阅读说明：本技术 一种易降解的腐植酸地膜 (Easily degradable humic acid mulching film ) 是由 闫银凤 杜俊鹏 黄晓谨 郝自娟 杨武涛 李勇敢 史海升 袁永浩 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种易降解的腐植酸地膜,属于膜材料领域。由如下组分制备而成,各组分以重量份计：复合微生物菌剂0.5-1.5；腐植酸14~18；羧甲基纤维素14~18；聚乙烯醇14~18；钠水玻璃0.5~1.5；十二烷基硫酸钠1~3；对甲苯磺酸0.5~1.5；硅酸钾0.5~1；山梨醇1-3,用磷酸调节pH值在7~8之间。所得腐植酸地膜是一种可完全降解地膜,保水效果、地表温度、作物生育期及降解程度等指标均有明显提升。(The invention discloses a degradable humic acid mulching film, and belongs to the field of film materials. The adhesive is prepared from the following components in parts by weight: 0.5-1.5 of compound microbial agent; 14-18 parts of humic acid; 14-18 parts of carboxymethyl cellulose; 14-18 parts of polyvinyl alcohol; 0.5-1.5 parts of sodium silicate; 1-3 parts of sodium dodecyl sulfate; 0.5-1.5 parts of p-toluenesulfonic acid; 0.5-1% of potassium silicate; 1-3 of sorbitol, and adjusting the pH value to 7-8 by using phosphoric acid. The obtained humic acid mulching film is a completely degradable mulching film, and the water retention effect, the surface temperature, the crop growth period, the degradation degree and other indexes are obviously improved.)

1. The degradable humic acid mulching film is characterized by being prepared from the following components in parts by weight:

0.5-1.5 parts of compound microbial agent

Humic acid 14-18

Carboxymethyl cellulose 14-18

Polyvinyl alcohol 14-18

Sodium silicate 0.5-1.5

Sodium dodecyl sulfate 1-3

P-toluenesulfonic acid 0.5-1.5

Potassium silicate 0.5-1

1-3 sorbitol

Adjusting the pH value to 7-8 by using phosphoric acid;

the compound microbial agent is selected from bacillus and lactic acid bacteria, and the volume ratio of the bacillus to the lactic acid bacteria is 1: 1.

2. the degradable humic acid mulching film according to claim 1,

the bacillus is selected from one or two of bacillus subtilis and bacillus licheniformis; the lactic acid bacteria are selected from one or two of lactobacillus plantarum, lactobacillus acidophilus and streptococcus thermophilus.

Technical Field

The invention relates to an easily degradable humic acid mulching film, and belongs to the field of film materials.

Technical Field

The common plastic mulching film is a high-molecular hydrocarbon prepared by adding an anti-ultraviolet agent and an antioxidant into polyvinyl chloride or polyethylene, has very large molecular weight and very stable various performances, can hardly decompose in the nature, and can be preserved in soil for more than 100-300 years. The plastic mulching film is remained in soil or abandoned in the field, is blown by wind to scatter everywhere, is hung on branches, field ends and buildings, and scatters in rivers, ditches and ponds, thereby seriously damaging the natural environment. The water can be accumulated in an irrigation channel, and the irrigation quality is damaged after deposition, so that the water environment is polluted, and the survival of fishes is threatened. The residue of the plastic mulch also destroys various physical properties of the soil such as water content, volume weight, porosity, and the like.

Humic acid substances are applied to agriculture, industry, garden and forestry, environmental engineering, medicine and health and the like. Particularly in the agricultural field, humic acid can be used as fertilizer, pesticide, soil conditioner, stimulin required by plant growth and the like; in the aspect of mulching films, a few reports about humic acid mulching films are currently related in China, and Chinese patent CN103880565A discloses a bioactive humic acid mulching film which is prepared by taking microorganisms as a base material, combining with humic acid, and adding plasticizing, thickening, reinforcing, cross-linking agents, herbicides and the like into a degradable liquid mulching film.

Disclosure of Invention

In order to avoid white pollution and improve soil quality, the invention aims to provide the fully degradable humic acid mulching film, which is not only beneficial to soil improvement, but also can better meet the growth requirement of crops.

In order to realize the purpose of the invention, firstly, flora capable of decomposing coal humic acid is screened, and then the flora, starch, polyvinyl alcohol, humic acid solution, cross-linking agent, reinforcing agent and the like are uniformly mixed according to a certain proportion under proper process conditions to obtain the degradable humic acid liquid mulching film.

The degradable humic acid mulching film is prepared from the following components in parts by weight:

0.5-1.5 parts of compound microbial agent

Humic acid 14-18

14-18 parts of carboxymethyl cellulose

14 to 18% of polyvinyl alcohol

0.5 to 1.5 parts of sodium silicate

Sodium dodecyl sulfate 1-3

0.5 to 1.5 parts of p-toluenesulfonic acid

0.5 to 1 part of potassium silicate

1-3 sorbitol

And adjusting the pH value to 7-8 by using phosphoric acid.

The compound microbial agent is selected from flora capable of decomposing coal humic acid, and mainly comprises bacillus and lactic acid bacteria, wherein the volume ratio of the bacillus to the lactic acid bacteria is 1: 1. the bacillus comprises one or two of bacillus subtilis and bacillus licheniformis; the lactic acid bacteria comprise one or more of lactobacillus plantarum, lactobacillus acidophilus and streptococcus thermophilus.

When in use, the black mulching film is sprayed on a flat ground by a watering can, and a layer of black mulching film can be formed in about 40 minutes.

The experimental scheme has the advantages that: the experimental reaction process is obviously accelerated by adding the p-toluenesulfonic acid, and the stability of a reaction system is improved; the addition of sorbitol improves the toughness and the degradation degree of the humic acid mulching film, and the addition proportion of sorbitol influences the toughness and the degradation degree of the humic acid mulching film. The obtained humic acid mulching film is a mulching film capable of being completely degraded, and the degradation product is a good fertilizer and pesticide. Compared with the Chinese patent CN103880565A, the indexes such as water retention effect, surface temperature, crop growth period, degradation degree and the like are obviously improved.

Detailed Description

To better illustrate the invention, the following examples are given: