Low-precipitation PVC protective film and preparation method thereof

A technology of protective film and adhesive layer, applied in the direction of film/sheet adhesive, adhesive type, adhesive additive, etc., can solve the environmental hazards of production line workers, the deterioration of PVC film performance, and affect the use of circuit boards Life expectancy and other issues, to achieve the effect of simple and time-saving preparation method, low plasticizer precipitation rate, excellent anti-aging performance

Active Publication Date: 2021-07-23
广东硕成科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, the plasticizer in PVC is easy to precipitate with the prolongation of use time and the change of the environment, and adheres to the surface of the circuit board, making the performance of the PVC film deteriorate, which not only seriously affects the use function of the circuit board, but also affects the production line. workers, serious hazards to the environment
In addition, circuit boards are mostly used in environments with strong light and high temperature, and the existing PVC materials are prone to aging and deterioration under such conditions, which affects the service life of circuit boards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] The second aspect of the present invention provides a kind of preparation method of low precipitation PVC protective film, comprises the steps:

[0050] 1. Put the raw materials for the preparation of the adhesive layer in a reaction kettle at 200-260°C for 7-9 hours in a closed reaction.

[0051] 2. After the reaction, the raw materials for the preparation of the adhesive layer are passed through a 100-150 mesh sieve, and the raw materials for the preparation of the adhesive layer after sieving are evenly spread on the surface of the PVC substrate by the coating method, and dried at 50-100 ° C.

[0052] 3. Paste the release paper layer on the surface of the raw material for the preparation of the adhesive layer, and cut it into the desired shape with a slitting machine to obtain a low-separation PVC protective film.

Embodiment 1

[0070] The first aspect of embodiment 1 provides a kind of low-separation PVC protective film, and the protective film is followed by a release paper layer, an adhesive layer and a PVC base material from top to bottom, and the thickness of the release paper layer is 0.1mm. The thickness of the layer is 10 ± 1 μm and the thickness of the PVC substrate is 80 μm. The release paper layer is double-silicon release paper; the raw materials for the preparation of the adhesive layer include 50 parts of rubber base material, 12 parts of melting agent, 5 parts of filler and 0.5 part of anti-aging agent in parts by weight.

[0071] The rubber base material is a mixture of natural rubber and styrene-butadiene rubber at a weight ratio of 1:2, wherein the melt mass flow rate of the styrene-butadiene rubber is 0.05 g / 10 min.

[0072] The melting aid is a mixture of rosin and polyisocyanate glue at a weight ratio of 0.6:1, wherein the rosin is a primary rosin with an acid value of 166 mg / g. ...

Embodiment 2

[0080] The first aspect of embodiment 2 provides a kind of low precipitation PVC protective film, and protective film is followed by release paper layer, adhesive layer and PVC base material from top to bottom, and the thickness of release paper layer is 0.1mm, and bonding The thickness of the layer is 10 ± 1 μm and the thickness of the PVC substrate is 80 μm. The release paper layer is double-silicon release paper; the raw materials for the preparation of the adhesive layer include 86 parts of rubber base material, 20 parts of melting agent, 9 parts of filler and 3 parts of anti-aging agent in parts by weight.

[0081] The rubber base material is a mixture of natural rubber and styrene-butadiene rubber at a weight ratio of 1:4, wherein the melt mass flow rate of the styrene-butadiene rubber is 5 g / 10 min.

[0082] The melting aid is a mixture of rosin and polyisocyanate glue at a weight ratio of 1.5:1, wherein the rosin is a first-grade rosin, and the acid value is 166 mg / g. ...

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Abstract

The invention relates to the field of films, in particular to a low-precipitation PVC protective film and a preparation method thereof. The protective film sequentially comprises the release paper layer, the bonding layer and the PVC base material from top to bottom, has the advantages of being good in heat resistance and high in stability, the plasticizer precipitation rate is extremely low at high temperature, pollution and damage to a circuit board are avoided, natural rubber and butadiene styrene rubber are compounded according to a specific proportion, the toughness of the bonding layer is remarkably improved, the bonding force between the bonding layer and the PVC base material, the bonding layer and the release paper layer is improved, the PVC protective film can be used for a long time, the preparation method optimizes the redundant technological process in the prior art, large-scale production of enterprises can be achieved, and economic benefits are improved.

Description

technical field [0001] The invention relates to the field of films, in particular to a low-separation PVC protective film and a preparation method thereof. Background technique [0002] PVC generally refers to polyvinyl chloride, which is a polymer polymerized from polyethylene monomers. PVC film is widely used in the surface treatment of PCB and FPC circuit boards. In actual production, the plasticizer in PVC is easy to precipitate with the prolongation of use time and the change of the environment, and adheres to the surface of the circuit board, making the performance of the PVC film deteriorate, which not only seriously affects the use function of the circuit board, but also affects the production line. Workers, serious harm to the environment. In addition, circuit boards are mostly used in environments with strong light and high temperature, and existing PVC materials are prone to aging and deterioration under such conditions, which affects the service life of circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/24C09J7/30C09J109/06C09J107/00C09J11/04C09J11/06C09J11/08
CPCC08K2003/2296C08K2003/265C08K2201/003C08L2201/08C09J11/04C09J11/06C09J11/08C09J109/06C09J2427/006C09J7/245C09J7/30C08L7/00C08L93/04C08K3/22C08K3/04C08K3/26C08K5/3437
Inventor 柯跃虎诸葛锋宋亦健曾庆明
Owner 广东硕成科技股份有限公司
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