CN104945678A - Chestnut shell-based full-degradable plastic film and preparation method thereof - Google Patents

Abstract

The invention discloses a chestnut shell-based full-degradable plastic film. The chestnut shell-based full-degradable plastic film is characterized by being prepared from the following raw materials in parts by weight: 30-40 parts of cassava starch, 20-30 parts of chestnut shell, 2-4 parts of sodium tripolyphosphate, 2-4 parts of urea, 10-20 parts of polyvinyl alcohol, 10-20 parts of glycerol, 1-2 parts of a silane coupling agent KH-550, 5-10 parts of maleic anhydride, 0.5-1 part of dodecyl polyglucoside and 2-4 parts of linseed oil. The full-degradable plastic film has good uniformity, high tensile property, high strength, good water resistance, available raw materials, low cost, environment friendliness, energy conservation, waste utilization, good degradation property and strong practicability.

Description

A kind of chestnut shell based fully degradable plastics film and preparation method thereof

Technical field

The present invention relates to wrapping material field, be specifically related to a kind of chestnut shell based fully degradable plastics film and preparation method thereof.

Background technology

Plastics are widely used in the every field of economy, life, as shopping bag, refuse bag, plastic cup, disposable lunch-box in life, and the plastic sheeting for farm use etc. in production.But due to plastics be difficult to degraded, be the source of " white pollution ", cause very important negative impact to physical environment.Along with the raising of the serious and environmental protection consciousness polluted, the biodegradable plastic of product has been subjected to and has paid close attention to widely as an alternative, becomes one of effective ways solving the problem of environmental pollution that plastic refuse causes.

PVA is the polyhydroxylated polymer obtained by Vinyl Acetate Copolymer Ester hydrolysis, have in wet environment under bacterium existent condition and can decompose completely in 6 months, therefore PVA degradative plastics system has characteristic that can be degradable, is real environmental protection completely degradable plastic.But PVA material and base-material consistency poor, be separated serious, this characteristic causes PVA plastics to be difficult to processing, and Mechanical Properties of Products is also poor.Therefore, need the consistency improving PVA and base-material, improve processing characteristics and the mechanical property of PVA plastics, thus improve the quality of products.

Summary of the invention

The object of this invention is to provide a kind of chestnut shell based fully degradable plastics film, processing characteristics and good mechanical properties, be easy to degraded, energy-conserving profit waste, environmental protection.

The present invention is achieved by the following technical solutions:

A kind of chestnut shell based fully degradable plastics film, it is obtained by the raw material of following weight parts:

Tapioca (flour) 30-40, chestnut shell 20-30, tripoly phosphate sodium STPP 2-4, urea 2-4, polyvinyl alcohol 10-20, glycerine 10-20, silane resin acceptor kh-550 1-2, maleic anhydride 5-10, Dodecyl Polyglucosides 0.5-1, linseed oil 2-4.

A preparation method for chestnut shell based fully degradable plastics film, it comprises the following steps:

(1) be ground to 200-400 order after being mixed with tripoly phosphate sodium STPP, urea by chestnut shell, then mix with tapioca (flour) and add water by solid-liquid weight ratio 1:1-1:2,60-80 DEG C is stirred 0.5-1h, obtains mixed slurry;

(2) mixed slurry in (1) added reactor and stir 1-2h in 80-90 DEG C, with 5%NaOH solution by pH regulator to 8.5-9.0, then add maleic anhydride stirring reaction 4-8h at same temperature, obtain modified slurry, in reaction process, keep pH between 8.5-9.0;

(3) pH of the modified slurry in (2) is adjusted to neutral rear drying completely, is ground to 400-500 order, obtains modified powder;

(4) first 800-1200r/min after glycerine and silane resin acceptor kh-550 mixing is stirred 10-20min, then add polyvinyl alcohol 100-120 DEG C and stir 15-30min, finally add the modified powder in (3), Dodecyl Polyglucosides and linseed oil high-speed mixing 10-20min, add extruding pelletization under twin screw extruder 120-140 DEG C condition, obtain film pellet;

(5) the film pellet in (4) is formed plastic film by inflation film manufacturing machine blowing, finally get product after cutting, bundling, packaging.

Advantage of the present invention is:

In tapioca (flour), add chestnut shell and carry out modification and form base-material, and improved the interface compatibility of base-material and polyvinyl alcohol by maleic anhydride modified base-material, silane coupler modified polyvinyl alcohol, thus improve processing characteristics and the mechanical property of matrix material; And composite in conjunction with raw materials such as Dodecyl Polyglucosides, make the film uniformity that obtains good, tensile property is high, intensity is large, and water tolerance is better, and raw material sources are extensive simultaneously, and cheap, environmental protection, energy-conserving profit waste, degradation property is good, practical.

Embodiment

Non-limiting examples of the present invention is as follows:

A kind of chestnut shell based fully degradable plastics film, is prepared from by the component raw material of following weight (kg):

Tapioca (flour) 35, chestnut shell 25, tripoly phosphate sodium STPP 3, urea 3, polyvinyl alcohol 15, glycerine 15, silane resin acceptor kh-550 1.5, maleic anhydride 8, Dodecyl Polyglucosides 0.8, linseed oil 3.

The preparation method of chestnut shell based fully degradable plastics film comprises the following steps:

(1) be ground to 200 orders after being mixed with tripoly phosphate sodium STPP, urea by chestnut shell, then mix with tapioca (flour) and add water by solid-liquid weight ratio 1:1,80 DEG C are stirred 0.5-1h, obtain mixed slurry;

(2) mixed slurry in (1) added reactor and stir 1h in 90 DEG C, with 5%NaOH solution by pH regulator to 8.5-9.0, then add maleic anhydride stirring reaction 6h at same temperature, obtain modified slurry, in reaction process, keep pH between 8.5-9.0;

(3) pH of the modified slurry in (2) is adjusted to neutral rear drying completely, is ground to 500 orders, obtains modified powder;

(4) first 1200r/min after glycerine and silane resin acceptor kh-550 mixing is stirred 10min, then add polyvinyl alcohol 100 DEG C and stir 15min, finally add the modified powder in (3), Dodecyl Polyglucosides and linseed oil high-speed mixing 10min, add extruding pelletization under twin screw extruder 120-140 DEG C condition, obtain film pellet;

(5) the film pellet in (4) is formed plastic film by inflation film manufacturing machine blowing, finally get product after cutting, bundling, packaging.

Carry out performance test to above-mentioned obtained Based Full-degradable Plastics Film, test result is as follows:

Tensile strength (MPa): 55.9;

Elongation at break: 38.6%;

Water-intake rate: 27.5%;

100d degradation rate: 28.0%.

Claims (2)

1. a chestnut shell based fully degradable plastics film, is characterized in that, it is obtained by the raw material of following weight parts:

Tapioca (flour) 30-40, chestnut shell 20-30, tripoly phosphate sodium STPP 2-4, urea 2-4, polyvinyl alcohol 10-20, glycerine 10-20, silane resin acceptor kh-550 1-2, maleic anhydride 5-10, Dodecyl Polyglucosides 0.5-1, linseed oil 2-4.

2. the preparation method of a kind of chestnut shell based fully degradable plastics film according to claim 1, is characterized in that, comprise the following steps:

(1) be ground to 200-400 order after being mixed with tripoly phosphate sodium STPP, urea by chestnut shell, then mix with tapioca (flour) and add water by solid-liquid weight ratio 1:1-1:2,60-80 DEG C is stirred 0.5-1h, obtains mixed slurry;

(2) mixed slurry in (1) added reactor and stir 1-2h in 80-90 DEG C, with 5%NaOH solution by pH regulator to 8.5-9.0, then add maleic anhydride stirring reaction 4-8h at same temperature, obtain modified slurry, in reaction process, keep pH between 8.5-9.0;

(3) pH of the modified slurry in (2) is adjusted to neutral rear drying completely, is ground to 400-500 order, obtains modified powder;

(4) first 800-1200r/min after glycerine and silane resin acceptor kh-550 mixing is stirred 10-20min, then add polyvinyl alcohol 100-120 DEG C and stir 15-30min, finally add the modified powder in (3), Dodecyl Polyglucosides and linseed oil high-speed mixing 10-20min, add extruding pelletization under twin screw extruder 120-140 DEG C condition, obtain film pellet;

(5) the film pellet in (4) is formed plastic film by inflation film manufacturing machine blowing, finally get product after cutting, bundling, packaging.