CN104945818A - Rice-hull-ash-modified full-degradable plastic film and preparation method thereof - Google Patents

Abstract

The invention discloses a rice-hull-ash-modified full-degradable plastic film. The invention is characterized in that the plastic film is prepared from the following raw materials in parts by weight: 50-70 parts of cassava starch, 5-10 parts of rice hull ash, 1-2 parts of citric acid, 5-10 parts of gelatin, 10-20 parts of polyvinyl alcohol, 10-20 parts of glycerol, 1-2 parts of silane coupling agent KH-550, 1-2 parts of hydroxyethyl cellulose, 5-10 parts of maleic anhydride and 1-2 parts of styrene-acrylic emulsion. The full-degradable plastic film has the advantages of favorable uniformity, high tensile property, high strength, favorable water resistance, wide raw material sources, low price, environment friendliness, high degradability and high practicality.

Description

A kind of rice hull ash modification Based Full-degradable Plastics Film and preparation method thereof

Technical field

The present invention relates to wrapping material field, be specifically related to a kind of rice hull ash modification Based Full-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 rice hull ash modification Based Full-degradable Plastics Film, processing characteristics and good mechanical properties, be easy to degraded, environmental protection.

The present invention is achieved by the following technical solutions:

A kind of rice hull ash modification Based Full-degradable Plastics Film, it is obtained by the raw material of following weight parts:

Tapioca (flour) 50-70, rice hull ash 5-10, citric acid 1-2, gelatin 5-10, polyvinyl alcohol 10-20, glycerine 10-20, silane resin acceptor kh-550 1-2, Natvosol 1-2, maleic anhydride 5-10, benzene emulsion 1-2.

A preparation method for rice hull ash modification Based Full-degradable Plastics Film, it comprises the following steps:

(1) add water by solid-liquid weight ratio 1:1-1:2 after being mixed with rice hull ash by tapioca (flour), add citric acid after stirring, 60-80 DEG C is stirred 0.5-1h, obtains mixed slurry;

(2) mix with water by solid-liquid weight ratio 1:20-1:25 after being mixed with Natvosol by gelatin, 80-90 DEG C is stirred 2-4h, obtains mixed solution;

(3) mixed slurry in (1) and the mixed solution in (2) are jointly 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 at same temperature, keep pH stirring reaction 4-8h between 8.5-9.0, then pH be adjusted to neutrality and filter, obtaining modified base material;

(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 base material in (3) and benzene emulsion 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 rice hull ash, gelatin and Natvosol carry out modification formation 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 benzene emulsions, 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, degradation property is good, practical.

Embodiment

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

A kind of rice hull ash modification Based Full-degradable Plastics Film, is prepared from by the component raw material of following weight (kg):

Tapioca (flour) 60, rice hull ash 8, citric acid 1.5, gelatin 8, polyvinyl alcohol 15, glycerine 15, silane resin acceptor kh-550 1.5, Natvosol 1.5, maleic anhydride 8, benzene emulsion 1.5.

The preparation method of rice hull ash modification Based Full-degradable Plastics Film comprises the following steps:

(1) add water by solid-liquid weight ratio 1:1 after being mixed with rice hull ash by tapioca (flour), add citric acid after stirring, 80 DEG C are stirred 0.5h, obtain mixed slurry;

(2) mix with water by solid-liquid weight ratio 1:20 after being mixed with Natvosol by gelatin, 80 DEG C are stirred 3h, obtain mixed solution;

(3) mixed slurry in (1) and the mixed solution in (2) are jointly added reactor and stir 1h in 80-90 DEG C, with 5%NaOH solution by pH regulator to 8.5-9.0, then add maleic anhydride at same temperature, keep pH stirring reaction 6h between 8.5-9.0, then pH be adjusted to neutrality and filter, obtaining modified base material;

(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 base material in (3) and benzene emulsion 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): 48.6;

Elongation at break: 41.4%;

Water-intake rate: 29.7%;

100d degradation rate: 25.5%.

Claims (2)

1. a rice hull ash modification Based Full-degradable Plastics Film, is characterized in that, it is obtained by the raw material of following weight parts:

Tapioca (flour) 50-70, rice hull ash 5-10, citric acid 1-2, gelatin 5-10, polyvinyl alcohol 10-20, glycerine 10-20, silane resin acceptor kh-550 1-2, Natvosol 1-2, maleic anhydride 5-10, benzene emulsion 1-2.

2. the preparation method of a kind of rice hull ash modification Based Full-degradable Plastics Film according to claim 1, is characterized in that, comprise the following steps:

(1) add water by solid-liquid weight ratio 1:1-1:2 after being mixed with rice hull ash by tapioca (flour), add citric acid after stirring, 60-80 DEG C is stirred 0.5-1h, obtains mixed slurry;

(2) mix with water by solid-liquid weight ratio 1:20-1:25 after being mixed with Natvosol by gelatin, 80-90 DEG C is stirred 2-4h, obtains mixed solution;

(3) mixed slurry in (1) and the mixed solution in (2) are jointly 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 at same temperature, keep pH stirring reaction 4-8h between 8.5-9.0, then pH be adjusted to neutrality and filter, obtaining modified base material;

(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 base material in (3) and benzene emulsion 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.