CN102408612A - Photodegradable and biodegradable polyethylene plastic bag - Google Patents

Abstract

The invention discloses a photodegradable and biodegradable polyethylene plastic bag, which is characterized by comprising the following components in parts by weight: 100 parts of LDPE (Low-Density Polyethylene), 5-10 parts of filler, 0.1-1.5 parts of compatibilizer, 0.1-1 part of photosensitizer, 1-10 parts of corn starch, 1-10 parts of microcrystalline cellulose and 2-11 parts of silane coupling agent. A preparation process comprises the following steps of: (1) crushing the corn starch, calcium carbonate powder and the microcrystalline cellulose into superfine grains; (2) drying the corn starch, adding the silane coupling agent to perform surface treatment, and adding the compatibilizer for later use; (3) adding an activating agent and a dispersing agent into the calcium carbonate powder for later use; (4) mixing the materials obtained by the steps (2) and (3), adding the LDPE, the microcrystalline cellulose and the photosensitizer, mixing with two rolls, crushing, extruding and granulating to obtain parent stock; and (5) mixing the photodegradable and biodegradable parent stock with the LDPE, drying, performing blow molding, reeling, and making bags to obtain the photodegradable and biodegradable polyethylene plastic bag. The plastic bag obtained by the invention can be broken into pieces in the time of about 15 days, can also be eroded and broken down by fungi, and achieves the photodegradation and biodegradation composite effect.

Description

But a kind of light, biodegradable polyethylene plastic bag

Technical field

But the present invention relates to a kind of light, biodegradable plastics, be suitable for preparing refuse bag, belong to the plastics field.

Background technology

Refuse bag is the requisite of people's daily life, but uses the facility and the direct contradiction of environmental pollution of refuse bag serious day by day, for this reason; Country has put into effect limit and has moulded order, but effect is not too obvious, except the usage quantity that reduces refuse bag; The material of refuse bag also is the one side that needs consideration; People begin to put forth effort to study the plastics bag that can degrade for this reason, though existing plastics bag can be degraded to fragment well in the environment that exposes, but the rubbish in city trends towards landfill method; The rubbish fragment that these are degraded into is embedded in rubbish or the soil, and then degradation effect is not obvious.

Summary of the invention

Technical problem to be solved by this invention provides a kind of biodegradable plastics, is suitable for preparing refuse bag, even by buried, also can well degrade, and can not degrade too early, influences result of use.

For solving the problems of the technologies described above, the present invention realizes like this

A kind of biodegradable polyethylene plastic bag is characterized in that comprising following component:

100 parts of LDPE, filler 5-10 part, expanding material 0.1-1.5 part, photosensitizers 0.1-1 part, W-Gum 1-10 part, Microcrystalline Cellulose 1-10 part, silane coupling agent 2-11 part.

Described filler is CaCO ₃Described expanding material is OPE-4; Described photosensitizers is FeST3; Silane coupling agent is KH570.

But the preparation process of a kind of light, biodegradable polyethylene plastic bag is following:

(1), W-Gum, calcium carbonate powders, Microcrystalline Cellulose are ground into ultra-fine grain;

(2), W-Gum is dry, add silane coupling agent and carry out surface treatment, add expanding material, subsequent use;

(3), the lime carbonate grinding adds acvator, dispersion agent, and is subsequent use;

(4), with the material mixing that step (2), (3) obtain, add LDPE, Microcrystalline Cellulose, photosensitizers, two rollers are mixing, fragmentation, extruding pelletization obtains masterbatch;

(5) but, with light, biodegradable masterbatch and LDPE combination drying, blowing, rolling, bag, but obtain light, biodegradable polyethylene plastic bag.

Microcrystalline Cellulose is a kind of Mierocrystalline cellulose depolymerization product, by the natural cellulose preparation, and the auxiliary materials that use to medicine, makeup more; Because the traditional understanding Mierocrystalline cellulose is a β type glucose configuration and starch is to belong to α type configuration, general glycase is only attacked Mierocrystalline cellulose, so Microcrystalline Cellulose is difficult for mouldy; Be inappropriate for degradable plastic product theoretically; But after the present invention adds Microcrystalline Cellulose, find that degradation effect is superior to traditional degradable plastic tablet, and degraded is more thorough; Possibly be with plastic composition taken place collaborative about, also possibly bring into play filler, emulsive effect simultaneously.

The present invention has following positive effect: the plastic material that the present invention obtains process behind the refuse bag can be in the time about 25 days splinter; Than the general cracked time of rubbish band in advance; And find through fungi erosion experiment back; This refuse bag can be reached photodegradation, biodegradable composite effect by the fungi erosion disintegration.

Embodiment

Below in conjunction with embodiment the present invention is done further detailed description.

Embodiment 1

But a kind of light, biodegradable polyethylene plastic bag, component is following:

100 parts of LDPE, 5 parts of fillers, 0.1 part of expanding material, 0.1 part of photosensitizers, W-Gum 1-10 part, 1 part of Microcrystalline Cellulose, 2 parts of silane coupling agents.

Described filler is CaCO ₃Described expanding material is OPE-4; Described photosensitizers is FeST3; Silane coupling agent is KH570.

The preparation process is following:

(1), W-Gum, calcium carbonate powders, Microcrystalline Cellulose are ground into ultra-fine grain;

(2), W-Gum is dry, add silane coupling agent and carry out surface treatment, add expanding material, subsequent use;

(3), the lime carbonate grinding adds acvator, dispersion agent, and is subsequent use;

(4), with the material mixing that step (2), (3) obtain, add LDPE, Microcrystalline Cellulose, photosensitizers, two rollers are mixing, fragmentation, extruding pelletization obtains masterbatch;

(5) but, with light, biodegradable masterbatch and LDPE combination drying, blowing, rolling, bag, but obtain light, biodegradable polyethylene plastic bag.

Embodiment 2

But a kind of light, biodegradable polyethylene plastic bag, component is following:

100 parts of LDPE, 8 parts of fillers, 0.5 part of expanding material, 0.3 part of photosensitizers, 8 parts of W-Gums, 6 parts of Microcrystalline Celluloses, 5 parts of silane coupling agents.

The preparation process is with embodiment 1.

Embodiment 3

But a kind of light, biodegradable polyethylene plastic bag, component is following:

100 parts of LDPE, 10 parts of fillers, 1.5 parts of expanding materials, 1 part of photosensitizers, 10 parts of W-Gums, 10 parts of Microcrystalline Celluloses, 11 parts of silane coupling agents.

Described filler is CaCO ₃Described expanding material is OPE-4; Described photosensitizers is FeST3; Silane coupling agent is KH570.

The preparation process is with embodiment 1.

But the prepared light of the embodiment of the invention, the mechanical property parameters of biodegradable plastic are seen table 1, and wherein the unit of tensile strength is that the unit of MPa, elongation at break is that the unit of %, angle tear strength is kN/m.

Table 1

But changing, prepared light, the parameter of biodegradable plastic under exposing naturally of the embodiment of the invention see table 2.

Table 2

Can know from table 2, after the polyethylene plastic bag that the present invention obtains exposes 25 days naturally, the plastic film incipient crack; Explanation after crackle appears in the surface, exposes the starch granules of filling after photoxidation for some time; Produce biological attack, reach photodegradation, biodegradable composite effect.

Above-mentioned embodiment does not limit technical scheme of the present invention in any form, and the technical scheme that mode obtained that every employing is equal to replacement or equivalent transformation all drops on protection scope of the present invention.

Claims (3)

1. but a light, biodegradable polyethylene plastic bag is characterized in that comprising following component:

100 parts of LDPE, filler 5-10 part, expanding material 0.1-1.5 part, photosensitizers 0.1-1 part, W-Gum 1-10 part, Microcrystalline Cellulose 1-10 part, silane coupling agent 2-11 part.

2. but light according to claim 1, biodegradable polyethylene plastic bag, the described filler of its characteristic is CaCO ₃Described expanding material is OPE-4; Described photosensitizers is FeST3; Silane coupling agent is KH570.

3. but based on the described a kind of light of claim 1, biodegradable polyethylene plastic bag, it is characterized in that the preparation process is following:

(1), W-Gum, calcium carbonate powders, Microcrystalline Cellulose are ground into ultra-fine grain;

(2), W-Gum is dry, add silane coupling agent and carry out surface treatment, add expanding material, subsequent use;

(3), the lime carbonate grinding adds acvator, dispersion agent, and is subsequent use;

(4), with the material mixing that step (2), (3) obtain, add LDPE, Microcrystalline Cellulose, photosensitizers, two rollers are mixing, fragmentation, extruding pelletization obtains masterbatch;

(5) but, with light, biodegradable masterbatch and LDPE combination drying, blowing, rolling, bag, but obtain light, biodegradable polyethylene plastic bag.