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Degradable mulching film capable of persistently retaining water and increasing fertility as well as preparation method and degradation method of degradable mulching film

A degradable mulch film and long-lasting technology, which is applied in the direction of fertilization devices, plant protection covers, fertilizer mixtures, etc., can solve the problems of no longer having water retention effect and unfavorable soil long-term water retention, and achieve the effect of long-lasting water retention and delaying the degradation process

Pending Publication Date: 2022-07-29
祝建东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degradation rate of polyamino acid is very fast, and it no longer has water retention after degradation, which is not conducive to the long-term water retention of soil.

Method used

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  • Degradable mulching film capable of persistently retaining water and increasing fertility as well as preparation method and degradation method of degradable mulching film
  • Degradable mulching film capable of persistently retaining water and increasing fertility as well as preparation method and degradation method of degradable mulching film
  • Degradable mulching film capable of persistently retaining water and increasing fertility as well as preparation method and degradation method of degradable mulching film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The polyaspartic acid hydrogel was ultrasonically stirred and broken for 2 hours, and divided into three parts: the first part was recorded as hydrogel A; the second part was added with ammonium chloride and mixed evenly, and it was recorded as hydrogel B; The third part is added with calcium hydroxide and mixed evenly, which is denoted as hydrogel C; the ultrasonic frequency is 40kHz, the power is 1500W; the stirring speed is 2500rpm, and the stirring method is to change the stirring direction every 5min;

[0034] (2) Dissolve isosorbide-type polycarbonate in dichloromethane and divide it into two parts: the first part is denoted as solution D; the second part is added with potassium dihydrogen phosphate and dispersed evenly, denoted as mixed solution E;

[0035](3) Freeze-dry the hydrogel A into a gel powder, spray and deposit the mixed solution E on the surface of the powder, and vacuum dry to obtain a double-layer powder 1; add the double-layer powder 1 to the hy...

Embodiment 2

[0039] (1) The polyaspartic acid hydrogel was ultrasonically stirred and broken for 3 hours, and divided into three parts: the first part was recorded as hydrogel A; the second part was added with ammonium chloride and mixed evenly, and it was recorded as hydrogel B; The third part is added with calcium hydroxide and mixed evenly, which is recorded as hydrogel C; the ultrasonic frequency is 37kHz, the power is 1300W; the stirring speed is 2300rpm, and the stirring method is to change the stirring direction every 8min;

[0040] (2) Dissolve isosorbide-type polycarbonate in dichloromethane and divide it into two parts: the first part is denoted as solution D; the second part is added with potassium dihydrogen phosphate and dispersed evenly, denoted as mixed solution E;

[0041] (3) Freeze-dry the hydrogel A into a gel powder, spray and deposit the mixed solution E on the surface of the powder, and vacuum dry to obtain a double-layer powder 1; add the double-layer powder 1 to the ...

Embodiment 3

[0045] (1) The polyaspartic acid hydrogel was ultrasonically stirred and broken for 3 hours, and divided into three parts: the first part was recorded as hydrogel A; the second part was added with ammonium chloride and mixed evenly, and it was recorded as hydrogel B; The third part is added with calcium hydroxide and mixed evenly, which is recorded as hydrogel C; the ultrasonic frequency is 38kHz, the power is 1400W; the stirring speed is 2400rpm, and the stirring method is to change the stirring direction every 7min;

[0046] (2) Dissolve isosorbide-type polycarbonate in dichloromethane and divide it into two parts: the first part is denoted as solution D; the second part is added with potassium dihydrogen phosphate and dispersed evenly, denoted as mixed solution E;

[0047] (3) Freeze-dry the hydrogel A into a gel powder, spray and deposit the mixed solution E on the surface of the powder, and vacuum dry to obtain a double-layer powder 1; add the double-layer powder 1 to the ...

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Abstract

The invention relates to the field of agricultural films, and provides a degradable mulching film capable of persistently retaining water and increasing fertility as well as a preparation method and a degradation method thereof. The degradable mulching film comprises the following components: polylactic acid, poly (butylene adipate-co-terephthalate), 1, 4-bis (tert-butylperoxy isopropyl) benzene, four-layer powder 1 and four-layer powder 2. The four layers of powder 1 are respectively a polyaspartic acid gel layer, a monopotassium phosphate / isosorbide polycarbonate layer, an ammonium chloride / polyaspartic acid gel layer and an isosorbide polycarbonate layer from inside to outside. The four layers of powder 2 are respectively a polyaspartic acid gel layer, a monopotassium phosphate / isosorbide polycarbonate layer, a calcium hydroxide / polyaspartic acid gel layer and an isosorbide polycarbonate layer from inside to outside. Through the special structures of the four layers of powder 1 and the four layers of powder 2, the degradation process of the polyaspartic acid water-retaining agent can be delayed, and meanwhile, nutrients are continuously supplemented for soil, so that the lasting water-retaining and fertility-increasing effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of agricultural films, and provides a degradable mulch film capable of lasting water retention and fertilization, as well as a preparation method and a degradation method. Background technique [0002] In agricultural farming, soil moisture content is very important for crop growth. Water loss not only reduces soil water content, but also accompanies nutrient loss, seriously affecting crop yield or quality. Commonly used methods for maintaining soil moisture include mulching with plastic film, covering crop straws or plant ash, cultivating and loosening the soil, using glass or plastic greenhouses, and applying water-retaining agents. [0003] The mulch film has strong air tightness, which can reduce water evaporation after covering the soil, and has a good effect on maintaining soil moisture. Degradable mulch is a mulch made of degradable plastics, commonly used polylactic acid, polycaprolactone, polybuty...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L79/08C08L69/00C08K3/32C08K3/28C08K3/22C08K5/14C08J5/18C05G3/40C05G3/80C05G5/16A01G13/02
CPCC08J5/18A01G13/0275C05B7/00C05G3/40C05G3/80C05G5/16C08J2367/02C08J2467/04C08J2479/08C08J2469/00C08K2003/324C08K3/28C08K2003/2206C08K5/14C05C9/00Y02A40/28
Inventor 祝建东赵寿山姚利
Owner 祝建东
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