阅读说明：本技术 一种膜袋用抗菌淀粉母粒 (Antibacterial starch masterbatch for film bag ) 是由 牛茂平 赵宁 艾雪 徐振龙 刘晓峰 翟士鹏 许跃锋 孙法宇 于 2021-09-22 设计创作，主要内容包括：一种膜袋用抗菌淀粉母粒,包括如下重量份数的物质：淀粉75-85份,硝酸银溶液0.5-5份,增塑剂15-25份,偶联剂0.5-1.5份,加工助剂0.1-0.5份,开口剂0.5-3份,抗氧剂0.1-0.5份。本发明制备的淀粉母粒与其他高分子材料混合后能制备出可降解塑料膜性能优良并兼具抗菌作用,同时本发明制备的淀粉母粒成本较低,便于广泛推广和应用。(The antibacterial starch masterbatch for the film bag comprises the following substances in parts by weight: 75-85 parts of starch, 0.5-5 parts of silver nitrate solution, 15-25 parts of plasticizer, 0.5-1.5 parts of coupling agent, 0.1-0.5 part of processing aid, 0.5-3 parts of opening agent and 0.1-0.5 part of antioxidant. The starch master batch prepared by the invention can be mixed with other high polymer materials to prepare the degradable plastic film with excellent performance and antibacterial function, and meanwhile, the starch master batch prepared by the invention has lower cost and is convenient for wide popularization and application.)

1. The antibacterial starch masterbatch for the film bag is characterized in that: the composition comprises the following substances in parts by weight:

75-85 parts of starch, 0.5-5 parts of silver nitrate solution, 15-25 parts of plasticizer, 0.5-1.5 parts of coupling agent, 0.1-0.5 part of processing aid, 0.5-3 parts of opening agent and 0.1-0.5 part of antioxidant.

2. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the peak is any one or a mixture of more than two of corn starch, cassava starch and potato starch in any proportion.

3. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the purity of the silver nitrate solution is analytically pure.

4. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the plasticizer is any one or a mixture of two of water, glycerol or polyalcohol in any proportion.

5. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the coupling agent is any one of titanate coupling agent or zirconium coupling agent or a mixture of two of the titanate coupling agent and the zirconium coupling agent which are mixed in any proportion.

6. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the processing aid is one or a mixture of two of hydroxyl magnesium type aids or amide type aids mixed in any proportion.

7. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the opening agent is an amide opening agent.

8. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the antioxidant is one or a mixture of more than two of an antioxidant 1010, an antioxidant 168, an antioxidant B215 and an antioxidant 1076 which are mixed in any proportion.

9. The antibacterial starch masterbatch for the film bag according to claim 1, wherein: the preparation method comprises the following steps:

the method comprises the following steps: accurately weighing starch, silver nitrate solution, plasticizer, coupling agent, processing aid, opening agent and antioxidant according to the proportion;

step two: mixing starch and a coupling agent, stirring for 5min at a stirring speed of 25-35Hz, adding a plasticizer, stirring for 10min at a stirring speed of 20-30Hz, adding a silver nitrate solution, stirring for 10min at a stirring speed of 25-35Hz, heating to 105 ℃, stirring for 20min at a stirring speed of 35-50Hz, removing water, adding a processing aid, an opening agent and an antioxidant, stirring for 5min at a stirring speed of 25-35Hz, and uniformly mixing to obtain a mixture for later use;

step three: and D, feeding the mixture obtained in the step two into a double-screw extruder for granulation to obtain the antibacterial starch master batch for the film bag.

10. The antibacterial starch masterbatch for the film bag according to claim 9, wherein: the head temperature of the double-screw extruder is 150 ℃, the temperature of the 1-9 area is 80-150 ℃, the main rotating speed is 300rmp, the feeding rotating speed is 30Hz, the speed of the chain plate conveyor is 30Hz, the granulating rotating speed is 28Hz, and the vacuum is 0.08 MPa.

Technical Field

The invention belongs to the field of preparation of starch master batches, and particularly relates to an antibacterial starch master batch for a film bag.

Background

With the continuous development of society, the living standard of people is continuously improved, the polymer material brings convenience to the daily life of people, and when the living quality is improved, a large amount of waste is increased day by day after the polymer material is used, the polymer material becomes white pollution, seriously harms the environment, causes the pollution of underground water and land, and harms the survival and health of human beings. The biodegradable material can be decomposed under the action of soil microorganisms and enzymes; in 2020, stricter 'forbidden plastic orders' are assigned to provinces in China, and the development of degradation materials is coming to spring. The poor compatibility and high price of the degraded materials are important reasons for restricting the development of the materials.

Disclosure of Invention

The invention provides an antibacterial starch masterbatch for a film bag, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

the antibacterial starch masterbatch for the film bag comprises the following substances in parts by weight:

75-85 parts of starch, 0.5-5 parts of silver nitrate solution, 15-25 parts of plasticizer, 0.5-1.5 parts of coupling agent, 0.1-0.5 part of processing aid, 0.5-3 parts of opening agent and 0.1-0.5 part of antioxidant.

The antibacterial starch masterbatch for the film bag is a mixture of any one or more than two of corn starch, cassava starch and potato starch in any proportion.

The antibacterial starch master batch for the film bag has the purity of analytically pure silver nitrate solution.

The antibacterial starch masterbatch for the film bag is characterized in that the plasticizer is a mixture of water, glycerol or polyalcohol or a mixture of two of the water, the glycerol and the polyalcohol in any proportion.

The antibacterial starch masterbatch for the film bag is characterized in that the coupling agent is a mixture of any one or two of titanate coupling agent or zirconium coupling agent mixed in any proportion.

The antibacterial starch masterbatch for the film bag is a mixture of any one or two of hydroxyl magnesium type auxiliary agents or amide type auxiliary agents mixed in any proportion.

The antibacterial starch masterbatch for the film bag is characterized in that the opening agent is an amide opening agent.

The antibacterial starch masterbatch for the film bag is characterized in that the antioxidant is any one or a mixture of any two or more of antioxidant 1010, antioxidant 168, antioxidant B215 and antioxidant 1076 which are mixed in any proportion.

The preparation method of the antibacterial starch masterbatch for the film bag comprises the following steps:

the method comprises the following steps: accurately weighing starch, silver nitrate solution, plasticizer, coupling agent, processing aid, opening agent and antioxidant according to the proportion;

step two: mixing starch and a coupling agent, stirring for 5min at a stirring speed of 25-35Hz, adding a plasticizer, stirring for 10min at a stirring speed of 20-30Hz, adding a silver nitrate solution, stirring for 10min at a stirring speed of 25-35Hz, heating to 105 ℃, stirring for 20min at a stirring speed of 35-50Hz, removing water, adding a processing aid, an opening agent and an antioxidant, stirring for 5min at a stirring speed of 25-35Hz, and uniformly mixing to obtain a mixture for later use;

step three: and D, feeding the mixture obtained in the step two into a double-screw extruder for granulation to obtain the antibacterial starch master batch for the film bag.

The antibacterial starch masterbatch for the film bag is characterized in that the head temperature of the double-screw extruder is 150 ℃, the temperature of a 1-9 area is 80-150 ℃, the main rotating speed is 300rmp, the feeding rotating speed is 30Hz, the speed of the chain plate conveyor is 30Hz, the granulating rotating speed is 28Hz, and the vacuum is 0.08 MPa.

The invention has the advantages that: the starch master batch prepared by the invention can be mixed with other high polymer materials to prepare the degradable plastic film with excellent performance and antibacterial function, and meanwhile, the starch master batch prepared by the invention has lower cost and is convenient for wide popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a picture of a mixed blow molded film of starch masterbatch and PBAT prepared in example 1 of the present invention;

FIG. 2 is one of the pictures of plastic prepared by mixing and blow molding starch master batch and PBAT prepared in example 1 of the present invention;

fig. 3 is a second picture of plastic prepared by mixing and blow molding the starch masterbatch and the PBAT prepared in example 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The antibacterial starch masterbatch for the film bag comprises the following substances in parts by weight:

75-85 parts of starch, 0.5-5 parts of silver nitrate solution, 15-25 parts of plasticizer, 0.5-1.5 parts of coupling agent, 0.1-0.5 part of processing aid, 0.5-3 parts of opening agent and 0.1-0.5 part of antioxidant.

Preferably, the peak is any one or a mixture of any two or more of corn starch, tapioca starch and potato starch in any proportion.

Preferably, the silver nitrate solution is analytically pure.

Preferably, the plasticizer is any one or a mixture of two of water, glycerin and polyhydric alcohols in any proportion.

Preferably, the coupling agent is a mixture of any one or two of titanate coupling agent or zirconium coupling agent mixed in any proportion.

Preferably, the processing aid is one or a mixture of two of hydroxyl magnesium type aids or amide type aids mixed in any proportion.

Preferably, the opening agent is an amide opening agent.

Preferably, the antioxidant is one or a mixture of any two or more of antioxidant 1010, antioxidant 168, antioxidant B215 and antioxidant 1076 mixed in any proportion.

Preferably, the preparation method comprises the following steps:

the method comprises the following steps: accurately weighing starch, silver nitrate solution, plasticizer, coupling agent, processing aid, opening agent and antioxidant according to the proportion;

step two: mixing starch and a coupling agent, stirring for 5min at a stirring speed of 25-35Hz, adding a plasticizer, stirring for 10min at a stirring speed of 20-30Hz, adding a silver nitrate solution, stirring for 10min at a stirring speed of 25-35Hz, heating to 105 ℃, stirring for 20min at a stirring speed of 35-50Hz, removing water, adding a processing aid, an opening agent and an antioxidant, stirring for 5min at a stirring speed of 25-35Hz, and uniformly mixing to obtain a mixture for later use;

step three: and D, feeding the mixture obtained in the step two into a double-screw extruder for granulation to obtain the antibacterial starch master batch for the film bag.

Preferably, the head temperature of the double-screw extruder is 150 ℃, the temperature of the 1-9 area is 80-150 ℃, the main rotating speed is 300rmp, the feeding rotating speed is 30Hz, the speed of the chain scraper conveyor is 30Hz, the granulating rotating speed is 28Hz, and the vacuum is 0.08 MPa.

Example 1

Weighing the following materials by mass: 75 parts of starch, 1 part of silver nitrate solution, 21.5 parts of plasticizer, 0.5 part of coupling agent, 0.3 part of processing aid, 1.5 parts of opening agent and 0.2 part of antioxidant. And (3) obtaining the antibacterial starch masterbatch for the film bag according to the mixing and processing technology. 60% PBAT + 40% of the starch master batch is blown to film to test the mechanical property, the specific gravity and the antibacterial property.

Example 2

Weighing the following materials by mass: 77 parts of starch, 2 parts of silver nitrate solution, 18.5 parts of plasticizer, 0.5 part of coupling agent, 0.3 part of processing aid, 1.5 parts of opening agent and 0.2 part of antioxidant. And (3) obtaining the antibacterial starch masterbatch for the film bag according to the mixing and processing technology. 60% PBAT + 40% of the starch master batch is blown to film to test the mechanical property, the specific gravity and the antibacterial property.

Comparative example

And testing the mechanical property, the specific gravity and the antibacterial property of the pure PBAT blown film.

The starch master batch 40% + PBAT 60% obtained in example 1-2 was blown into a film, and the film was tested together with the comparative example blown film, and the test results are shown in Table I.

Watch 1

As can be seen from table one, after 40% of the starch master batches prepared in examples 1 and 2 are added, the tensile strength and the elongation at break of the film are both increased, and the heat sealing strength is increased, and after the silver nitrate solution is added into the material after being processed, the antibacterial rate and the antifungal grade of the film both meet the requirements of the antibacterial material, and the price of the starch master batches is lower than that of PBAT, so that the product performance can be effectively improved while the cost is reduced, and the wide popularization and use are facilitated.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.