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

A technology of heavy calcium carbonate and gas-permeable membranes, applied in fibrous fillers, chemical instruments and methods, and inorganic pigment treatment, etc., can solve the problem of color difference and spots of gas-permeable membranes, low strength of composite membranes, uneven dispersion of fillers in composite membranes, etc. problem, to achieve the effect of good sphericity and narrow particle size distribution

Active Publication Date: 2015-04-22
SICHUAN SHIMIAN JUFENG POWDER
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  • Abstract
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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

Method used

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

Examples

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preparation example Construction

[0032] A preparation method for a breathable membrane with heavy calcium carbonate filler, comprising the following steps:

[0033] a. The selected marble with calcium carbonate content ≥ 99% is multi-stage crushed to a diameter of 3-10mm. If it is too fine, it will easily introduce other impurities, and if it is too large, it will easily cause low grinding efficiency; then grind it in a dry state to a diameter of 40-10mm. 75μm, get marble powder;

[0034] b. In order to improve the grinding efficiency and drying efficiency, add a polymer surfactant, by weight, marble powder: water: polymer surfactant = 1: 0.2~1.5: 0.001~0.1 Mix the three; Grind the calcium carbonate powder specially for the membrane to the required index and save the grinding time, and then add any one of alumina ceramic balls, corundum balls or zirconia balls with a diameter of 1-20 mm and accounting for 30-55% of the total weight of the three , stirred for 1 to 5 hours, the stirring speed was 500 to 6000r / ...

Embodiment 1

[0050] ①Choose marble ore with calcium carbonate content ≥ 99%, crush it into small pieces with a diameter of 3mm, and put it into the ring rolling mill (the speed of the main machine is 1100r / min, the speed of the fan is 4000r / min) and get D in the dust collector. 50 50μm marble powder;

[0051] ② Take 4 tons of pure water, add 100 kg of sodium polycarboxylate (commercially available Rohm and Haas 9400) and mix evenly in a premix tank, gradually add 6 tons of marble powder obtained in step ① and keep stirring to make a premix slurry;

[0052] ③Put 800kg of zirconia balls with a diameter of 1.2mm, 1,200kg of zirconia balls with a diameter of 2.2mm, and 2,000kg of zirconia balls with a diameter of 3.8mm in the vertical mixing tank. Stirrer, stirring at a stirring speed of 1800r / min for 1.5h;

[0053] 4. The mixture after stirring is filtered through 100 meshes, and the stirring medium (reusable after cleaning) and coarse particles are filtered out to obtain about 9.3 tons of c...

Embodiment 2

[0058] ①Choose marble ore with calcium carbonate content ≥ 99%, crush it into small pieces with a diameter of 8mm and put it into a ball mill (the speed of the main machine is 600r / min, the speed of the fan is 2000r / min) and get D in the dust collector 50 40μm marble powder;

[0059] ② Take 2.5 tons of pure water, add 120 kg of sodium polyacrylate (commercially available molecular weight greater than 10,000) and mix evenly in a premix tank, gradually add 5.5 tons of powder obtained in step ① and keep stirring to make a premix slurry;

[0060] ③Put 1200kg of zirconia balls with a diameter of 2mm, 800kg of zirconia balls with a diameter of 4mm, and 700kg of zirconia balls with a diameter of 6mm in the vertical mixing tank, gradually pump the premixed slurry prepared in step ② and open it from slow to fast at the same time Stirrer, stirring at a stirring speed of 1200r / min for 2h;

[0061] 4. the mixture after the stirring and grinding is filtered through a gap of 80 meshes, and...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08C09C3/10C09C3/12
Inventor 李龙山张直李静波刘武黄云华杨信强陈绍清李琰吉
Owner SICHUAN SHIMIAN JUFENG POWDER
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