Composition and method for preparing ultrathin gas-permeable film

A technology of composition and breathable film, which is applied in the field of modified plastic processing, can solve the problems of complex procedures and high processing costs, and achieve the effects of improving casting and stretching speed, optimizing processability, and ensuring uniformity

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process is more complicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The broad distribution MDPE (density 0.937g / cm 3, MFR is 4.5g / 10min, molecular weight distribution is 15) and LLDPE (MFR is 2.0g / 10min), calcium carbonate (particle size 0.1μm ~ 3μm, the surface is treated with coupling agent), antioxidant and processing aids Blending, wherein the antioxidant is selected from the composition of antioxidant 1010 and antioxidant 168 (mass ratio 1:1), and the processing aid is selected from white oil. The parts by weight of each component are shown in Table 1.

[0031] Mix the components uniformly in a high-speed mixer and then add them to a twin-screw extruder at an extrusion temperature of 230°C. After extrusion, pelletizing, and drying, a composition with high processability and an ultra-thin breathable film is obtained, and passed through a casting machine After casting and stretching in the longitudinal direction, it was 1.5 times the original length to obtain a breathable film product. The properties of the obtained film are shown i...

Embodiment 2

[0033] Select metallocene LLDPE (MFR is 3.0g / 10min) to replace the LLDPE in Example 1, other blending components are the same as in Example 1, and the parts by weight of each component are shown in Table 1; 1, the properties of the obtained films are shown in Table 2.

[0034] The results show that using metallocene LLDPE instead of Zieglor-Natta catalyzed LLDPE can further improve the mechanical properties of the breathable membrane, thereby further reducing the weight.

Embodiment 3

[0036] The blending components are the same as in Example 1, and the parts by weight of each component are shown in Table 1; each component is mixed uniformly in a high-speed mixer and then added to a twin-screw extruder, the extrusion temperature is 230 ° C, and the extrusion , granulation, and drying to obtain a composition with high processability and ultra-thin gas-permeable film, which is cast by a casting machine and stretched longitudinally to 2.0 times the original length to obtain a gas-permeable film product. The properties of the obtained film are shown in Table 2 shown.

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PUM

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Abstract

The invention provides a composition and a method for preparing an ultrathin gas-permeable film. The gas-permeable film composition comprises a polyethylene blend, inorganic filler, a dispersant, an antioxidant and processing additives, wherein the polyethylene blend comprises medium-density polyethylene and linear low-density polyethylene, and can also comprise low-density polyethylene; the inorganic filler is micron or nano-scale calcium carbonate; and the dispersant is superfine fully-vulcanized powder rubber. The composition has better processing performance and mechanical properties, the casting and elongation rate are increased and meanwhile the gram weight can be further decreased to reduce the costs; the superfine fully-vulcanized powder rubber can assist the uniform dispersion of the inorganic filler in the resin so that the uniformity of the gas-permeable film is ensured.

Description

technical field [0001] The invention relates to the field of modified plastic processing, in particular to a polyethylene composition with high processability for an ultra-thin gas-permeable film and a preparation method for the ultra-thin gas-permeable film. Background technique [0002] The breathable membrane is also called "waterproof and breathable microporous membrane". It has the characteristics of breathability and impermeability. It is widely used in hygienic products such as baby diapers and women's hygiene products, as well as medical, food packaging, agriculture, textiles, construction and other fields, and is rapidly developing internationally. new material. [0003] The breathable membrane was first successfully developed in Japan, and has been vigorously developed in South Korea. The products are exported to all over the world in large quantities, among which China is the largest demand place for products. At present, the key technology of breathable film pr...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K9/06C08K9/04C08K3/26C08K5/134C08K5/526
CPCC08K2201/003C08L23/06C08L23/0815C08L2203/16C08L2205/025C08L2205/03C08L2205/035C08L2207/066C08L91/06C08K9/06C08K9/04C08K2003/265C08K5/1345C08K5/526C08L9/06
Inventor 权慧张师军李杰初立秋高达利吕芸刘建叶徐萌
Owner CHINA PETROLEUM & CHEM CORP
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