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Special-performance breathable film and production process thereof

A breathable film and performance technology, applied in the field of breathable film, can solve the problems that affect the use of breathable film, pull out holes in the breathable film, increase the stretching ratio, etc., and achieve the effect of high water pressure resistance, improved efficiency, and low elastic modulus

Inactive Publication Date: 2018-06-01
聚石化学(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the increase of the stretching ratio will easily make the breathable film be pulled out of the hole during the stretching process, which will affect the use of the breathable film.
[0006] Patent application number CN201310455190.1 proposes a special WVTR breathable film and its production process. This patent is mainly aimed at the problems of unstable air flow and large air flow of the breathable film used in the warm sticker market. Three extruders are proposed to prepare three layer of breathable film, and the total film weight of each layer is controlled, and the calcium carbonate (CaCO3) added to each layer 3 ) and polyethylene (PE) for control

Method used

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Embodiment Construction

[0018] The following specific embodiments describe the present invention in more detail:

[0019] To produce a breathable film with special properties, the preparation of the breathable masterbatch: 45% by weight of LLDPE, 50% of CaCO 3 and 5% antioxidant and lubricant into the mixing tank, and stirred, then transported in the twin-screw extruder, melt extrusion, underwater pelletizing, dehydration and drying; the total weight of these four kinds of raw materials is 100kg, And the stirring time is 30 minutes; the processing temperature of the twin-screw extruder is: feeding section: 160°C; melting section: 210°C; metering section: 210°C; die head temperature: 220°C; The temperature is 80°C; the drying temperature is 90°C.

[0020] For large diameter screw extruders, raw materials are added with 25% LLDPE, 7% LDPE and 100% breathable masterbatch; for small diameter screw extruders, raw materials are added with 10% LLDPE, 4% LDPE and 100% breathable Masterbatch.

[0021] The ...

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Abstract

The invention discloses a special-performance breathable film and a production process. The special-performance breathable film and the production process are characterized in that the breathable filmcomprises three film layers formed by co-extrusion through two extruders; two of the three film layers share one extruder; and the structure of the three film layers is adjusted by a distributor. After co-extrusion of the three film layers, cooling, preheating, two-stage stretching, heat setting, corona treatment and rolling are conducted. According to the special-performance breathable film andthe production process, high strength, high water pressure resistance, low elasticity modulus and high water vapor permeability of the breathable film are ensured effectively under the condition of thinning.

Description

technical field [0001] The invention relates to a breathable membrane with special performance and a production process thereof. Background technique [0002] Breathable film is widely used in disposable sanitary products such as diapers and medical protective clothing because of its breathable and impermeable characteristics. [0003] According to statistics, in 2015, the number of newborns aged 0-2 in my country was about 39.17 million, the sales volume of diapers was about 27 billion pieces, and the market size was about 33.2 billion yuan. With the gradual implementation of the national "universal two-child" policy, the growth of newborns is expected to accelerate. In recent years, the penetration rate of my country's baby diaper market has increased significantly, but compared with the market penetration rate of more than 90% in the United States, Japan and other developed countries, the market penetration rate of my country's baby diapers is still low. In the future, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/06B29C47/10B29C55/02B29L7/00
CPCB29C48/0018B29C48/08B29C48/18B29C48/286B29C55/023B29L2007/00
Inventor 牟川剑
Owner 聚石化学(长沙)有限公司
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