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Silicon dioxide modified polypropylene antibacterial material and preparation method thereof

An antibacterial material and silicon dioxide technology, applied in the field of silicon dioxide modified polypropylene antibacterial material and its preparation, can solve the problems of intolerance to soaking, heat intolerance, poor compatibility, etc. capacitive effect

Inactive Publication Date: 2020-07-10
卢静
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a preparation method for chemically bonding organic antibacterial agents to PP resins, which overcomes the lack of heat resistance of common organic antibacterial agents, poor compatibility with PP substrates, and resistance to immersion Disadvantages of washing; and the silane coupling agent KH570 surface-modified silica doped with 4-hydroxymethylbenzoic acid is added to the PP resin, so that the PP resin material contains hydrogen-bonded units, which improves the polymer. antimicrobial and biocompatibility

Method used

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  • Silicon dioxide modified polypropylene antibacterial material and preparation method thereof
  • Silicon dioxide modified polypropylene antibacterial material and preparation method thereof
  • Silicon dioxide modified polypropylene antibacterial material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of polypropylene antimicrobial material.

[0027] 4-Hydroxymethylbenzoic acid (5mmol, 0.761g) was dissolved in 20mL of DMF, dichlorosulfite (5mmol, 0.595g) was slowly added dropwise, and reacted at room temperature for 8h to obtain reddish-brown 4-hydroxymethylbenzoyl chloride.

[0028] Add polypropylene (0.50 mmol, 2.70 g) substituted with terminal hydroxyl groups and 20 mL of dioxane into a branched bottle, raise the temperature and keep stirring, and adjust the temperature to 105 ° C after the polypropylene substituted with terminal hydroxyl groups is completely dissolved. Gradually add the above 4-hydroxymethylbenzoyl chloride solution (0.10mmol, 0.085g) dropwise, and after constant temperature reaction for several hours, pour the reaction solution into absolute ethanol to precipitate and filter. After washing several times with absolute ethanol and distilled water several times, use saturated Na 2 CO 3 solution, and finally washed with water until neu...

Embodiment 2

[0030] Preparation of silica-modified polypropylene antibacterial material.

[0031] Place the polypropylene antibacterial material and the silica modified by the silane coupling agent KH570 at 60°C and 100°C for 12 hours, respectively, add 100 parts by weight of the polypropylene antibacterial material to the twin-screw extruder, and silane coupling 5 parts by weight of agent KH570 surface-modified silica, 45 parts by weight of 4-hydroxymethylbenzoic acid, and 0.5 parts by weight of stannous octoate were melt-blended and granulated, the screw speed was 150r / min, and the feed rate was 5kg / h , the temperature is 130-150°C, after granulation and drying, it is foamed in an intermittent foaming device for 12 hours to obtain a silica-modified polypropylene antibacterial material.

Embodiment 3

[0037] Determination of antibacterial effect: Gram-positive bacteria were selected as the object of sterilization for the effect test, and the antibacterial performance was studied by the method of inhibition zone test. Use a meter ruler to measure the size of the inhibition zone around the sample. In order to ensure the accuracy of the data, the width of the inhibition zone of each sample is measured 6 times in different directions at intervals of 60°. The mean value of the zone width, the measured zone size of inhibition. The test results are listed in Table 1.

[0038] Table 1

[0039] project Example 2 Comparative example 1 Comparative example 2 Inhibition zone (mm) 6 18 10

[0040] The results in Table 1 show that the silica-modified polypropylene antibacterial material prepared in Example 2 has a good antibacterial effect, and the polypropylene and organic antibacterial agent 4-hydroxymethylbenzoic acid that do not have antibacterial propert...

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Abstract

The invention discloses a silicon dioxide modified polypropylene antibacterial material and a preparation method thereof. The preparation method comprises the following steps: taking single-terminal hydroxyl polypropylene and 4-hydroxymethyl benzoic acid as reaction raw materials, and adding a silane coupling agent KH570 surface modified silicon dioxide doped with 4-hydroxymethyl benzoic acid prepare a polypropylene material with an antibacterial effect; 4-hydroxymethyl benzoic acid is an organic alcohol antibacterial agent and can cause denaturation, precipitation or solidification of microbial eggs of pathogens; the antibacterial functional group is connected to the PP resin through a chemical bond so that the defects that a common organic antibacterial agent is not resistant to heat, poor in compatibility with a PP matrix and not resistant to soaking and washing can be overcome, and the sterilization effect of the medical mask can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of macromolecule chemical synthesis, and in particular relates to a silicon dioxide modified polypropylene antibacterial material and a preparation method thereof. Background technique [0002] With the development of science and the improvement of human living standards, people's health awareness is constantly strengthening, and the application of antibacterial materials has gradually attracted people's attention. In order to prevent the spread of bacteria, many functional materials with antibacterial and bactericidal properties have emerged. Antibacterial materials can effectively improve people's health and benefit mankind. Existing antibacterial agents are roughly divided into three categories: organic antibacterial agents, inorganic antibacterial agents, and natural antibacterial agents. However, organic antibacterial agents have poor heat resistance and are easily washed off because of their inherent good water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K9/06C08K3/36C08F8/00C08F110/06C08J9/00
CPCC08F8/00C08J9/009C08J2323/12C08K3/36C08K9/06C08F110/06C08L23/12
Inventor 卢静
Owner 卢静
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