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A PVDF stretch film containing core-shell rubber particles

A technology of core-shell rubber and stretch film, which is applied in the field of PVDF stretch film, can solve the problem of uneven thickness of PVDF film, and achieve the effects of small local strain, improved elongation at break, and uniform thickness

Active Publication Date: 2021-03-16
SUZHOU GOLDEN TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a PVDF stretched film containing core-shell rubber particles to solve the problem of uneven thickness in the current PVDF film stretching process

Method used

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  • A PVDF stretch film containing core-shell rubber particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of core-shell polymers

[0032] Add 200 parts of water, 0.03 parts of tripotassium phosphate, 0.25 parts of potassium dihydrogen phosphate, 0.002 parts of ethylenediaminetetraacetic acid, 0.001 parts of ferrous sulfate and 1.5 parts of sodium dodecylbenzenesulfonate into the polymerization kettle, and stir fully while stirring. Nitrogen substitution was performed, 100 parts of butadiene was charged into the reaction system, and the temperature was raised to 45°C. Throw in 0.015 part of hydrogen peroxide p-menthane, then drop into 0.04 part of sodium formaldehyde sulfoxylate, and start the polymerization reaction. Iron 0.001 part. The reaction was continued for 6 hours, the remaining monomers were removed under reduced pressure, and the polymerization was terminated to obtain a polybutadiene rubber elastomer emulsion, wherein the average particle size of the polybutadiene particles was 0.1 μm.

[0033] Add 1300 g of the obtained polybutadiene rubber elastom...

Embodiment 2

[0045] Embodiment 2 comparative experiment

[0046] Table 1 shows the performance comparison of cast sheets and stretched films prepared in Example 1 and Comparative Example.

[0047] Table 1

[0048]

[0049] From the experimental data, it can be found that the membrane rupture rate of the PVDF film added with the core-shell polymer is greatly reduced, and the elongation at break is significantly increased. Uniformity of thickness.

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Abstract

The invention belongs to the field of PVDF films, and in particular relates to a PVDF stretch film containing core-shell rubber particles. The composition of the raw materials comprises the followingcomponents calculated in parts by weight: 100 parts of PVDF, 1 to 10 parts of core-shell polymers and 5 to 30 parts of fillers; the cores of the core-shell polymers are one or a mixture of both rubberelastomers and polysiloxane rubber elastomers, and the shells of the core-shell polymers are (PMMA) resin. According to the technical scheme provided by the invention, a small amount of the core-shell polymers are added, the raw materials are less affected by temperature and the viscosity is not changed much when casting chips are subjected to melt extrusion, so that fluid can be ensured to outflow uniformly to ensure the uniform thickness of each casting chip; furthermore, when drawn, the films do not obviously jitter to ensure the uniform thickness of the films so as to effectively avoid the problem of film rupture.

Description

technical field [0001] The invention belongs to the field of PVDF films, in particular to a PVDF stretched film containing core-shell rubber particles. Background technique [0002] There are many film ruptures in stretched films, especially for stretched films with relatively low thickness. Among them, horizontal stretched film ruptures are the most common in the production process. Films are most likely to rupture when they are stretched at high speed. Generally, horizontal tensile membrane rupture is divided into three types: horizontal membrane rupture, longitudinal membrane rupture, and clamp rupture. The reasons for the three types of horizontal tensile membrane rupture are as follows: [0003] The specific reasons for transverse membrane rupture are as follows: 1. The raw materials contain impurities with large performance differences; 2. There are obvious transverse stripes and bubbles on the cast sheet; 3. The longitudinal thickness of the film fluctuates, which cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L51/00C08F236/06C08F220/14C08F212/08C08F220/44
Inventor 唐超李华
Owner SUZHOU GOLDEN TECH MATERIAL