Preparation of urea-formaldehyde/polybutylene succinate biodegradable polymer slow and controlled release material by reactive extrusion

A polybutylene succinate, biodegradable technology, applied in fertilizer mixtures, solid/semi-solid fertilizers, applications, etc., can solve the problems of difficulty in obtaining UF-based composite materials, low nitrogen release rate, complexity, etc., To achieve the effect of saving manpower, simple and effective preparation process, and good compatibility

Active Publication Date: 2021-11-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, large-scale preparation of UF particles is usually complicated because it involves reactions in liquid media, and formaldehyde solution as one of the main raw materials contains about 70 wt% water, which hinders simple, quick, conventional process to prepare it
In addition, the high crystallinity of UF polymer leads to its extremely low nitrogen release rate in practical applications.
At the same time, unfortunately, UF is thermosetting, has no fixed melting point, and can only be mixed with other materials in the process of melt blending, which makes it difficult to obtain UF-based composites with well-dispersed components
Preparation of composites of biodegradable polymers and nitrogen-containing fertilizers by extrusion process of industrial blending method and their slow and controlled release properties have been studied, however, all of them are urea / biodegradable polymer composites system, the preparation of UF / biodegradable polymer composites by extrusion process has not been reported yet

Method used

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  • Preparation of urea-formaldehyde/polybutylene succinate biodegradable polymer slow and controlled release material by reactive extrusion
  • Preparation of urea-formaldehyde/polybutylene succinate biodegradable polymer slow and controlled release material by reactive extrusion
  • Preparation of urea-formaldehyde/polybutylene succinate biodegradable polymer slow and controlled release material by reactive extrusion

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Experimental program
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Effect test

Embodiment 1 to 3

[0049] A method for preparing UF / PBS biodegradable polymer sustained and controlled release composite material by reactive extrusion, comprising the following steps

[0050] (1) Preparation of methylol urea: add formaldehyde and urea to the reactor, the molar ratio of the two is 1:1.2, then adjust the solution pH=9, react for a certain period of time at 50°C, then freeze the reaction solution, Finally, filter with suction, dry the solid in a vacuum oven, and then pulverize to 70 mesh to obtain methylol urea powder.

[0051] (2) The raw material PBS is dried and pretreated, and then the pretreated PBS and MU are mixed uniformly in a high-speed mixer according to the mass fractions shown in Table 1, to obtain UF / PBS mixtures with different mass ratios.

[0052] (3) Add the above-mentioned UF / PBS mixtures with different mass ratios to a co-rotating twin-screw extruder (L / D=20, Nanjing Coperion Keya Machinery Co., Ltd., TE-20) to extrude, then get The biodegradation sustained and...

Embodiment 1

[0056] The UF30 / PBS70 biodegradable polymer sustained and controlled release composite material prepared by reactive extrusion of the present invention has a tensile strength of 38.7MPa, an average compressive strength of about 101MPa, and a content of nutrient element nitrogen of 83.97mg / g.

Embodiment 2

[0058] The UF50 / PBS50 biodegradable polymer sustained and controlled release composite material prepared by reactive extrusion of the present invention has a tensile strength of 23.8 MPa, an average compressive strength of about 75 MPa, and a content of nutrient element nitrogen of 139.95 mg / g.

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PUM

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Abstract

The invention relates to the field of preparation of biodegradable polymer slow-controlled release composite materials, in particular to a urea-formaldehyde / polybutylene succinate biodegradable polymer slow-control release composite material prepared by reaction extrusion. The method comprises the following steps: uniformly mixing polybutylene succinate and methylol urea powder, and then extruding the mixture in an extruder to obtain a UF / PBS biodegradable polymer containing nutrient element nitrogen for slow and controlled release composite material. As one of the raw materials, methylol urea, the precursor of urea-formaldehyde, undergoes melt polycondensation and retrogeneration in the high temperature of the extruder to generate urea-formaldehyde with different degrees of polymerization, which is dispersed among the PBS macromolecular chains, thereby obtaining the compound of the present invention. Therefore, the performance of the composite material UF / PBS is more excellent, and it can be directly used as a biodegradable polymer slow-release nitrogen fertilizer, or used as a matrix polymer to prepare other types of slow-release fertilizers, and the formula with high PBS content can also replace PBS Preparation of other agricultural products, such as agricultural films, seedling pots, vegetation nets, etc.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer composite materials, in particular to a method for preparing urea-formaldehyde / polybutylene succinate biodegradable polymer slow-controlled release composite materials by reaction extrusion. Background technique [0002] At present, the base polymer of slow and controlled release nitrogen fertilizer is urea formaldehyde (UF). UF is a long-chain polymer that can be degraded by microorganisms, resulting in a slow release of N. However, large-scale preparation of UF particles is usually complicated because it involves reactions in liquid media, and formaldehyde solution, one of the main raw materials, contains about 70 wt% water, which hinders simple, quick, It is prepared by conventional techniques. In addition, the high crystallinity of UF polymers leads to their extremely low nitrogen release rates for practical applications. Unfortunately, UF is thermosetting, has no fixed meltin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C05G3/00C05G3/40C05G5/12C08G12/12
CPCC05C9/02C05G3/00C08G12/12
Inventor 刘亚青张伟赵贵哲范海瑞仝迎芳向阳
Owner ZHONGBEI UNIV
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