Preparation method of chitosan-coated heavy calcium carbonate anti-microbial filler for breathable film

A technology of heavy calcium carbonate and chitosan, which is applied in the fields of composite materials, functional materials, and non-metallic mineral deep processing and utilization, and can solve problems such as low strength of the composite film, failure to meet the use requirements, and the lack of toxicity of grinding aids. , to achieve uniform powder dispersion, prevent bacterial infection, and good coating effect

Inactive Publication Date: 2017-05-17
四川云科微纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 dispersed unevenly in the composite film, which will cause color difference and stains in the breathable film and affect the quality
And the preparation of chitosan composite heavy calcium carbonate filler has not yet been reported, the inventor aims at the deficiency of current heavy calcium carbonate powder filler, especially the problem and defect that traditional heavy calcium is used in the production of air-permeable film, provides a kind of brand-new Production and preparation scheme of heavy calcium carbonate functional filler

Method used

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  • Preparation method of chitosan-coated heavy calcium carbonate anti-microbial filler for breathable film
  • Preparation method of chitosan-coated heavy calcium carbonate anti-microbial filler for breathable film

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preparation example Construction

[0032] A preparation method of chitosan-coated ground calcium carbonate antibacterial filler for air-permeable film, 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, polymer surfactant is added. According to the weight ratio, marble powder: water: polymer surfactant = 1: 0.2 ~ 1.5: 0.001 ~ 0.1 to 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 , stirre...

Embodiment 1

[0050] Select 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 host machine is 1100r / min, the speed of the fan is 4000r / min) and get D in the dust collector. 50 50μm marble powder;

[0051] Take 4 tons of pure water, add sodium polycarboxylate (commercially available Rohm and Haas 9400) 100kg, mix well in the premix tank, and gradually add 6 tons The obtained marble powder is continuously stirred to make a premixed slurry;

[0052] ③Put 800kg of zirconia balls with a diameter of 1.2mm, 1200kg of zirconia balls with a diameter of 2.2mm, and 2000kg of zirconia balls with a diameter of 3.8mm in the vertical stirring tank, and pump them step by step Prepare the premixed slurry and simultaneously start the agitator from slow to fast, and stir for 1.5h at a stirring speed of 1800r / min;

[0053] ④The stirred mixture is filtered through 100 mesh, and the stirring medium (...

Embodiment 2

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

[0059] Take 2.5 tons of pure water, add sodium polyacrylate (commercially available molecular weight greater than 10,000) 120kg and mix evenly in the premix tank, gradually add 5.5 tons The obtained powder is continuously stirred to make a premixed 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 stirring tank, and pump them step by step Prepare the premixed slurry and simultaneously start the agitator from slow to fast, and stir for 2 hours at a stirring speed of 1200r / min;

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

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Abstract

The invention discloses a preparation method of a chitosan-coated heavy calcium carbonate anti-microbial filler for a breathable film. The preparation method mainly comprises the following steps of crushing, homogenizing, grinding, drying and modifying, and has the beneficial effects that by doping chitosan during a production process, a certain anti-microbial performance is endowed to composite powder; meanwhile, a hydrophobic property of the chitosan is beneficial for surface modification of calcium carbonate powder, so that the prepared calcium carbonate composite powder is good in surface sphericity, and uniform in particle size distribution. The preparation method provided by the invention is simple and convenient in technological operation, low in cost, and suitable for industrial large-scale production.

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 preparation method of chitosan-coated heavy calcium carbonate antibacterial filler for air-permeable membranes. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K9/04C08K9/06C08K7/18C08K3/26
CPCC08K9/10C08K3/26C08K7/18C08K9/04C08K9/06C08K9/08C08K2003/265C08K2201/003C08K2201/006
Inventor 毛继红
Owner 四川云科微纳科技有限公司
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