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Antiviral polylactic acid melt-blown material and preparation method and application thereof

A polylactic acid, antiviral technology, applied in the application, textile and papermaking, one-component polyester rayon, etc., can solve the problems of limited development and application, irritation, brittleness, etc., to achieve a good wearing experience and ensure uniformity , the effect of uniform flexibility

Active Publication Date: 2021-07-09
CHENGDU MEDART MEDICAL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the defects of the polylactic acid melt-blown material itself, especially the mechanical brittleness, its development and application are limited.
Domestic patents CN101168617A, CN102504507A and CN103726220A disclose flexible melt-blown nonwoven fabrics prepared by adding plasticizers such as copolyester and polyester polyols to polylactic acid. However, these toughening methods cannot ensure the uniformity of the properties of melt-blown cloth materials.
In addition, the polylactic acid material itself does not have the ability to kill viruses. It is necessary to add various disinfectants to the polylactic acid melt-blown cloth base material to kill viruses. However, these disinfectants themselves have certain irritation and damage to human skin and mucous membranes. , will bring a bad wearing experience to the final mask user

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Effect test

preparation example Construction

[0028] The present invention provides a kind of antiviral polylactic acid melt-blown material, and its preparation method comprises the following steps:

[0029] S1. Stir and mix lactic acid, polyol and water in proportion to obtain a homogeneous solution;

[0030] S2. Heating the homogeneous solution to 60-80°C to remove moisture, then raising the temperature to 100-120°C, and reacting for 2-4 hours to obtain modified lactic acid containing flexible monomers;

[0031] S3, stirring and mixing the modified lactic acid and the catalyst in proportion, at a temperature of 130-150° C., vacuum insulation for 12-15 hours, to obtain modified polylactic acid; wherein, the degree of vacuum is 0.085-0.1 MPa;

[0032] S4. Mix the modified polylactic acid, the alkali metal periodate and the compatibilizer (the amount of the compatibilizer added is 60-90 parts by weight), and then place it at room temperature to react in the dark for 2-5 hours to obtain polylactic acid Crude;

[0033] S5....

Embodiment 1

[0039] A kind of antiviral polylactic acid melt-blown material, its preparation method comprises the following steps:

[0040] S1. Add L-lactic acid, ethylene glycol and purified water into the three-necked flask at a weight ratio of 6:4:60, stir to dissolve, and form a uniform solution;

[0041] S2. Raise the temperature of the homogeneous solution to 80°C, remove the moisture, then raise the temperature to 100°C and keep it warm for 2 hours, and obtain the modified lactic acid containing flexible monomers through the dehydration condensation between the hydroxyl groups on the lactic acid and the hydroxyl groups of polyols;

[0042] S3. According to the weight ratio of modified lactic acid and stannous chloride of 1000:1, stannous chloride was added, and the temperature was 135°C and the degree of vacuum was 0.085MPa, and the reaction was kept for 12 hours to obtain modified polylactic acid;

[0043] S4. Mix the modified polylactic acid and potassium periodate in a ratio of 1...

Embodiment 2

[0048] A kind of antiviral polylactic acid melt-blown material, its preparation method comprises the following steps:

[0049] S1. Add L-lactic acid, glycerol and purified water into the three-necked flask at a weight ratio of 9:4:60, stir to dissolve, and form a uniform solution;

[0050] S2. Raise the temperature of the homogeneous solution to 80°C, remove the moisture, then raise the temperature to 100°C and keep it warm for 2 hours, and obtain the modified lactic acid containing flexible monomers through the dehydration condensation between the hydroxyl groups on the lactic acid and the hydroxyl groups of polyols;

[0051] S3. According to the weight ratio of modified lactic acid and stannous chloride of 900:1, stannous chloride was added, and the temperature was 130° C. and the vacuum degree was 0.09 MPa, and the reaction was kept for 12 hours to obtain modified polylactic acid;

[0052] S4. Mix the modified polylactic acid and potassium periodate in a ratio of 11:1 by we...

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Abstract

The invention discloses an antiviral polylactic acid melt-blown material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, stirring and mixing lactic acid, polyol and water to obtain a uniform solution; s2, carrying out heating reaction to obtain modified lactic acid; s3, mixing the modified polylactic acid with a catalyst to obtain modified polylactic acid; s4, uniformly mixing the modified polylactic acid, alkali metal periodate and a compatilizer, and reacting in a dark place to obtain a polylactic acid crude product; s5, adding absolute ethyl alcohol, and then quickly stirring to precipitate a polylactic acid semi-finished product; s6, filtering the polylactic acid semi-finished product with a filter membrane and drying; and S7, drying, and carrying out jet milling. The degradable polylactic acid melt-blown material containing the terminal aldehyde group and capable of killing the viruses is uniform in flexibility, can play a role in killing the viruses, is used for manufacturing protective masks, can solve the problem of degradability of the existing masks, and can provide sufficient bacteria and virus protection and good wearing feeling for a wearer.

Description

technical field [0001] The invention relates to the technical field of degradable masks, in particular to an antiviral polylactic acid melt-blown material and its preparation method and application. Background technique [0002] The protective effect of the protective masks developed in my country against bacteria and phages can reach more than 99%, and the filtration efficiency can meet the requirements of N95 protective masks ≥ 95%. However, with the surge in demand for medical protective masks, the current domestic production capacity of masks Reaching more than 110 million per day, these masks are basically discarded after one-time use. At the same time, the main part of the mask is the melt-blown cloth layer in the middle that acts as a filter. At present, the most widely used is polypropylene melt-blown cloth. Polypropylene material can only filter one of oily particles or non-oily particles, and can inhibit a certain number of bacteria, but cannot inhibit viruses. Mo...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/78D01F6/62A41D13/11A41D31/30
CPCC08G63/08C08G63/78D01F6/625A41D13/11A41D31/30C08G2230/00
Inventor 杨满张晓金王军
Owner CHENGDU MEDART MEDICAL SCI CO LTD
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