阅读说明：本技术 一种抗菌高分散滑石粉的制备方法 (Preparation method of antibacterial high-dispersion talcum powder ) 是由 韦明 于 2020-06-12 设计创作，主要内容包括：本发明公开了一种抗菌高分散滑石粉的制备方法,将滑石粉粉碎,加入水混合并不断搅拌均匀,制得滑石粉浆料；将浆料加入球磨机,再加入季戊四醇硬脂酸酯、三聚氰胺、聚氨丙基甲基倍半硅氧烷和咪唑啉型磷酸酯钠盐组成的复配改性剂,球磨进行表面改性,得改性浆料；再输送至压滤机脱水,再加入粉体改性机,加入壳聚糖、十六烷基二甲基苄基氯化铵和8-羟基喹啉铜组成的抗菌剂进行二次表面改性,经干燥,粉碎,制得抗菌高分散滑石粉。本方法制备的滑石粉具有很好的分散性、加工性能、抑菌抗菌性能,与有机填料或纤维之间具有很好的相容性,界面结合力良好,填充后使制品具有很好的机械性能及抗菌性,可作为优异的塑料、涂料或造纸填料。(The invention discloses a preparation method of antibacterial high-dispersion talcum powder, which comprises the steps of crushing talcum powder, adding water, mixing and continuously stirring uniformly to prepare talcum powder slurry; adding the slurry into a ball mill, adding a compound modifier consisting of pentaerythritol stearate, melamine, poly (aminopropyl methyl silsesquioxane) and imidazoline type phosphate sodium salt, and carrying out ball milling for surface modification to obtain modified slurry; and then conveying the mixture to a filter press for dehydration, adding a powder modifying machine, adding an antibacterial agent consisting of chitosan, hexadecyl dimethyl benzyl ammonium chloride and 8-hydroxyquinoline copper for secondary surface modification, drying and crushing to obtain the antibacterial high-dispersion talcum powder. The talcum powder prepared by the method has good dispersibility, processability, antibacterial and antibacterial properties, good compatibility with organic fillers or fibers, and good interface bonding force, and the filled product has good mechanical properties and antibacterial properties, and can be used as excellent plastic, paint or papermaking filler.)

1. A preparation method of antibacterial high-dispersion talcum powder is characterized by comprising the following steps: the method comprises the following steps:

s1: pulverizing pulvis Talci, adding water, mixing, and stirring to obtain pulvis Talci slurry;

s2: adding the talcum powder slurry into a ball mill, adding a compound modifier consisting of pentaerythritol stearate, melamine, poly (aminopropyl methyl silsesquioxane) and imidazoline type sodium phosphate, and carrying out ball milling for surface modification to obtain modified slurry;

s3: and (3) conveying the modified slurry to a filter press for dehydration, adding a powder modifying machine, adding an antibacterial agent consisting of chitosan, hexadecyl dimethyl benzyl ammonium chloride and 8-hydroxyquinoline copper for secondary surface modification, drying and crushing to obtain the antibacterial high-dispersion talcum powder.

2. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the addition amount of the compound modifier is 1-4% of the weight of the talcum powder.

3. The method for preparing antibacterial high-dispersion talc according to claim 2, wherein: the mass ratio of pentaerythritol stearate, melamine, polyaminopropyl methyl silsesquioxane to imidazoline type phosphate sodium salt in the compound modifier is 3-5:3-5:1-3: 1-3.

4. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the addition amount of the antibacterial agent is 0.5-1.5% of the mass of the talcum powder.

5. The method for preparing antibacterial high-dispersion talcum powder according to claim 4, which is characterized by comprising the following steps of: the mass ratio of the chitosan, the hexadecyl dimethyl benzyl ammonium chloride and the 8-hydroxyquinoline copper in the antibacterial agent is 2-5:0.5-2.0: 0.5-2.0.

6. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the crushing is carried out until the powder is crushed to 200 meshes and 400 meshes.

7. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the water adding amount is 4-6 times of the mass of the talcum powder.

8. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the surface modification is ball milling for 20-30min at the rotating speed of 300-500 r/min.

9. The method for preparing antibacterial high-dispersion talcum powder according to claim 1, which is characterized by comprising the following steps of: the drying is realized by adopting a pulse airflow dryer; the feeding speed of the drying is 200-300kg/h, the drying temperature is 80-110 ℃, and the wind speed is 10-15 m/s.

Technical Field

The invention relates to the technical field of preparation of non-metallic mineral fillers, in particular to a preparation method of antibacterial high-dispersion talcum powder.

Background

The pulvis Talci is magnesium silicate mineral talc family pulvis Talci, and its main ingredient is hydrous magnesium silicate of pulvis Talci, and its molecular formula is Mg₃[Si₄O₁₀](OH)₂. Talc belongs to the monoclinic system. Talc powder has excellent physical and chemical properties such as lubricity, anti-sticking property, flow-assisting property, fire resistance, acid resistance, insulation property, high melting point, chemical inactiveness, good covering power, softness, good luster, strong adsorption power and the like, and talc powder has a tendency to easily break into flakes and a special lubricating property because of its layered crystal structure. Therefore, talc powder is widely used in the fields of rubber, plastics, paper making, coatings, paints, inks, cables, building products, and the like.

When the talcum powder is used as a chemical filler, the strength, heat resistance and whiteness of a product can be improved, but the surface of the talcum powder has stronger hydrophilic hydroxyl groups and stronger alkalinity, and due to the hydrophilic and oleophobic properties, the talcum powder and an organic high polymer or fiber have poor hydrophilicity, and are easy to form aggregates, so that the internal dispersion is uneven, the interface defect between the two materials is caused, and the direct application effect is poor. The present technological development for talc fillers is increasingly extensive and intensive, but generally has several problems: firstly, the process of modifying the talcum powder filler is complex, the agglomeration problem still exists, and the cost is too high; secondly, the modification effect of the cubic stone powder filler is not obvious, and the strength performance of the product is greatly reduced along with the addition of the filler; thirdly, the stability of the modified filler is not enough, the bonding force between the talcum powder and the fiber and between the talcum powder and the plastic and paint base materials is poor, interface defects are easily caused, the talcum powder is easy to fall off, and the performance of the material is reduced. With the increasing awareness of people on health and environmental protection, the requirements of bacteriostasis and sterilization are provided for paper, paint and plastic products which frequently contact in daily life, so that the improvement of the antibacterial property of the talcum powder is the demand of the current market.

Disclosure of Invention

The invention provides a preparation method of antibacterial high-dispersion talcum powder, aiming at overcoming the problems of the existing kaolin. According to the method, pentaerythritol stearate, melamine, poly (aminopropyl methyl silsesquioxane) and imidazoline type sodium phosphate are adopted to modify the surface of the talcum powder, so that the dispersibility and compatibility of the talcum powder can be improved, and the bonding force between the talcum powder and fibers and organic base materials is improved; and the antibacterial property of the talcum powder can be improved by secondarily modifying the talcum powder by chitosan, hexadecyl dimethyl benzyl ammonium chloride and 8-hydroxyquinoline copper.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

a preparation method of antibacterial high-dispersion talcum powder comprises the following steps:

s1: pulverizing pulvis Talci, adding water, mixing, and stirring to obtain pulvis Talci slurry;

s2: adding the talcum powder slurry into a ball mill, adding a compound modifier consisting of pentaerythritol stearate, melamine, poly (aminopropyl methyl silsesquioxane) and imidazoline type sodium phosphate, and carrying out ball milling for surface modification to obtain modified slurry;

s3: and (3) conveying the modified slurry to a filter press for dehydration, adding a powder modifying machine, adding an antibacterial agent consisting of chitosan, hexadecyl dimethyl benzyl ammonium chloride and 8-hydroxyquinoline copper for secondary surface modification, drying and crushing to obtain the antibacterial high-dispersion talcum powder.

Further, the addition amount of the compound modifier is 1-4% of the weight of the talcum powder.

Furthermore, the mass ratio of pentaerythritol stearate, melamine, polyaminopropyl methyl silsesquioxane to imidazoline type sodium phosphate salt in the compound modifier is 3-5:3-5:1-3: 1-3.

Furthermore, the addition amount of the antibacterial agent is 0.5-1.5% of the mass of the talcum powder.

Further, the mass ratio of the chitosan, the hexadecyl dimethyl benzyl ammonium chloride and the 8-hydroxyquinoline copper in the antibacterial agent is 2-5:0.5-2.0: 0.5-2.0.

Further, the pulverization is performed to 200-400 mesh.

Furthermore, the water adding amount is 4-6 times of the mass of the talcum powder.

Further, the surface modification is ball milling for 20-30min at the rotating speed of 300-500 r/min.

Further, the drying is drying by adopting a pulse airflow dryer; the feeding speed of the drying is 200-300kg/h, the drying temperature is 80-110 ℃, and the wind speed is 10-15 m/s.

Compared with the prior art, the invention has the advantages and beneficial effects that:

1. according to the method, the talcum powder is modified by the modifier consisting of pentaerythritol stearate, melamine, polyamino propyl methyl silsesquioxane and imidazoline type sodium phosphate salt to form an organic-inorganic hybrid network structure, so that the talcum powder, organic groups such as plastics, paper making and coatings and fibers form a bridging network structure, and the compatibility and the bonding force between the talcum powder and other fillers are improved; and the dispersibility and the processability of the talcum powder are improved, the oil absorption value of the product is reduced, and the problem that the talcum powder is easy to agglomerate is solved.

2. The method of the invention also carries out secondary modification by an antibacterial agent consisting of chitosan, hexadecyl dimethyl benzyl ammonium chloride and 8-hydroxyquinoline copper, can improve the antibacterial and bacteriostatic properties of the talcum powder, accords with the pursuit of modern people for antibacterial products, and has wide market prospect.

3. The method adopts the pulse airflow dryer to dry the talcum powder, so that the drying and heating are uniform, the efficiency is high, the modifier can be better coated on the surface of the talcum powder, and the dispersion of the talcum powder is facilitated.

4. The talcum powder prepared by the method has good dispersibility, processability, antibacterial and bacteriostatic properties, good compatibility with organic fillers or fibers and good interface bonding force, and the products have good mechanical properties and antibacterial properties after being filled, can be used as excellent plastics, coatings or papermaking fillers, and have good market application prospects.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.