CN101161718A - Biological degradation liquid film and preparation method - Google Patents
Biological degradation liquid film and preparation method Download PDFInfo
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- CN101161718A CN101161718A CNA2007100563533A CN200710056353A CN101161718A CN 101161718 A CN101161718 A CN 101161718A CN A2007100563533 A CNA2007100563533 A CN A2007100563533A CN 200710056353 A CN200710056353 A CN 200710056353A CN 101161718 A CN101161718 A CN 101161718A
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- aqueous solution
- polyvinyl alcohol
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Abstract
The invention belongs to a biodegradation liquid mulching film and the preparation method thereof. The invention prepares polyvinyl alcohol into an aqueous solution with mass fraction of 5-10 percent; carboxymethyl cellulose is also prepared into an aqueous solution with mass fraction of 5-10 percent; starch with mass fraction of 5-10 percent is added into a reactor having an agitator, a condenser and a thermometer and is gelatinized for 30 minutes under 75-85 DEG C and then becomes transparent and slabby starch paste, the prepared polyvinyl alcohol solution and carboxymethyl cellulose solution are then added into the reactor, and surfactant and plasticizer are also added into the solution. The PH value is set as 2-4, cross-linking agent is then added, and the biodegradation liquid mulching film is obtained after 1-2-hour reaction under 85-90 DEG C. The film can be sprayed to the land surface through spray method after being thinned up.
Description
Technical field
The present invention relates to a kind of biological degradation liquid film and preparation method, belong to the preparing technical field of macromolecular material.
Background technology
Drought and water shortage is a worldwide difficult problem, and efficiently utilizing water resources is the gordian technique of 21 century agricultural sustainable development.Scientific circles both domestic and external were carrying out and were carrying out arduous exploration to water-saving technology aspect the theory and practice.Simultaneously, desertification of land also has a strong impact on Economic development, is the common issue that faces in the environment protection of countries in the world.China's land deterioration, 2100 square kilometres in newly-increased every year on average desertification soil has a strong impact on and restricts further developing of Chinese national economy.The geographic soil of NORTHWEST CHINA desertifies and is on the rise, and the sandstorm that causes thus is also more and more fiery, and the lack of water short of rain of northern area is also brought many problems to the agricultural development and the eubiosis.
Utilize the plastic film cultivation technique to become one of well-known ten multi-form agriculture technology in last century, using mulch film can satisfy farm crop insulation, soil moisture conservation, keep fertility to reach the needs of increasing both production and income, brought certain benefit for growth and the high yield of crop, but plastic film is the plastics film that is formed through the blow moulding machine manufacturing by polyethylene or polystyrene etc., mainly have following shortcoming: 1, raw material is difficult to decompose, and is big for environment pollution; 2, film and soil adhesion are insufficient, and tack is poor; 3, need artificial rupture of membrane, time-consuming; 4, cost is higher.In order to reduce the covering expense, the thickness of film has been reduced to below 10 microns, and this has just further increased the difficulty that residual film reclaims, and has aggravated the pollution of residual film to soil; Although 5 have released disintegration-type or the photodegradation plastic mulch film that can degrade both at home and abroad, but all there is big problem at aspects such as intensity, cost and degradation characteristics, incomplete the residual vinyon fragment of degrading can not mix with soil, actually causes secondary to soil to destroy again and pollutes.It costs an arm and a leg simultaneously, makes input cost increase by 2～3 times, considers to be difficult for promoting from economic aspect.
Based on above reason, the research worker has proposed the notion of liquid ground film through unremitting effort both at home and abroad, promptly uses macromolecular organic compound, converts and is sprayed at soil surface or water surface formation thin film after water dilutes.
Chinese patent, application number are 02121393.3 to disclose and be entitled as " lignin water conservation and moisture-holding composite liquid mulching film ", the prepared composite liquid mulching film of this method by xylogen, chitosan, collagen protein, tensio-active agent and whipping agent through mixing.In order to improve film-forming properties, add chitosan, collagen protein, this makes liquid ground film more soluble in water on the one hand, makes liquid ground film more improve cost on the other hand.Chinese patent, application number are 98107594 to disclose and be entitled as " a kind of liquid ground film and preparation method thereof ", and the raw material that the prepared liquid ground film of this method is selected for use has a large amount of pitch, after this liquid ground film is used, easily cause second environmental pollution, and the cost height, be difficult to promote.
Summary of the invention
The object of the invention provides a kind of biological degradation liquid film and preparation method, and it is raw material that biodegradable polyvinyl alcohol, carboxymethyl cellulose and W-Gum are adopted in this invention, by certain a kind of biological degradation liquid film of crosslinked, toughness reinforcing acquisition.
The composition formation and the mass percent proportioning that the invention provides a kind of biological degradation liquid film are as follows: 20-50 part polyvinyl alcohol, 10-20 part carboxymethyl cellulose, 10-20 part W-Gum, the tensio-active agent of 0.2-2.5 part, the linking agent of the softening agent of 1-5 part and 2-10 part;
Described tensio-active agent is: Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, polyoxyethylene mono-laurate or tween-80;
Described softening agent is: glycerol;
Described linking agent is: formaldehyde or glutaraldehyde.
The step and the condition that the invention provides a kind of biological degradation liquid film preparation method are as follows:
Take by weighing starting material by proportioning, polyvinyl alcohol and carboxymethyl cellulose are mixed with the aqueous solution of 5-10% massfraction respectively; Is massfraction that the aqueous solution of 5-10% starch adds and to have agitator, in the reactor of condenser, thermometer, 75-85 ℃ of following gelatinization 30 minutes, become transparent heavy-gravity starch paste, adding the aqueous solution of the polyvinyl alcohol for preparing in advance and the aqueous solution of carboxymethyl cellulose then respectively, again tensio-active agent and softening agent are added in the blended aqueous solution. adjust pH is 2-4, adds linking agent, reacted 1-2 hour down at 85-90 ℃, obtain a kind of biological degradation liquid film.
Thin up 2-10 doubly can be through spray method to the surface, soil.
The present invention has following advantage:
Raw material of the present invention all is biodegradable raw material, and raw material inexpensive, be easy to get, easy to use, the different proportionings of three kinds of raw materials can act synergistically and regulate degradation rate, can improve ground film strength and water tolerance by to a certain degree crosslinked.
Embodiment
Embodiment 1: get the amidin of 200 grams, 5% massfraction, stir gelatinization 30 minutes down at 75 ℃, become transparent heavy-gravity starch paste.The polyvinyl alcohol water solution that adds 500 grams, 10% massfraction then, the aqueous solution of the carboxymethyl cellulose of 250 grams, 8% massfraction, add 2.5 gram polyoxyethylene mono-laurates, add 5 gram glycerol, regulating the pH value is 2, add 10 gram formaldehyde down 85 ℃ of temperature, reacted 2 hours, obtain a kind of biological degradation liquid film.
Embodiment 2: get the amidin of 200 grams, 10% massfraction, stir gelatinization 30 minutes down at 80 ℃, become transparent heavy-gravity starch paste.The polyvinyl alcohol water solution that adds 375 grams, 8% massfraction then, the aqueous solution of the carboxymethyl cellulose of 200 grams, 5% massfraction, add 2 gram sodium lauryl sulphate, add 3 gram glycerol, regulating the pH value is 3, add 8 gram formaldehyde down 88 ℃ of temperature, reacted 1.5 hours, obtain a kind of biological degradation liquid film.
Embodiment 3: get the amidin of 200 grams, 8% massfraction, stir gelatinization 30 minutes down at 85 ℃, become transparent heavy-gravity starch paste.The polyvinyl alcohol water solution that adds 400 grams, 5% massfraction then, the aqueous solution of the carboxymethyl cellulose of 200 grams, 10% massfraction, add 0.2 gram Sodium dodecylbenzene sulfonate, add 1 gram glycerol, regulating the pH value is 3, add 2 gram glutaraldehyde down 90 ℃ of temperature, reacted 1 hour, obtain a kind of biological degradation liquid film.
Embodiment 4: get the amidin of 200 grams, 5% massfraction, stir gelatinization 30 minutes down at 75 ℃, become transparent heavy-gravity starch paste.Add 500 grams, 10% massfraction polyvinyl alcohol water solution then, the aqueous solution of the carboxymethyl cellulose of 200 grams, 8% massfraction, add 1.5 gram tween-80s, add 4 gram glycerol, regulating the pH value is 4, add 9 gram formaldehyde down 85 ℃ of temperature, reacted 2 hours, obtain a kind of biological degradation liquid film.
Claims (2)
1. biological degradation liquid film, its composition formation and mass percent proportioning are as follows: 20-50 part polyvinyl alcohol, 10-20 part carboxymethyl cellulose, 10-20 part W-Gum, 0.2-2.5 the tensio-active agent of part, the linking agent of the softening agent of 1-5 part and 2-10 part;
Described tensio-active agent is: Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, polyoxyethylene mono-laurate or tween-80;
Described softening agent is: glycerol;
Described linking agent is: formaldehyde or glutaraldehyde.
2. a kind of biological degradation liquid film as claimed in claim 1 and preparation method is characterized in that, step and condition are as follows:
Take by weighing starting material by proportioning, polyvinyl alcohol and carboxymethyl cellulose are mixed with the aqueous solution of 5-10% massfraction respectively; Is massfraction that the aqueous solution of 5-10% starch adds and to have agitator, in the reactor of condenser, thermometer, 75-85 ℃ of following gelatinization 30 minutes, become transparent heavy-gravity starch paste, adding the aqueous solution of the polyvinyl alcohol for preparing in advance and the aqueous solution of carboxymethyl cellulose then respectively, again tensio-active agent and softening agent are added in the blended aqueous solution. adjust pH is 2-4, adds linking agent, reacted 1-2 hour down at 85-90 ℃, obtain a kind of biological degradation liquid film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100563533A CN101161718A (en) | 2007-11-27 | 2007-11-27 | Biological degradation liquid film and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100563533A CN101161718A (en) | 2007-11-27 | 2007-11-27 | Biological degradation liquid film and preparation method |
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| CN101161718A true CN101161718A (en) | 2008-04-16 |
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| CNA2007100563533A Pending CN101161718A (en) | 2007-11-27 | 2007-11-27 | Biological degradation liquid film and preparation method |
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