High-barrier biodegradable mulch film and preparation method thereof

A biodegradable, high-barrier technology, applied in the fields of botanical equipment and methods, chemical instruments and methods, plant protection, etc., can solve problems such as the inability to meet the needs of crop growth, poor barrier properties of mulch products, and difficult processing, and achieve good biodegradation. properties, high melting point and strength, low production cost

Inactive Publication Date: 2018-10-23
南通华盛高聚物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to meet the requirements of biodegradability, the main materials currently available on the market for making biodegradable mulch films are PBAT and aliphatic polycarbonate, etc. However, PBAT is used as a raw material to make mulch films alone, and the barrier properties of the mulch products are too poor, such as PE The water vapor transmission rate of the mulch film is 70g / m2.d, while the water vapor transmission rate of the PBAT mulch film is 2500g / m2.d) under the same thickness, which cannot meet the growth needs of most crops; and it is made of aliphatic polycarbonate Mulching film, due to the unique carbonate structure of aliphatic polycarbonate, has high weather resistance and barrier properties (polycarbonate water vapor transmission rate 200g / m2.d), but aliphatic polycarbonate alone has a low melting point, Poor strength, difficult to process and other shortcomings, so there is no such mulch film products on the market

Method used

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  • High-barrier biodegradable mulch film and preparation method thereof
  • High-barrier biodegradable mulch film and preparation method thereof
  • High-barrier biodegradable mulch film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 Embodiment 3

[0060] A high-barrier biodegradable mulch film is made of the following raw materials in the following weight percentages:

[0061]

[0062] Above-mentioned aliphatic polycarbonate is selected from a kind of in polybutylene carbonate, polypentamethylene carbonate, polyhexamethylene carbonate, polypropylene carbonate, poly(carbonic acid-terephthalic acid) butylene or its combination, and the molecular weight of aliphatic polycarbonate is 40,000-150,000. Embodiment one to embodiment three select polybutylene carbonate for use.

[0063] The above-mentioned inorganic filler is selected from titanium dioxide, talc powder, barium sulfate or a combination thereof, and the particle size of the inorganic filler is greater than 2000 mesh. The preferred inorganic filler in Embodiment 1 to Embodiment 3 is talc powder.

[0064] The above-mentioned light stabilizer is selected from hindered amine light stabilizers, one or a combination of ultraviolet absorbers; the above-mentioned ultra...

Embodiment 4 Embodiment 15

[0076]

[0077]

[0078]

[0079]

[0080] Compared with Example 1, Example 4 to Example 15 are only different in the high barrier biodegradable mulch film raw materials and their percentages, and the preparation methods and the selection of related auxiliary materials and auxiliary agents are consistent, so that Examples 4 to 10 are obtained. No. 5 high-barrier mulch products.

[0081] By testing the water vapor transmission rate of the mulching film products in the above twelve embodiments, it can be found that the water vapor transmission rate of the high-barrier biodegradable mulching film products in Examples 4 to 15 is significantly lower than the PBAT mulching film under the same thickness condition, At the same time, the water vapor transmission rate is significantly higher than that of PE plastic film, and its water vapor transmission rate is suitable for the growth needs of most economic crops, so that the economic crops are in a suitable humidity conditio...

Embodiment 16 Embodiment 18

[0083] A heat-retaining, moisturizing and high-transmittance biodegradable mulch film, comprising a main layer of a transparent mulch film and an anti-fog inner layer;

[0084] Wherein the transparent mulch main layer is made of the following components by weight percentage:

[0085]

[0086] The difference between Embodiment 16 and Embodiment 18 lies only in the proportion of fumed silica in the entire formula, and the proportion of fumed silica mainly affects the composite effect of the hydrophilic anti-fog coating and the main layer of the transparent mulching film.

[0087] The preparation of the main layer of the transparent mulch film includes the following steps: the raw materials are sequentially melt-blended, granulated and blown to obtain a main layer product of the biodegradable transparent mulch film;

[0088] a. After mixing the raw materials of the main layer of transparent mulching film evenly, put them into a twin-screw extruder for melt blending;

[0089] ...

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Abstract

The invention discloses a high-barrier biodegradable mulch film comprising the following components by weight: 10-40% of aliphatic polycarbonate, 50-70% of PBAT, 1-5% of an inorganic filler, 0.1-2% ofa light stabilizer, 0.1-2% of a lubricant and 0.1-2% of a heat stabilizer, the aliphatic polycarbonate is used to modify a PBAT mulch film to obtain the high-barrier biodegradable mulch film product,the the high-barrier biodegradable mulch film product can meet the growth needs of most crops, and has good degradability; and compared with a mulch film made from a raw material of the aliphatic polycarbonate the high-barrier biodegradable mulch film product has higher melting point and strength, lowered processing difficulty, lowered production cost, good biodegradability, and good applicationprospects.

Description

technical field [0001] The invention relates to a completely biodegradable mulch film, in particular to a high-barrier biodegradable mulch film and a preparation method thereof. Background technique [0002] my country's plastic film cultivation technology was introduced from Japan in 1978. After experiments and demonstrations, it was quickly popularized and applied in my country. In 1983, the area covered by agricultural plastic film reached 9.437 million mu. From economic crops such as sugar, tobacco, grain and more than 10 fields, so far, my country's agricultural film covers more than 400 million mu of land, and it has reached about 2.7 million tons in 2010, ranking first in the world. However, with the extensive application of mulch film, more and more residual film is accumulated in the soil, which hinders the downward migration of soil moisture and nutrients, reduces soil porosity and permeability, and is not conducive to soil air circulation and The exchange affects t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L69/00C08K3/22C08K3/34C08K3/30C08K5/20C08K5/09C08K13/02C08J5/18A01G13/02B32B27/36B32B27/18B32B27/06B32B27/08B32B33/00
CPCA01G13/0275B32B27/08B32B27/18B32B27/36B32B27/365B32B33/00B32B2255/10B32B2255/26B32B2307/31B32B2307/416B32B2307/7265B32B2410/00C08J5/18C08J2367/02C08J2469/00C08K3/34C08K5/09C08K5/20C08K13/02C08K2003/2241C08K2003/3045Y02A40/28
Inventor 张春华沈坤良冯爱华
Owner 南通华盛高聚物科技股份有限公司
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