating the preparation raw material of the solvent type rubber pressure-sensitive adhesive layer on the surface of a PVC base material layer, drying and rolling to obtain the adhesive.

Compared with the prior art, the invention has the following beneficial effects: the PVC protective film disclosed by the invention has good high-temperature resistance, has no adhesive residue after being stripped, has excellent softness and elasticity, does not have the adverse phenomena of diffusion coating, adhesive residue and the like during use, and obviously improves the yield of products.

Detailed Description

In order to solve the above technical problems, a first aspect of the present invention provides a PVC protective film without adhesive residue, the protective film including a PVC substrate layer and a solvent-based rubber pressure-sensitive adhesive layer.

As a preferred embodiment, the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 20-50 parts of rubber composition, 0.05-0.08 part of auxiliary agent and 10-25 parts of solvent.

Preferably, the rubber composition comprises at least one of natural rubber, nitrile rubber, urethane rubber, ethylene propylene rubber, acrylate rubber, chlorosulfonated polyethylene rubber, butyl rubber, butadiene rubber and isoprene rubber.

Preferably, the rubber composition comprises natural rubber and nitrile rubber.

Preferably, the mass ratio of the natural rubber to the nitrile rubber is (2-7): 1.

preferably, the mass ratio of the natural rubber to the nitrile rubber is (2-5): 1.

preferably, the natural rubber has an elastic modulus of 2 to 4 MPa.

Preferably, the Mooney viscosity of the nitrile rubber is from 55 to 75M.

Preferably, the rubber composition further includes a urethane rubber.

Preferably, the tensile strength of the polyurethane rubber is 35 to 40 MPa.

Preferably, the mass ratio of the polyurethane rubber to the natural rubber to the nitrile rubber is (0.5-2): (2-5): 1.

as a preferred embodiment, the auxiliary agent is selected from antioxidants and/or anti-ageing agents.

Preferably, the adjuvant is selected from antioxidants.

Preferably, the antioxidant is selected from the group consisting of antioxidant 1010, antioxidant 168, antioxidant DLTP, antioxidant 1790, antioxidant 264, antioxidant bht, antioxidant L57, antioxidant 264, antioxidant 7501, antioxidant B215, antioxidant 2264

Preferably, the antioxidant is selected from antioxidant 1010.

As a preferred embodiment, the solvent is at least one selected from the group consisting of ethyl acetate, toluene, tetrahydrofuran, acetone, diethyl ether, and dichloromethane.

Preferably, the solvent is selected from toluene.

As a preferred embodiment, the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 5-10 parts of tackifying resin.

Preferably, the tackifying resin is at least one selected from the group consisting of petroleum resin, hydrogenated petroleum resin, alkyl phenol resin, rosin, and polyisocyanate gum.

Preferably, the tackifying resin is selected from petroleum resins, hydrogenated petroleum resins.

Preferably, the petroleum resin is C5 petroleum resin.

Preferably, the C5 petroleum resin has a melt viscosity of 220-250 mP.s.

Preferably, the mass ratio of the petroleum resin to the hydrogenated petroleum resin is (3-8): (1-2).

In a preferred embodiment, the mass ratio of the rubber composition to the tackifying resin is (2-10): 1.

in a preferred embodiment, the PVC substrate in the PVC substrate layer is a PVC blue film.

Preferably, the thickness of the PVC blue film is 0.05-0.1 mm.

The second aspect of the invention provides a preparation method of a PVC protective film without residual glue, (1) stirring and blending preparation raw materials of a solvent type rubber pressure-sensitive adhesive layer; (2) coating the preparation raw material of the solvent type rubber pressure-sensitive adhesive layer on the surface of a PVC base material layer, drying and rolling to obtain the adhesive.

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

Natural rubber purchased from Jinan Lu rubber chemical Co Ltd

Nitrile rubber was purchased from Camphor wood constant Tai Plastic raw materials Ministry of academic Union

Polyurethane rubber was purchased from Guanguan high Stand chemical Co Ltd

C5 Petroleum resin was purchased from Puyang Kongyu Petroleum resins Co Ltd

PVC blue film from Shenzhen Ruilabao film materials Limited

Antioxidant 1010 was purchased from Risheng plastics Co., Ltd, Foshan City

Hydrogenated Petroleum resins from Hengtai petrochemical Co Ltd

In addition, the starting materials used are all commercially available, unless otherwise specified.

Examples

The first aspect of the embodiment provides a no-adhesive-residue PVC protective film, which comprises a PVC substrate layer and a solvent-type rubber pressure-sensitive adhesive layer.

The PVC substrate layer is a PVC blue film, and the thickness is 0.08 mm.

The solvent type rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 30 parts of rubber composition, 10100.06 parts of antioxidant, 20 parts of toluene and 8 parts of tackifying resin.

The rubber composition is prepared from polyurethane rubber (with the tensile strength of 37MPa), natural rubber (with the elastic modulus of 3MPa) and nitrile rubber (with the Mooney viscosity of 65M) in a mass ratio of 1.5: 4: 1 stirring and blending.

The tackifying resin is C5 petroleum resin (the melt viscosity is 240mP.s), and the hydrogenated petroleum resin is prepared from the following components in a mass ratio of 5: 2 stirring and blending.

The second aspect of this embodiment provides a preparation method of a PVC protective film without residual glue, (1) the raw materials for preparing the solvent-based rubber pressure-sensitive adhesive layer are stirred and blended; (2) coating the preparation raw material of the solvent type rubber pressure-sensitive adhesive layer on the surface of a PVC base material layer, wherein the coating thickness is 30 mu m, drying and rolling to obtain the adhesive.

Comparative example 1

The first aspect of the present comparative example provides a PVC protective film without residual gum, which is the same as example 1, except that the rubber composition is urethane rubber (tensile strength of 37MPa), natural rubber (elastic modulus of 3MPa), nitrile rubber (mooney viscosity of 65M) in a mass ratio of 1.5: 1: 5 stirring and blending.

In a second aspect, the present comparative example provides a method for preparing a PVC protective film without residual glue, the specific embodiment of which is the same as example 1.

Comparative example 2

The first aspect of the present comparative example provides a PVC protective film without residual gum, and the specific embodiment is the same as example 1, except that the rubber composition is natural rubber (elastic modulus is 3MPa), nitrile rubber (mooney viscosity is 65M) and the mass ratio is 4: 1 stirring and blending.

In a second aspect, the present comparative example provides a method for preparing a PVC protective film without residual glue, the specific embodiment of which is the same as example 1.

Comparative example 3

This comparative example provides, in a first aspect, a PVC protective film without adhesive residue, as embodied in example 1, except that the tackifying resin is C5 petroleum resin (melt viscosity 240mp. s.).

In a second aspect, the present comparative example provides a method for preparing a PVC protective film without residual glue, the specific embodiment of which is the same as example 1.

Comparative example 4

The first aspect of the present comparative example provides a PVC protective film without residual glue, and the specific embodiment is the same as example 1, except that the solvent-based rubber pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 30 parts of rubber composition, 10100.06 parts of antioxidant, 20 parts of toluene and 20 parts of tackifying resin.

In a second aspect, the present comparative example provides a method for preparing a PVC protective film without residual glue, the specific embodiment of which is the same as example 1.

Performance testing

The PVC protective films of examples and comparative examples were applied to the electroplating process of PCBs, and the following tests were performed:

the test method of the stripping residual glue comprises the following steps: stripping 100 parts of PVC protective film at 60 ℃ and observing whether the PCB has residual glue or not, wherein the PCB has excellent residual glue, and the number of the residual glue is between 1 and 10, namely good, and is more than 10.

The diffusion plating test method comprises the following steps: and (4) carrying out a PCB gold plating process on the PVC protective film, and observing the diffusion plating condition of the PVC protective film.

	Stripping residual glue	Diffusion coating test
			Examples	Superior food	Non-diffusion plating
Comparative example 1	Good wine	With diffusion coating
			Comparative example 2	Difference (D)	With diffusion coating
Comparative example 3	Difference (D)	With diffusion coating
			Comparative example 4	Difference (D)	With diffusion coating

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content of the above disclosure into equivalent embodiments with equivalent changes, but all those simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.