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A kind of high moisture permeability polyolefin microporous breathable film

A polyolefin, breathable film technology, applied in other household appliances, flat products, household appliances, etc., can solve the problems of weakened humidity regulation, film leakage, and inability to effectively improve the experience of sanitary products.

Active Publication Date: 2019-04-02
SHANGHAI ZIHUA FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of this basis weight, the moisture-regulating effect of the polyolefin microporous breathable membrane is bound to be weakened. The mainstream water vapor transmission rate evaluation method, namely GB / T 1037 test, the value is only 2000-4000g / m 2 24 hours, the water vapor transmission rate in the first hour is only 150-500g / m 2 h, because the water vapor permeated per unit time is low, it cannot effectively improve the user experience of sanitary products, and under the above performance indicators, the film still has the risk of leakage

Method used

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  • A kind of high moisture permeability polyolefin microporous breathable film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The polyolefin microporous air-permeable membrane of this example is prepared using special formula raw materials, specifically including the following steps:

[0032] A. Polyolefin substrate and inorganic filler are blended, extruded and granulated at a mass ratio of 1:1 to obtain a composite material and granulated. The polyolefin substrate is a mixture of metallocene polyethylene and linear low-density polyethylene with a mass ratio of 3:2. Among them, metallocene polyethylene uses a melt index of 3.5g / 10min and a density of 0.927. Linear low density polyethylene uses a melt index of 2.3g / 10min and a density of 0.917. The inorganic filler is: inorganic particles with a particle diameter of 3-5 μm and a particle size distribution of more than 80%. The inorganic filler is a mixture of calcium carbonate and titanium dioxide with a mass ratio of 50:1.

[0033] B. The composite material particles are extruded and melted by a casting extruder, and the melt temperature i...

Embodiment 2

[0038] The raw materials and preparation method used in the polyolefin microporous air-permeable membrane involved in this example are the same as those in Example 1, except that:

[0039] The basis weight of the obtained product is 25gsm;

[0040] Relevant performance tests were carried out on the prepared microporous air-permeable membrane with a basis weight of 25 gsm, and the results are shown in Table 1.

Embodiment 3

[0042] The preparation method of the polyolefin microporous air-permeable membrane involved in this embodiment is the same as that of Example 1, the difference is that:

[0043] (1) In step A: the polyolefin substrate and the inorganic filler are blended and extruded at a mass ratio of 9:11 to obtain a composite material and granulated. The polyolefin substrate is a mixture of metallocene polyethylene and linear low-density polyethylene with a mass ratio of 4:1. Among them, metallocene polyethylene uses a melt index of 3.5g / 10min and a density of 0.927. Linear low density polyethylene uses a melt index of 2.3g / 10min and a density of 0.917. The inorganic filler is: inorganic particles with a particle diameter of 3-5 μm and a particle size distribution of more than 80%. The inorganic filler is a mixture of calcium carbonate and titanium dioxide with a mass ratio of 50:1.

[0044] (2) The basis weight of the prepared product is 25gsm;

[0045] Relevant performance tests were ...

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Abstract

The invention relates to the field of organic polymer films, in particular to a moisture permeable polyolefin micropore breathable film which is prepared from a polyolefin substrate filled with inorganic packing through procedures of curtain coating extrusion, drawing and heat setting filming. The invention provides the moisture permeable polyolefin micropore breathable film of which the basis weight is within 18-25 gsm. The result of a GB / T 1037 test shows that the water vapor transmission rate can be greater than 8000 g / m<2>.24h. Meanwhile, the water vapor transmission rate of the moisture permeable polyolefin micropore breathable film at a first hour can be up to 1000 g / m<2>.h. The moisture permeable polyolefin micropore breathable film can be used in a use environment of a sanitary article, the moisture adjustment property of the sanitary article can be effectively improved, and the use experience of a user can be improved.

Description

technical field [0001] The invention relates to the technical field of organic polymer films, in particular to a high moisture permeability polyolefin microporous gas permeable film. Background technique [0002] In recent years, with the improvement of people's consumption level, the use of various personal hygiene products has become more and more popular; and the product structure and appearance homogeneity of sanitary products have increasingly troubled sanitary product manufacturers; [0003] Recently, manufacturers of hygiene products have put forward requirements for improving the comfort of products on the basis of ensuring the functionality of hygiene products, that is, on the basis of not leaking after absorbing liquid. [0004] In the process of improving product comfort, manufacturers mainly use skin-friendly and soft fabrics to reduce skin irritation; use lighter and thinner core structures to reduce clothing requirements and improve user experience; use The bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08K3/26C08K3/22C08J5/18B29D7/01
CPCB29D7/01C08J5/18C08J2323/06C08J2423/08C08L23/06C08L2203/16C08L2205/02C08L23/0815C08K2003/265C08K2003/2241
Inventor 许雍郭长华张爱华汪洋陆军
Owner SHANGHAI ZIHUA FILM TECH CO LTD
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