阅读说明：本技术 一种易降解型泡沫包装材料制备方法 (Preparation method of easily degradable foam packaging material ) 是由 张景亮 张景期 王佳林 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种易降解型泡沫包装材料制备方法,涉及泡沫材料生产技术领域,步骤一：将适量的淀粉、聚丙烯、对-甲苯酰磺氨基脲、苯甲酸钠、2、5-二甲基-2、5-二叔丁基过氧已烷或过氧化二异丙苯、脂肪酸甘油酯、异戊烷按照配比份数盛于混合机中,搅拌混合均匀；步骤二：将混合料送进带T型机头和料筒上具有制剂注入口的螺旋挤出机中。本发明通过在混合中加入适量的淀粉,淀粉与聚丙烯等材料进行混合,混合后再注入异戊烷或二氧化碳,使混合料易于发泡,由于淀粉的添加,淀粉容易被生物降解,导致含有淀粉的混合物在制成泡沫材料后的产品,也容易降解,解决了聚丙烯降解速度慢、降解难度大的问题。(The invention discloses a preparation method of an easily degradable foam packaging material, which relates to the technical field of foam material production and comprises the following steps: proper amount of starch, polypropylene, p-toluoyl sulfamide, sodium benzoate, 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane or dicumyl peroxide, fatty glyceride and isopentane are put into a mixer according to the proportion parts and are stirred and mixed evenly; step two: the blend was fed into a screw extruder with a T-head and a barrel with a preparation injection port. The invention adds proper amount of starch in the mixture, the starch is mixed with polypropylene and other materials, isopentane or carbon dioxide is injected after the mixture is mixed, so that the mixture is easy to foam, the starch is easy to be biodegraded due to the addition of the starch, the product of the mixture containing the starch after being made into the foam material is also easy to degrade, and the problems of low degradation speed and high degradation difficulty of the polypropylene are solved.)

1. A preparation method of an easily degradable foam packaging material is characterized by comprising the following steps: comprises the following steps:

the method comprises the following steps: proper amount of starch, polypropylene, p-toluoyl sulfamide, sodium benzoate, 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane or dicumyl peroxide, fatty glyceride and isopentane are put into a mixer according to the proportion parts and are stirred and mixed evenly;

step two: feeding the mixture into a screw extruder with a T-shaped head and a preparation injection opening on a charging barrel;

step three: heating the mixture in the charging barrel at different stages;

step four: heating the mixture, extruding, and simultaneously quantitatively injecting isopentane or carbon dioxide from a preparation injection port according to the mixture ratio;

step five: conveying the extruded sheet foam blank to a conveyor with a plurality of pairs of compression rollers for compression roller molding;

step six: cooling the shaped foam to obtain a sheet foam finished product;

step seven: and (4) feeding the sheet foam finished product into a plastic sucking machine to be made into various packaged products.

2. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: in order to enable the mixture melt of the starch and the polypropylene to be foamed, a nucleating agent sodium benzoate, a cross-linking agent 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane, a surface active and coupling agent fatty glyceride and two foaming agents are used in the formula.

3. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: the p-toluoyl semicarbazide is a chemical foaming agent, and isopentane or carbon dioxide is a physical foaming agent.

4. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: the sodium benzoate, the 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane and the fatty glyceride can increase the viscosity and the strength of the mixture melt, so that the mixture melt is easy to foam.

5. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: the starch can be biodegraded, and the polypropylene can be rapidly degraded by light, heat and oxygen.

6. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: the biodegradable and naturally differentiable component accounts for about 50% of the total component, and when the biodegradable and naturally differentiable component is degraded and differentiated, the polypropylene in the material can be crushed into powder.

7. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: due to the combination of the starch and the polypropylene, the packaging material has the functions of biodegradation and rapid photo-thermal and oxygen degradation.

8. The method for preparing the easily degradable foam packaging material according to claim 1, wherein the method comprises the following steps: and the finished product of the flaky foam packaging material is overlapped and bonded to reach the thickness required by the industrial product packaging material, and then the finished product is cut according to the packaging shape required by the industrial product to prepare the packaging product.

Technical Field

The invention relates to the technical field of foam packaging material production, in particular to a preparation method of an easily degradable foam packaging material.

Background

In order to eliminate the white pollution caused by the polystyrene foam packaging material, a part of the packaging material is changed into the polyethylene foam packaging material, the ethylene foam plastic is made of polyethylene resin as a main body and is added with a foaming agent, a cross-linking agent and other additives, and is an important buffer material with low density which can reach 0.01/cm3 at least; the cushioning property, the heat resistance and the water absorption are small; the chemical property is stable and is not easy to corrode; the mechanical property is good, and the material is tough, flexible and friction-resistant; the processing performance is good, and the molding is easy; the method for preparing the foam material has the advantages that the price is low, the degradation generally means that the number of carbon atoms in organic compound molecules is reduced, the molecular weight is reduced, different students hold different viewpoints for degradation, one viewpoint is that degradation products are finally decomposed into carbon dioxide and water to be called degradation polymerization, photochemical degradation means that under the action of external factors such as heat, light, mechanical force, chemical reagents and microorganisms, the polymer is subjected to random breakage of molecular chains and elimination reaction of side groups and low molecules, so that the polymerization degree and the relative molecular weight are reduced, the ethylene foam plastic can be degraded after being exposed to the sun (under the action of light, heat and oxygen), and the preparation method of the foam material comprises material mixing, mixture extrusion, solvent adding, roll forming and cooling forming.

However, the degradation speed of polyethylene is slow, polyethylene cannot be buried deeply underground, and polyethylene can only be exposed to the sun, so that a large amount of ground surface is occupied for exposure degradation, the degradation difficulty is caused, the viscosity and the strength of the molten polyethylene are low, the foaming process is not easy to control, and the preparation of the foam packaging material is influenced.

Disclosure of Invention

The invention aims to: in order to solve the problems of low degradation speed and high degradation difficulty of polyethylene and difficulty in controlling the foaming process of polyethylene, a preparation method of an easily degradable foam packaging material is provided.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of an easily degradable foam packaging material comprises the following steps:

the method comprises the following steps: proper amount of starch, polypropylene, p-toluoyl sulfamide, sodium benzoate, 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane or dicumyl peroxide, fatty glyceride and isopentane are put into a mixer according to the proportion parts and are stirred and mixed evenly;

step two: feeding the mixture into a screw extruder with a T-shaped head and a preparation injection opening on a charging barrel;

step three: heating the mixture in the charging barrel at different stages;

step four: heating the mixture, extruding, and simultaneously quantitatively injecting isopentane or carbon dioxide from a preparation injection port according to the mixture ratio;

step five: conveying the extruded sheet foam blank to a conveyor with a plurality of pairs of compression rollers for compression roller molding;

step six: cooling the shaped foam to obtain a sheet foam finished product;

step seven: and (4) feeding the sheet foam finished product into a plastic sucking machine to be made into various packaged products.

Preferably, in order to make the melt of the mixture of starch and polypropylene foamable, a nucleating agent "sodium benzoate", a cross-linking agent "2, 5-dimethyl-2, 5-di-tert-butylperoxyhexane", a surface-active and coupling agent "fatty acid glyceride" and two foaming agents are used in the formulation.

Preferably, the p-toluoyl semicarbazide is a chemical blowing agent and isopentane or carbon dioxide is a physical blowing agent.

Preferably, the sodium benzoate, the 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane and the fatty glyceride can increase the viscosity and strength of the mixture melt, so that the mixture melt is easy to foam.

Preferably, the starch is biodegradable and the polypropylene is rapidly degraded by light, heat or oxygen.

Preferably, the biodegradable and naturally differentiable component comprises about 50% of the total composition, and the polypropylene in the material is pulverized after the biodegradable and naturally differentiable component is degraded and differentiated.

Preferably, the combination of the starch and the polypropylene enables the packaging material to have the functions of biodegradation and rapid light, heat and oxygen degradation.

Preferably, the finished sheet-shaped foam packaging material is overlapped and bonded to reach the thickness required by the industrial product packaging material, and then the finished product is cut according to the packaging shape required by the industrial product to form the packaging product.

Compared with the prior art, the invention has the beneficial effects that: the invention adds proper amount of starch in the mixture, the starch is mixed with polypropylene and other materials, isopentane or carbon dioxide is injected after the mixture is mixed, the mixture is easy to foam, the starch is easy to be biodegraded due to the addition of the starch, so that the product of the mixture containing the starch after being made into the foam material is also easy to degrade, the problems of low degradation speed and high degradation difficulty of the polypropylene are solved, the sodium benzoate can be used as a plasticizer in the plastic industry by using a nucleating agent sodium benzoate, a cross-linking agent 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane, a surface active and coupling agent fatty glyceride and two foaming agents in the formula, the strength of the foam material is increased, the fatty glyceride is slightly acidic, the viscosity of the foam material is increased, the mixture melt is easy to foam, and the foaming rate is increased, the foaming agent has higher surface activity, can effectively reduce the surface tension of liquid, is arranged on the surface of a liquid film by two electronic layers to surround air to form bubbles, and then the bubbles form foam, so that the problem that the foaming process of polyethylene is difficult to control is effectively solved.

Drawings

FIG. 1 is a schematic flow chart of the method of the present invention.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1, a method for preparing a degradable foam packaging material includes the following steps:

the method comprises the following steps: proper amount of starch, polypropylene, p-toluoyl sulfamide, sodium benzoate, 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane or dicumyl peroxide, fatty glyceride and isopentane are put into a mixer according to the proportion parts and are stirred and mixed evenly;

step two: feeding the mixture into a screw extruder with a T-shaped head and a preparation injection opening on a charging barrel;

step three: heating the mixture in the charging barrel at different stages;

step four: heating the mixture, extruding, and simultaneously quantitatively injecting isopentane or carbon dioxide from a preparation injection port according to the mixture ratio;

step five: conveying the extruded sheet foam blank to a conveyor with a plurality of pairs of compression rollers for compression roller molding;

step six: cooling the shaped foam to obtain a sheet foam finished product;

step seven: and (4) feeding the sheet foam finished product into a plastic sucking machine to be made into various packaged products.