Photodegradation-resistant biodegradable film and preparation method thereof

A biodegradation and photodegradation technology, applied in the field of biodegradable film and its preparation, can solve environmental pollution, accumulation and other problems, achieve the effect of improving mechanical properties, good compatibility and broad application prospects

Inactive Publication Date: 2021-03-12
嘉兴市轩禾园艺技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of their use in biodegradable mulches is that after the film biodegrades, it leads to accumulation in the ground causing environmental pollution

Method used

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  • Photodegradation-resistant biodegradable film and preparation method thereof
  • Photodegradation-resistant biodegradable film and preparation method thereof
  • Photodegradation-resistant biodegradable film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of embodiment 1 light stabilizer:

[0038] Refer to attached Figure 1-3 , including the following steps:

[0039] S1. Add 1mol UV-5 and 1mol diethyl maleate into the reactor, then add 100mL toluene, heat to 45°C to dissolve, add 0.01mol p-toluenesulfonic acid, and react at reflux for 4h under nitrogen protection. Precipitate with anhydrous ether and dry to obtain intermediate II with the following structure:

[0040] S2. Add 1 mol of intermediate II, 1.1 mol of 2,2,6,6-tetramethylpiperidinol and 150 mL of toluene into the reactor, heat to 50°C and stir to dissolve, then add 5 mL of tetra-n-butyl titanate and heat up to Reflux, nitrogen protection, react for 5h, the product was precipitated with anhydrous ether and washed several times, dried to obtain intermediate III, the structure is as follows:

[0041]

[0042] S3. Dissolve 1mol cinnamaldehyde in 100mL ethanol to obtain cinnamaldehyde solution, disperse 10g chitosan in 100mL methanol, swell ...

Embodiment 2

[0047] The preparation of embodiment 2 light stabilizers:

[0048] Refer to attached Figure 1-3 , including the following steps:

[0049] S1. Add 1mol UV-5 and 1.1mol diethyl maleate into the reactor, then add 200mL toluene, heat to 50°C to dissolve, add 0.05mol p-toluenesulfonic acid, and react at reflux for 5h under nitrogen protection. Precipitate with anhydrous ether and dry to obtain intermediate II;

[0050] S2. Add 1 mol of intermediate II, 1.2 mol of 2,2,6,6-tetramethylpiperidinol and 300 mL of toluene into the reactor, heat to 60°C and stir to dissolve, then add 10 mL of tetra-n-butyl titanate, and raise the temperature to Reflux, nitrogen protection, react for 10h, the product was precipitated with anhydrous ether and washed several times, dried to obtain intermediate III;

[0051] S3. Dissolve 1mol cinnamaldehyde in 150mL ethanol to obtain cinnamaldehyde solution, disperse 10g chitosan in 200mL methanol, swell at room temperature for 2h, heat to 90°C with microw...

Embodiment 3

[0062] The preparation method of the biodegradable film of embodiment 3 anti-photodegradation

[0063] Include the following steps:

[0064] S1. Mix and dissolve 100g starch and 200g lignin in PBS buffer solution with a pH of 7, add 2.5g amylase and 3g cellulase, heat in a water bath to 50°C, react for 1h, heat at 100°C for 10min to inactivate the enzyme, and pump After filtering and drying, configure a slurry with a mass fraction of 45% with distilled water, carry out mechanical treatment with a refiner, stop beating when the beating degree reaches 88°SR, and use a homogenizer to homogenize the beaten slurry , to obtain fine starch cellulose;

[0065] S2. Mix 100g of fine starch cellulose, 1g of silane coupling agent KH570 and 1000g of 35wt% ethanol solution, heat to 50°C for 0.5h, then filter with suction, and add 200g of polylactic acid-glycolic acid copolymer into the distillate to dissolve the solid. In 500mL of methyl chloride solution, after stirring and mixing evenly...

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Abstract

The invention provides a photodegradation-resistant biodegradable film and a preparation method thereof. The preparation method comprises the following steps: S1, mixing and dissolving starch and lignin in a buffer solution, adding amylase and cellulase, carrying out a water-bath heating reaction, carrying out high-temperature enzyme deactivation, carrying out suction filtration, performing drying, then preparing a slurry from a dried product and distilled water, and carrying out mechanical and homogeneous treatment to obtain fine starch cellulose; and S2, mixing the fine starch cellulose, a silane coupling agent and an ethanol solution, carrying out heating for a reaction, carrying out suction filtration, adding a solid into a dichloromethane solution dissolved with a polylactic acid-glycolic acid copolymer, adding a light stabilizer, a plasticizer and a flexibilizer, carrying out uniform stirring, paving a formed mixture in a glass tank, and conducting drying to form a film, therebyobtaining the photodegradation-resistant biodegradable film. The preparation method disclosed by the invention is simple, and the prepared film is prepared by compounding the polylactic acid-glycolicacid copolymer and the fine starch lignin, has the excellent properties of high hydrophilicity, thermal barrier property, biocompatibility, excellent mechanical property, high thermal deformation temperature and the like, and presents wide application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a photodegradable biodegradable film and a preparation method thereof. Background technique [0002] Mulching is an operation practiced in agriculture that involves covering the ground with a protective layer that prevents, for example, the growth of weeds, retains moisture, inhibits corrosion and increases soil temperature. Plastic films (known as mulches) have long been widely used, which offer many advantages such as significantly lower water consumption, earlier harvests, less wash-off of fertilizers, and less compaction of the soil and therefore better aeration. [0003] A further advantage of biodegradable mulches, which degrade by the action of microorganisms present in the subsurface, is that they do not have to be removed at the end of the cultivation cycle, and are becoming more widespread. In some applications, the mulches include pigments, primarily black p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F222/22C08J5/18C08L67/04C08L97/00C08L3/02C08L51/02A01G13/02
CPCA01G13/0275C08F251/00C08J5/18C08J2367/04C08J2403/02C08J2451/02C08J2497/00C08F222/22Y02A40/28
Inventor 不公告发明人
Owner 嘉兴市轩禾园艺技术有限公司
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