CN112280155A

CN112280155A - Antibacterial plastic packaging bag composite material and preparation method thereof

Info

Publication number: CN112280155A
Application number: CN202011341103.6A
Authority: CN
Inventors: 姜世文
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-01-29

Abstract

The invention discloses an antibacterial plastic packaging bag composite material which is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 30-50 parts of LDPE, 10-20 parts of LLDPE, 5-10 parts of plasticizer, 3-5 parts of coupling agent, 1-3 parts of antioxidant and 1-3 parts of bacteriostatic agent, wherein the plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate; the coupling agent is a mixture of vinyl methyl dimethoxy silane and isopropyl triisostearate; the antioxidant is a mixture of antioxidant 1076 and antioxidant 1024; the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate. The polymer system of the antibacterial plastic packaging bag composite material has excellent compatibility and stability, and the prepared plastic packaging bag material has high tensile strength and excellent antibacterial effect.

Description

Antibacterial plastic packaging bag composite material and preparation method thereof

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to an antibacterial plastic packaging bag composite material and a preparation method thereof.

Background

The plastic packaging bag is a packaging bag which takes plastic as a raw material and is used for producing various articles in daily life, and plays an important role in daily life of people and industrial and agricultural production. The common plastic packaging bag is mostly made of polyethylene film, and the film is nontoxic, so the plastic packaging bag can be used for containing food. With the gradual improvement of the living standard of people, higher requirements are put forward on the aspects of food safety, freshness, taste and the like. The packaging bag is an essential article in the food storage and transportation process, has important influence on the freshness of food in the transportation process and whether bacterial infection exists, and the safety performance of the packaging bag is also a crucial aspect. The existing food packaging bags in the market can be trusted in safety performance, but the antibacterial and fresh-keeping performance can not meet the use requirements.

Because the antibacterial plastic can fundamentally reduce or avoid the cross infection of bacteria among people, people and objects and between objects, the plastic products with the antibacterial function are generally regarded and welcomed by people. In order to effectively prevent and kill bacteria attached to the surface of plastic, antibacterial plastic is usually prepared by adding an antibacterial agent into plastic, so that the plastic has antibacterial property, and can kill or inhibit the bacteria stained on the plastic within a certain period of time. The development and application of the antibacterial plastic play a green barrier for protecting human health trees, and have very important significance for improving human living environment, reducing diseases and protecting the health of the whole people.

Currently, a large number of antibacterial agents are used in plastic products, and depending on the application environment of the antibacterial agent in the plastic products and the specific spectrum effect of the antibacterial agent, a plurality of antibacterial agents are generally selected to make the products have a wide range of antibacterial properties. However, most of the antibacterial agents have poor compatibility with plastics, or obvious bacteriostasis and sterilization effects can be achieved only by adding the antibacterial agents with higher concentration, and the factors can cause the overall performance of the plastic products to be reduced, thereby limiting the application range. Therefore, when different types of antibacterial agents are added to plastic products, attention is paid to dispersibility in plastics and compatibility with plastics when different antibacterial agents are used in combination.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an antibacterial plastic packaging bag composite material and a preparation method thereof. In order to realize the purpose, the invention adopts the following technical scheme:

the antibacterial plastic packaging bag composite material is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 30-50 parts of LDPE, 10-20 parts of LLDPE, 5-10 parts of plasticizer, 3-5 parts of coupling agent, 1-3 parts of antioxidant and 1-3 parts of bacteriostatic agent.

The plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate, and preferably, the mass ratio of the dioctyl adipate to the dicyclohexyl phthalate is 1: 3-5;

the coupling agent is a mixture of vinyl methyl dimethoxy silane and isopropyl triisostearate, preferably, the mass ratio of the two is 1: 1-3;

the antioxidant is a mixture of an antioxidant 1076 and an antioxidant 1024, and preferably, the mass ratio of the antioxidant to the antioxidant is 1: 1-3;

the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, preferably, the mass ratio of the two is 3-5: 1.

the preparation method of the antibacterial plastic packaging bag composite material comprises the following steps:

(1) putting HDPE, LDPE and LLDPE into a mixer according to the proportion, fully mixing, adding plasticizer, coupling agent, antioxidant and bacteriostatic agent, and fully mixing to obtain a mixture;

(2) and granulating the mixture at the temperature of 170-200 ℃ by adopting a parallel double-screw extruder, wherein the rotating speed of the screws is 800r/min, and drying at the temperature of 80-100 ℃ to obtain the antibacterial plastic packaging bag composite material.

According to the invention, through research, in a plastic packaging bag system taking HDPE, LDPE and LLDPE as main materials, a mixture of dioctyl adipate and dicyclohexyl phthalate in a specific ratio is compounded as a plasticizer, a mixture of vinylmethyldimethoxysilane and isopropyl triisostearate in a specific ratio is used as a coupling agent, a mixture of antioxidant 1076 and antioxidant 1024 in a specific ratio is used as an antioxidant, and a mixture of 8-hydroxyquinolinone and tributyltin acetate in a specific ratio is used as an antibacterial agent, so that the polymer system has excellent compatibility and stability, and the prepared plastic packaging bag material has high tensile strength and excellent antibacterial effect.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to illustrate further features and advantages of the invention, and not to limit the scope of the claims.

In all examples and comparative examples, HDPE was made of Zhonghai Shell 5121B high density polyethylene, LDPE was made of Shanghai petrochemical N210 low density polyethylene, and LLDPE was made of Zhonghai synthetic EGF-35B linear low density polyethylene.

Example 1:

the antibacterial plastic packaging bag composite material is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 45 parts of LDPE, 10 parts of LLDPE, 8 parts of plasticizer, 5 parts of coupling agent, 3 parts of antioxidant and 3 parts of bacteriostatic agent;

the plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate, and the mass ratio of the dioctyl adipate to the dicyclohexyl phthalate is 1: 3;

the coupling agent is a mixture of vinyl methyl dimethoxysilane and isopropyl triisostearate, and the mass ratio of the vinyl methyl dimethoxysilane to the isopropyl triisostearate is 1: 1;

the antioxidant is a mixture of antioxidant 1076 and antioxidant 1024, and the mass ratio of the antioxidant to the antioxidant is 1: 2;

the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, and the mass ratio of the two is 3: 1.

(2) and granulating the mixture at 190 ℃ by adopting a parallel double-screw extruder, drying the mixture at 90 ℃ at the screw rotation speed of 500r/min to obtain the antibacterial plastic packaging bag composite material.

Example 2:

the antibacterial plastic packaging bag composite material is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 30 parts of LDPE, 20 parts of LLDPE, 5 parts of plasticizer, 3 parts of coupling agent, 1 part of antioxidant and 3 parts of bacteriostatic agent.

The plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate, and the mass ratio of the dioctyl adipate to the dicyclohexyl phthalate is 1: 5;

the coupling agent is a mixture of vinyl methyl dimethoxysilane and isopropyl triisostearate, and the mass ratio of the vinyl methyl dimethoxysilane to the isopropyl triisostearate is 1: 3;

the antioxidant is a mixture of an antioxidant 1076 and an antioxidant 1024, and preferably, the mass ratio of the antioxidant to the antioxidant is 1: 1;

the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, and the mass ratio of the two is 5: 1.

the preparation method of the antibacterial plastic packaging bag composite material is the same as that in example 1.

Example 3:

the antibacterial plastic packaging bag composite material is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 50 parts of LDPE, 15 parts of LLDPE, 10 parts of plasticizer, 5 parts of coupling agent, 3 parts of antioxidant and 2 parts of bacteriostatic agent.

The plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate, and the mass ratio of the dioctyl adipate to the dicyclohexyl phthalate is 1: 4;

the coupling agent is a mixture of vinyl methyl dimethoxysilane and isopropyl triisostearate, and the mass ratio of the vinyl methyl dimethoxysilane to the isopropyl triisostearate is 1: 2;

the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, and the mass ratio of the two is 4: 1.

Comparative example 1:

comparative example 1 differs from example 1 in that the bacteriostatic agent is 8-hydroxyquinolinone.

Comparative example 2:

comparative example 2 differs from example 1 in that the bacteriostatic agent is tributyltin acetate.

Comparative example 3:

the difference between the comparative example 3 and the example 1 is that the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin chloride, and the mass ratio of the two is 3: 1.

comparative example 4:

comparative example 4 is different from example 1 in that the bacteriostatic agent is a mixture of isothiazolinone and tributyltin acetate, and the mass ratio of isothiazolinone to tributyltin acetate is 3: 1.

comparative example 5:

the difference between the comparative example 5 and the example 1 is that the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, and the mass ratio of the two is 1: 1.

comparative example 6:

comparative example 6 differs from example 1 in that the plasticizer is dioctyl adipate, the coupling agent is vinylmethyldimethoxysilane, and the antioxidant is antioxidant 1076.

Comparative example 7:

comparative example 7 differs from example 1 in that the plasticizer is dicyclohexyl phthalate, the coupling agent is isopropyl triisostearate, and the antioxidant is antioxidant 1024.

Comparative example 8:

comparative example 8 differs from example 1 in that the plasticizer is a mixture of diisobutyl azelate and dicyclohexyl phthalate in a mass ratio of 1: 3;

comparative example 9:

comparative example 9 differs from example 1 in that the plasticizer is a mixture of dioctyl adipate and diisobutyl phthalate in a mass ratio of 1: 3;

comparative example 10:

comparative example 10 differs from example 1 in that the coupling agent is a mixture of methyltriacetoxysilane and isopropyl triisostearate in a mass ratio of 1: 1;

comparative example 11:

comparative example 11 differs from example 1 in that the coupling agent is a mixture of vinylmethyldimethoxysilane and triethanolamine isopropyl titanate in a mass ratio of 1: 1;

comparative example 12:

comparative example 12 differs from example 1 in that the antioxidant is antioxidant 1010.

The performance comparison tests of the antibacterial plastic packaging bag composite materials prepared in the examples 1-3 and the comparative examples 1-12 of the invention are as follows:

firstly, the tensile strength test refers to ASTM D638-: (175. + -. 2) × (12.5. + -. 0.2) × (3.0. + -. 0.2), and the drawing speed was 50 mm/min.

And secondly, the antibacterial performance test refers to QB/T2591-2003 'antibacterial plastic-antibacterial performance test method and antibacterial effect', the bacteriostasis rate of the sample is inspected for 24h by adopting a film sticking method, and the total number of the bacterial colonies is counted according to GB/T4789.2-2003 'determination of total number of bacterial colonies for food hygiene microbiological inspection'. The injection molded antimicrobial panels were made 50mm by 50 mm. The calculation formula of the antibacterial rate is as follows:

R（%）=(B-C)/B×100

in the formula: r-antibacterial rate,%;

b-average recovery bacteria number of blank control sample, cfu/piece;

c-average recovery bacteria number of the antibacterial plastic sample, cfu/piece.

The test results are shown in Table 1.

TABLE 1

From the test results in table 1, it can be concluded that the antibacterial plastic packaging bag composite materials of examples 1-3 of the present invention all have very excellent tensile strength and antibacterial performance, wherein example 1 is the most preferred technical solution of the present invention. Meanwhile, through the performance influence caused by the component difference in the antibacterial agents of the comparative examples 1-5 and the example 1, the antibacterial plastic packaging bag composite material disclosed by the invention can be used for synergistically improving the antibacterial performance and greatly reducing the influence on the tensile strength by selecting the mixture of 8-hydroxyquinolinone and tributyltin acetate in a specific ratio. Through the influence of different degrees on the tensile strength and the antibacterial performance caused by different specific types of the plasticizers, the coupling agents and the antioxidants selected in comparative examples 6 to 12 and example 1, the antibacterial plastic packaging bag composite material is a whole with the synergistic effect of all the components, and the high tensile strength and the excellent antibacterial performance of the antibacterial plastic packaging bag composite material can be achieved by replacing other conventional types of plasticizers, coupling agents and antioxidants.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be within the technical scope of the present invention.

Claims

1. The antibacterial plastic packaging bag composite material is prepared from the following raw materials in parts by weight: 100 parts of HDPE, 30-50 parts of LDPE, 10-20 parts of LLDPE, 5-10 parts of plasticizer, 3-5 parts of coupling agent, 1-3 parts of antioxidant and 1-3 parts of bacteriostatic agent, and is characterized in that the plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate; the coupling agent is a mixture of vinyl methyl dimethoxy silane and isopropyl triisostearate; the antioxidant is a mixture of antioxidant 1076 and antioxidant 1024; the bacteriostatic agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate.

2. An antibacterial plastic packaging bag composite material as claimed in claim 1, wherein the plasticizer is a mixture of dioctyl adipate and dicyclohexyl phthalate, and the mass ratio of the dioctyl adipate to the dicyclohexyl phthalate is 1: 3-5.

3. The antibacterial plastic packaging bag composite material as claimed in claim 1, wherein the coupling agent is a mixture of vinylmethyldimethoxysilane and isopropyl triisostearate, and the mass ratio of the vinylmethyldimethoxysilane to the isopropyl triisostearate is 1: 1-3.

4. The antibacterial plastic packaging bag composite material as claimed in claim 1, wherein the antioxidant is a mixture of an antioxidant 1076 and an antioxidant 1024, and the mass ratio of the antioxidant 1076 to the antioxidant 1024 is 1: 1-3.

5. The antibacterial plastic packaging bag composite material as claimed in claim 1, wherein the antibacterial agent is a mixture of 8-hydroxyquinolinone and tributyltin acetate, and the mass ratio of the two is 3-5: 1.

6. the preparation method of the antibacterial plastic packaging bag composite material according to any one of claims 1 to 5, comprising the following steps: