阅读说明：本技术 一种可降解包装袋 (Degradable packaging bag ) 是由 余云洋 张燕 朱燕 周采军 丁浩 于 2020-07-22 设计创作，主要内容包括：本发明提供一种可降解包装袋,具体涉及包装领域,由以下质量份数的物质组成,10至30份聚氨酯、1至15份交联剂、5至15份助溶剂、植物纤维30至50份,高岭土1至8份,聚乙烯醇1至6份,玉米淀粉10至20份。本发明可提高降解效率,大大减少了对环境的影响。(The invention provides a degradable packaging bag, and particularly relates to the field of packaging, which comprises, by mass, 10-30 parts of polyurethane, 1-15 parts of a cross-linking agent, 5-15 parts of a cosolvent, 30-50 parts of plant fibers, 1-8 parts of kaolin, 1-6 parts of polyvinyl alcohol, and 10-20 parts of corn starch. The invention can improve the degradation efficiency and greatly reduce the influence on the environment.)

1. A degradable packaging bag is characterized in that: the polyurethane foaming agent is composed of, by mass, 10-30 parts of polyurethane, 1-15 parts of a cross-linking agent, 5-15 parts of a cosolvent, 30-50 parts of plant fibers, 1-8 parts of kaolin, 1-6 parts of polyvinyl alcohol and 10-20 parts of corn starch.

2. The degradable packaging bag of claim 1, wherein: the polyurethane foaming adhesive comprises, by mass, 15-25 parts of polyurethane, 1-10 parts of a cross-linking agent, 5-10 parts of a cosolvent, 35-45 parts of plant fibers, 1-5 parts of kaolin, 1-4 parts of polyvinyl alcohol and 15-20 parts of corn starch.

3. The degradable packaging bag of claim 2, wherein: the polyurethane adhesive comprises, by mass, 20 parts of polyurethane, 5 parts of a cross-linking agent, 6 parts of a cosolvent, 40 parts of plant fibers, 2 parts of kaolin, 3 parts of polyvinyl alcohol and 18 parts of corn starch.

4. The degradable packaging bag of claim 3, wherein: the cross-linking agent is dicumyl peroxide or benzoyl peroxide or di-tert-butyl peroxide or dicumyl peroxide or diethylenetriamine or bis-25; the cosolvent is self-spitting temperature 60 or span 80 or span 60.

5. The method for preparing the degradable packaging bag according to claim 4, wherein the degradable packaging bag comprises the following steps: the method comprises the following specific steps:

s1, pulping the plant fibers according to the proportion, wherein the pulping degree is 40-50 degrees SR;

s2, placing the polyethylene, the corn starch and the substance obtained in the step S1 into a stirrer, and stirring for 8 minutes at the stirring speed of 6000 rpm to 7000 rpm;

after the stirring in the steps S3 and S2 is finished, adding 3 parts of polyurethane, a cross-linking agent, a cosolvent, kaolin and polyvinyl alcohol, and stirring for 10-15 minutes at the stirring speed of 300-500 rpm;

s4, conveying the step S3 into a blow molding machine, drying through three segments of air boxes, wherein the temperature of the three segments of air boxes is 55 ℃, 70 ℃ and 85 ℃ in sequence, the heating time of each air box is 10 minutes, and then extruding and blow molding to form a film with the thickness of 0.1 mm; and cutting to obtain the finished product.

Technical Field

The invention belongs to the field of packaging, and particularly relates to a degradable packaging bag.

Background

The packaging bag is an indispensable part for life and production, the packaging bag is convenient for people's life, but also brings great pressure to the environment, and the packaging bag made of non-environment-friendly materials is completely degraded for years, even decades, which seriously deviates from the sustainable development view; therefore, the degradable packaging bag becomes an important development trend of the packaging bag; the degradable packaging bag can be used for naturally decomposing organic garbage, and biochemical reaction is carried out under the action of microorganisms (bacteria, mould and algae), so that the appearance is mildewed to change in all aspects such as internal quality change and the like, and compounds with common forms in nature, such as carbon dioxide, water and the like, are finally formed. The garbage can be degraded, and the influence on the environment is greatly reduced. However, the environmental protection and the degradability of the existing degradable packaging bag are still to be further improved;

in view of the above disadvantages, there is a need for a degradable packaging bag, which can improve the degradation efficiency and greatly reduce the influence on the environment.

Disclosure of Invention

The invention aims to provide a degradable packaging bag, which can improve the degradation efficiency and greatly reduce the influence on the environment.

The invention provides the following technical scheme:

a degradable packaging bag comprises, by mass, 10-30 parts of polyurethane, 1-15 parts of a cross-linking agent, 5-15 parts of a cosolvent, 30-50 parts of plant fibers, 1-8 parts of kaolin, 1-6 parts of polyvinyl alcohol and 10-20 parts of corn starch.

Preferably, the polyurethane adhesive comprises, by mass, 15-25 parts of polyurethane, 1-10 parts of a cross-linking agent, 5-10 parts of a cosolvent, 35-45 parts of plant fibers, 1-5 parts of kaolin, 1-4 parts of polyvinyl alcohol and 15-20 parts of corn starch.

Preferably, the polyurethane adhesive comprises, by mass, 20 parts of polyurethane, 5 parts of a cross-linking agent, 6 parts of a cosolvent, 40 parts of plant fibers, 2 parts of kaolin, 3 parts of polyvinyl alcohol and 18 parts of corn starch.

Preferably, the cross-linking agent is dicumyl peroxide or benzoyl peroxide or di-tert-butyl peroxide or dicumyl peroxide or diethylenetriamine or bis 25; the cosolvent is self-spitting temperature 60 or span 80 or span 60.

A preparation method of a degradable packaging bag is characterized by comprising the following steps: the method comprises the following specific steps:

s1, pulping the plant fibers according to the proportion, wherein the pulping degree is 40-50 degrees SR;

s2, placing the polyethylene, the corn starch and the substance obtained in the step S1 into a stirrer, and stirring for 8 minutes at the stirring speed of 6000 rpm to 7000 rpm;

after the stirring in the steps S3 and S2 is finished, adding 3 parts of polyurethane, a cross-linking agent, a cosolvent, kaolin and polyvinyl alcohol, and stirring for 10-15 minutes at the stirring speed of 300-500 rpm;

s4, conveying the step S3 into a blow molding machine, drying through three segments of air boxes, wherein the temperature of the three segments of air boxes is 55 ℃, 70 ℃ and 85 ℃ in sequence, the heating time of each air box is 10 minutes, and then extruding and blow molding to form a film with the thickness of 0.1 mm; and cutting to obtain the finished product.

The invention has the beneficial effects that:

the invention can improve the degradation efficiency and greatly reduce the influence on the environment; the degradable packaging bag has good moisture-proof and insect-proof effects, can be naturally and rapidly degraded within one year and decomposed into carbon dioxide and water, and greatly reduces the pollution to the environment.

Detailed Description