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A method for improving edge strength of polyamic acid film

A technology of polyamic acid and polyamic acid resin, which can be used in other household appliances, coatings, flat products, etc., can solve the problem that the yield of polyamic acid resin is not improved, and can accelerate the imidization closed loop. Reactive, non-degradable, mechanically enhanced effect

Active Publication Date: 2020-12-04
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since 150-200°C is the temperature range for severe thermal degradation of polyamic acid, the film yield rate of polyamic acid resin with high molecular structure rigidity does not improve much.

Method used

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  • A method for improving edge strength of polyamic acid film
  • A method for improving edge strength of polyamic acid film
  • A method for improving edge strength of polyamic acid film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Weigh each component according to the following weight ratio, mix and stir evenly, and obtain the coating liquid;

[0028] 80 parts of DMAC, 20 parts of DMP-30, 0.5 parts of 1,3,5-tris(4-aminophenoxy)benzene, and 1 part of triphenyl phosphite;

[0029] 2) Add 22kg of ODA, 11.3kg of PDA and 320kg of DMAC in the reactor, add 46.5kg of PMDA after dissolving (adding in 3 times), react at room temperature for 5h, and obtain a polyamic acid resin with a viscosity of 200,000 centipoise solution, which is transported to a defoaming kettle for defoaming, to obtain a defoamed polyamic acid resin solution;

[0030] 3) Set the temperature of the drooling upper drying tunnel to 180°C, and the temperature of the lower drying tunnel to 190°C, first coat the coating solution on the steel strip, and then pour the defoamed polyamic acid resin solution onto the steel strip (i.e. During the whole drooling process, before the resin solution falls onto the steel strip each time, the corr...

Embodiment 2

[0041] 1) Weigh each component according to the following weight ratio, mix and stir evenly, and obtain the coating liquid;

[0042] 70 parts of DMF, 15 parts of DMP-30, 1 part of triprimary amine crosslinking agent represented by formula (1), 0.5 part of triphenyl phosphite;

[0043] 2) Add 21.5kg of p-phenylenediamine and 320kg of DMF in the reaction kettle, add 58.7kg of BPDA after dissolving (adding in 3 times), react at room temperature for 8 hours, and obtain a polyamic acid resin with a viscosity of 200,000 centipoise solution, which is transported to a defoaming kettle for defoaming, to obtain a defoamed polyamic acid resin solution;

[0044] 3) Set the temperature of the drooling upper drying tunnel to 160°C and the temperature of the lower drying tunnel to 170°C, first coat the coating liquid on the steel strip, and then pour the defoamed polyamic acid resin solution onto the steel strip, Remove 69% solvent in the salivation furnace, obtain polyamic acid gel film; W...

Embodiment 3

[0050] Repeat Example 1, the difference is: in step 1), the amount of DMP-30 is changed to 10 parts.

[0051] The imidization rate and mechanical properties such as tensile strength and elongation at break of the polyamic acid gel film edge (that is, the part coated with the coating liquid) prepared in step 3) of the present embodiment are detected, and the result As shown in Table 1 below.

[0052] When the method described in this example is continuously produced for 10 days, the number of broken edges and the total number of broken films, yield and yield during longitudinal stretching, transverse stretching and imidization are counted respectively, and the results are shown in Table 1 below .

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Abstract

The invention discloses a method for improving the strength of a polyamic acid film edge part. The method comprises the following steps that slobbering film preparation is carried out on a defoaming polyamide acid resin solution, wherein the step is characterized in that a coating liquid coats a specific area of a support body, and the defoaming polyamide acid resin solution slobbers to the support body to form a film; and the coating liquid comprises, by weight, 70-90 parts of aprotic polar solvent, 10-30 parts of DMP-30, 0.1-1 part of triprimary amine crosslinking agent and 0.5-2 parts of triphenyl phosphite. According to the method, the coating liquid coats the specific area through the coating liquid with a specific proportion, so that the imidization degree of the edge part of the obtained polyamide acid gel film is effectively improved, the mechanical property of the edge part is enhanced, and thus the number of times of edge breaking and film breaking caused by abnormal edge parts in the process of longitudinal stretching, transverse stretching, imidization and the like is effectively reduced, and the yield is improved.

Description

technical field [0001] The invention relates to a polyimide film, in particular to a method for improving the edge strength of a polyamic acid film. Background technique [0002] When preparing biaxially stretched polyimide film for flexible copper clad laminate (FCCL), usually a polyamic acid resin solution with a certain viscosity is extruded through a die on a continuously running support (ring) to form a smooth The liquid film is heated, reacted and dried in the furnace following the support body, and then peeled off from the support body to obtain a gel film (that is, a polyamic acid film, also known as a self-supporting film), and the resulting gel film is transported to a metal roller After that, fix the lateral sides of the gel film (the two sides in the width direction of the gel film) with pins or metal clips, etc., and then continuously transport them into the heating furnace for transverse stretching and high-temperature sublimation. After amination, the imidize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C41/24B29C41/34C08J5/18C08L79/08C08G73/10B29L7/00
CPCB29C41/003B29C41/24B29C41/34B29L2007/002C08G73/1007C08G73/1067C08G73/1071C08J5/18C08J2379/08
Inventor 青双桂刘姣潘钦鹏白小庆邹本久
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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