Coarse whiting filler for gas-permeable membrane and preparation method of coarse whiting filler

Abstract

The invention belongs to the field of deep processing and utilization of nonmetal minerals, composite materials and functional materials, and particularly relates to coarse whiting filler for a gas-permeable membrane and a preparation method of the coarse whiting filler. The invention aims to provide the preparation method of the coarse whiting filler for the gas-permeable membrane. The preparation method comprises the following steps: crushing marble until the diameter is 40 to 70 micrometers; uniformly mixing marble powder, water and a high-molecular surfactant at a weight ratio of 1:(0.2-1.5):(0.001-0.1); ball-milling and filtering; dehydrating until the water content is not larger than 1%; dismissing gathered powder; drying until the water content is not larger than 0.2%; adding an activating agent of which the weight is 0.5% to 3% of the total weight of the dried powder material; fully reacting at the temperature of 110 to 140 DEG C; and cooling, uniformly mixing and packaging. The coarse whiting filler prepared by the method disclosed by the invention is good in performance and can be well applied to preparation of the gas-permeable membranes and relevant products.

Description

technical field [0001] The invention belongs to the field of deep processing and utilization of non-metallic minerals, composite materials and functional materials, and in particular relates to a heavy calcium carbonate filler for a breathable membrane and a preparation method thereof. Background technique [0002] With the progress of society and the improvement of people's living standards, in the fields of daily life, medical care, and special industrial protection, the use and scope of disposable products have gradually expanded. In 2013, the sales of disposable products in my country have reached 30 billion yuan. People put forward higher and higher requirements for the use comfort of disposable products, and the air permeability of disposable products directly determines the use comfort of the products. Most disposable products require a large amount of plastic film materials. Traditional plastic films are airtight. How to conveniently improve the air permeability of t...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the wide particle size distribution, the prepared composite film has low strength and cannot meet the requirements for use. The particles have obvious edges and corners, and the prepared composite film will irritate the skin;

[0006] 2. The prepared composite film will form a large number of pinhole defects in the process of stretching and forming holes, and the pinholes will cause liquid to pass through the film;

[0007] 3. The air permeability of the breathable film made is unstable, forming a local airtight area;

[0009] 5. The grinding aid used for the filler does not consider toxicity and cannot meet the hygienic requirements of the breathable membrane;

[0010] 6. The filler is unevenly dispersed in the composite film, causing color difference and stains in the breathable film and affecting the quality

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