Raw material composition for preparing blown breathable film, blown breathable film and preparation of blown breathable film

Abstract

The invention provides a raw material composition for preparing a blown breathable film, a blown breathable film and preparation of the blown breathable film. The raw material composition comprises the following ingredients in percentage by weight (100% in total): 50-70% of inorganic filler coated with a coupling agent on the surface, 25-50% of linear low density polyethylene and 0.2-1.0% of antioxidant, wherein linear low density polyethylene comprises 1-3 kinds of linear low density polyethylene in different densities; density distribution of linear low density polyethylene in the differentdensities is 0.910-0.935g/cm<3>; and melting index distribution at 190 DEG C is 2.5-0.5g/10min. The invention further provides a masterbatch of the blown breathable film, which is prepared from the raw material composition. The invention further provides a blown breathable film which is prepared by blowing the masterbatch to form a film by a film blowing method and then performing unilateral stretching on the film. The blown breathable film is excellent in comprehensive performance and lower in cost.

Description

technical field [0001] The invention relates to a raw material composition for preparing a blown film breathable film, a blown film breathable film and the preparation thereof, belonging to the technical field of medical products. Background technique [0002] With the improvement of people's living standards, the liberalization of China's two-child policy, and the aging of China's population, the popularity and consumption of disposable sanitary products including sanitary napkins, baby diapers, and adult diapers have increased significantly; microporous waterproof The breathable film is the base film for preparing the above-mentioned products, which is used to achieve the effect of waterproof and breathable. With a thickness of 0.1-5 μm, these micropores can allow water vapor and air to pass through, and at the same time can effectively block the penetration of liquids such as water; air permeability is the main functional indicator of paper diapers. [0003] At present, ...

AI Technical Summary

Problems solved by technology

Among them, the former includes: the raw materials of the breathable film are mixed, and then stretched at a certain temperature by extrusion, granulation, and casting into sheets, as shown in Chinese patent CN104558795A, which discloses a casting method to prepare poly The method of olefin gas permeable membrane, the method obtains the gas permeable membrane with high moisture permeability by controlling the particle size of the inorganic filler; however, the gas permeable membrane prepared by casting method has the disadvantages of hydrostatic pressure resistance and insufficient physical strength, It will cause liquid leakage during use. Many manufacturers increase the thickness of the breathable membrane or increase the weight of the membrane in order to improve the hydrostatic pressure resistance of the breathable membrane. It began to be promoted in China in 2010, because of the particularity of the raw materials used, it can achieve higher stretching ratio, lower gram weight (weight per square meter of film), higher water vapor transmission rate, and larger width. Wide, and then can reduce the cost of raw materials while improving the performance of the breathable film, specifically as shown in Chinese patent CN107674283A, which discloses a method for preparing a breathable film by blown film method, which makes the breathable film lighter and thinner by biaxial stretching process , to improve the air permeability of the breathable membrane

However, the formula of the blown film method breathable film currently on the market is not perfect, mainly reflected in the low water permeability and low longitudinal tensile strength.

From the point of view of raw material production process, the main problems of raw material production at present are low yield, high pressure of extrusion head, high melt temperature, easy to cause wear of melt pump and high temperature crosslinking of raw materials

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