阅读说明：本技术 一种耐污染的板蓝根改性pp母粒及其制备方法 (Pollution-resistant isatis root modified PP master batch and preparation method thereof ) 是由 黄效华 郑天勇 姜义军 甄丽 刘彦明 伏广伟 汪培育 于 2020-06-30 设计创作，主要内容包括：本发明提供一种耐污染的板蓝根改性PP母粒及其制备方法,制备方法包括板蓝根提取物预处理步骤：包括选择板蓝根提取物、高温处理、微波处理步骤；所述的高温处理：处理温度为180-190℃,处理时间为15-20s；所述微波处理：微波频率为20-24GH。还包括板蓝根提取物改性步骤：将预处理后的板蓝根提取物加入去离子水中,采用1800-2000rpm的转速搅拌15-20min,完全溶解,浴比1:15-20。将山竹多酚、沙棘黄酮依次加入到板蓝根提取物溶液中,将溶解液加热至90-95℃并进行超声辅助分散。(The invention provides a pollution-resistant isatis root modified PP master batch and a preparation method thereof, wherein the preparation method comprises the isatis root extract pretreatment steps: comprises the steps of selecting an isatis root extract, carrying out high-temperature treatment and microwave treatment; the high-temperature treatment comprises the following steps: the treatment temperature is 180 ℃ and 190 ℃, and the treatment time is 15-20 s; the microwave treatment comprises the following steps: the microwave frequency is 20-24 GH. Also comprises the modification step of the isatis root extract: adding the pretreated radix Isatidis extract into deionized water, stirring at 1800-2000rpm for 15-20min for complete dissolution at a bath ratio of 1: 15-20. Sequentially adding mangosteen polyphenol and seabuckthorn flavone into the isatis root extract solution, heating the dissolved solution to 90-95 ℃, and performing ultrasonic-assisted dispersion.)

1. A preparation method of pollution-resistant isatis root modified PP master batch is characterized by comprising the following steps: comprises a step of pretreating the isatis root extract; the isatis root extract pretreatment: comprises the steps of selecting an isatis root extract, carrying out high-temperature treatment and microwave treatment; the high-temperature treatment comprises the following steps: the treatment temperature is 180 ℃ and 190 ℃, and the treatment time is 15-20 s; the microwave treatment comprises the following steps: the microwave frequency is 20-24 GH.

2. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 1, wherein the preparation method comprises the following steps: the microwave treatment comprises the following steps: the treatment time is 100-150 s; cooling radix Isatidis extract to 0-2 deg.C at a speed of 4-5 deg.C/min after microwave treatment; then keeping the temperature for 1-2h, and then naturally heating to 25-28 ℃.

3. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 1, wherein the preparation method comprises the following steps: the isatis root extract: 100 percent of the mixture is sieved by a 800-mesh sieve, the content of active ingredients is 97.8 to 98.2 percent, the water content is 5 to 6 percent, and the total number of colonies is less than 100 cfu/g.

4. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 1, wherein the preparation method comprises the following steps: also comprises a modification step of the isatis root extract; modification of the isatis root extract: adding the pretreated radix Isatidis extract into deionized water, stirring at 1800-2000rpm for 15-20min for complete dissolution at a bath ratio of 1: 15-20.

5. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 4, wherein the preparation method comprises the following steps: modification of the isatis root extract: sequentially adding mangosteen polyphenol and seabuckthorn flavone into the isatis root extract solution; stirring at 1800 plus 2000rpm for 30-40min to obtain the solution.

6. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 5, wherein the preparation method comprises the following steps: modification of the isatis root extract: heating the dissolved solution to 90-95 ℃ and carrying out ultrasonic-assisted dispersion with the ultrasonic frequency of 30-38KHz and the dispersion time of 90-100 s; after dispersion, the solution is cooled to 25-35 ℃.

7. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 4, wherein the preparation method comprises the following steps: modification of the isatis root extract: the adding amount of mangosteen polyphenol is 2.8-3.1% of the isatis root extract solution; the addition amount of the seabuckthorn flavone is 1.9-2.5% of the isatis root extract solution.

8. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 1, wherein the preparation method comprises the following steps: also comprises the step of preparing a functional modifier; the preparation of the functional modifier comprises the following steps: the mass ratio of the carrier agent to the modified isatis root extract solution is 1: 8-10.

9. The preparation method of the contamination-resistant isatis root modified PP master batch according to claim 8, wherein the preparation method comprises the following steps: the preparation of the functional modifier comprises the following steps: the loading agent comprises the following raw material components in parts by weight: 4-5 parts of nano bentonite, 0.5-1 part of magnesium stearate and 7-10 parts of nano active carbon.

10. The preparation method of the pollution-resistant isatis root modified PP master batch as claimed in claim 1, wherein the preparation method comprises the following steps: also comprises a step of preparing functional mother granules; the preparation of the functional master batch comprises the following steps: the mass ratio of the adopted PP slices, the functional modifier, the antioxidant 1076, the tert-butyl p-hydroxyanisole and the polyoxyethylene ether is 100: 6-6.8: 1.5-2.5: 1.1-1.3: 0.5-0.6.

Technical Field

The invention belongs to the technical field of fiber manufacturing, and particularly relates to a pollution-resistant isatis root modified PP master batch and a preparation method thereof.

Background

With the continuous improvement of living standard of people, the functional requirements of people on daily fabrics are also improved. Antimicrobial properties are one of the properties of great concern. The antibacterial modification technology of PP master batch is also an important aspect of research of technicians in recent years. The traditional antibacterial means is to add inorganic antibacterial agents, organic antibacterial agents and natural antibacterial agents. Among them, natural antibacterial agents are the most sought and loved antibacterial means due to their characteristics of being green, plant-derived, harmless, etc. However, the application process of natural antibacterial agents is not as mature as that of inorganic antibacterial agents and organic antibacterial agents in industrial application. The existing natural antibacterial agent has the technical problems of poor antibacterial effect, instability, easy failure and the like. The isatis root is a hot spot of related research in the field as a natural antibacterial substance. Meanwhile, in order to seek comfort, people need to improve the water absorption of the PP master batch, but the water absorption of the PP master batch in the prior art is very poor, and is generally about 0.01 percent.

Patent CN201710646998.6 provides a preparation method of biomass antibacterial PP master batch, a product and an application thereof, wherein the biomass antibacterial PP master batch comprises a blending component of matrix resin, a biomass antibacterial agent, 1-5 wt% of a lubricant and 0.05-0.2 wt% of a composite antioxidant: the biomass antibacterial agent mainly comprises the following components of dried Chinese mahonia fruits, leaves and roots according to the weight percentage of the fruits: leaf: the biomass material with the antibacterial effect is mineralized by amorphous minerals with the root =1: 2-5: 3-7, and the biomass material accounts for 10-30 wt% of the master batch; firstly, placing matrix resin, a lubricant and a biomass antioxidant in a high-speed mixer and stirring the mixture uniformly; then adding the biomass antibacterial agent, mixing the mixture at high speed until the mixture is uniform, and then adopting a double-screw extruder to prepare the composite material. The antibacterial master batch prepared by the method has higher antibacterial rate, is used for antibacterial modification of polypropylene, and solves the problem that the biomass antibacterial agent cannot be processed at high temperature.

Disclosure of Invention

In order to solve the problems in the prior art and further optimize the prior art, the invention provides a pollution-resistant isatis root modified PP master batch and a preparation method thereof, which aim to realize the following purposes:

the antibacterial stability and the water washing resistance of the isatis root modified PP master batch are improved; improve the water absorption performance and the pollution resistance performance.

In order to solve the technical problems, the invention adopts the following technical scheme:

a preparation method of pollution-resistant isatis root modified PP master batch comprises the following steps:

step 1, radix isatidis extract pretreatment

(1) Selecting radix Isatidis extract

Selected isatis root extract: 100 percent of the mixture is sieved by a 800-mesh sieve, the content of active ingredients is 97.8 to 98.2 percent, the water content is 5 to 6 percent, the total number of colonies is less than 100cfu/g, salmonella and escherichia coli can not be detected, and the shelf life is 24 months.

(2) High temperature treatment

Mixing the radix Isatidis extract, and treating at 190 deg.C and 180 deg.C for 15-20 s; and (4) conducting instantaneous high-temperature treatment, guiding the isatis root extract out, and cooling to normal temperature for later use.

(3) Microwave treatment

Treating the heat-treated radix Isatidis extract in a microwave device at 20-24GH for 100-; guiding out after microwave treatment, and cooling radix Isatidis extract to 0-2 deg.C at a speed of 4-5 deg.C/min; then keeping the temperature for 1-2h, and then naturally heating to 25-28 ℃ for later use.

Step 2, modifying the isatis root extract

(1) Dissolution

Adding the pretreated radix Isatidis extract into deionized water, stirring at 1800-2000rpm for 15-20min for complete dissolution at a bath ratio of 1: 15-20; to obtain the isatis root extract solution.

(2) Adding modifying substances

Sequentially adding mangosteen polyphenol and seabuckthorn flavone into the isatis root extract solution; stirring at the rotation speed of 1800 plus 2000rpm for 30-40 min; then, heating the dissolved solution to 90-95 ℃ and carrying out ultrasonic-assisted dispersion, wherein the ultrasonic frequency is 30-38KHz, and the dispersion time is 90-100 s; after dispersion, the temperature of the dissolved solution is reduced to 25-35 ℃ to obtain the modified isatis root extract solution.

The adding amount of mangosteen polyphenol is 2.8-3.1% of the isatis root extract solution;

the addition amount of the seabuckthorn flavone is 1.9-2.5% of the isatis root extract solution.

Step 3, preparing a functional modifier

Mixing the carrier agent and the modified isatis root extract solution according to the mass ratio of 1: 8-10; then heating the mixed solution to 90-100 ℃, and stirring for 50-60min at the speed of 4000-4500 rad/min; then cooling to 60-64 ℃, stirring at 2800 and 3000rad/min for 20-30 min; then cooling to 25-35 ℃; distilling under reduced pressure for 40-50min to obtain the functional modifier.

The loading agent comprises the following raw material components in parts by weight: 4-5 parts of nano bentonite, 0.5-1 part of magnesium stearate and 7-10 parts of nano active carbon; the carrier agent comprises: 100 percent of the powder is sieved by a 8000-mesh sieve.

Step 4, preparing functional master batch

Mixing PP slices, a functional modifier, an antioxidant 1076, tert-butyl p-hydroxyanisole and polyoxyethylene ether, and drying for 24 hours at the temperature of 120-; then adding the mixture into a double-screw extruder, controlling the melting temperature to be 220-250 ℃, carrying out melt blending for 40-50min, controlling the screw rotating speed to be 320-350 r/min, carrying out high-speed mixing, and carrying out extrusion granulation to obtain the functional master batch.

The PP slices, the functional modifier, the antioxidant 1076, the tert-butyl p-hydroxyanisole and the polyoxyethylene ether are mixed according to the mass ratio of 100: 6-6.8: 1.5-2.5: 1.1-1.3: 0.5-0.6.

By adopting the technical scheme, the invention has the beneficial effects that:

1. the isatis root modified PP master batch prepared by the invention has good bacteriostatic effect; the master batch has the bacteriostasis rate of over 96 percent on staphylococcus aureus, escherichia coli and candida albicans; particularly, the inhibition rate on the typhoid bacillus reaches more than 98 percent.

2. The isatis root modified PP master batch prepared by the invention has better pollution resistance; the soil resistance rating is greater than 4 and the soil release rating is greater than 4.

3. The isatis root modified PP master batch prepared by the invention has the water absorption performance of 0.5-0.8%.

4. The isatis root modified PP master batch prepared by the invention has good storage and washing resistance effects; the antibacterial performance can still reach more than 94 percent after the storage for 5 years; after washing for 150 times, the bacteriostasis rate still reaches more than 93 percent.

Detailed Description

The invention is further illustrated below with reference to specific examples.