a biodegradable adhesive

A biodegradable, adhesive technology, applied in the direction of adhesives, adhesive additives, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of poor permeability, low survival rate, easily broken and damaged roots, etc.

Active Publication Date: 2019-01-04
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical transplanting can ensure the plant spacing, row spacing and depth of transplanting; transplanting technology can improve the disaster resistance and stress resistance of crop growth, ensure stable crop production and improve product quality; mechanized transplanting is the trend of modern agricultural development, and some crops The packing type is poor, and the mechanized transplanting process will cause the substrate to scatter and the root system to be damaged, thus prolonging the slow seedling period
[0003] At present, the matrix block is basically made of soil as the main raw material, which is compressed and formed in the mold, and the soil lump is used to raise seedlings, which is pressed from relatively viscous soil, which has poor permeability and low survival rate. easily broken roots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of embodiment 1 biodegradable adhesive

[0031] 1. Preparation of hydrolyzed protein:

[0032] The protein used in the examples is zein, and the manufacturer is Shandong Shouguang Juneng Golden Corn Development Co., Ltd.

[0033] Prepare a mixed aqueous solution of potassium hydroxide with a final concentration of 1mol / L urea and 0.01mol / L, heat it to 95°C, add zein to it, heat and stir for 1 hour, then naturally cool and discharge the material to obtain a hydrolyzed solution with a solid content of 15%. protein.

[0034] 2. Preparation of hydrolyzed protein-urea-formaldehyde copolymer:

[0035] Add formaldehyde into the reaction kettle, adjust the pH to 7.2 with an alkaline solution (20% potassium hydroxide solution) (during the specific operation, the pH range can be selected between 7.0-7.5); add the first Urea (the quality is 70% of the total amount of urea added) and hydrolyzed protein, stop heating when the temperature is raised to 50 ° C, when ...

Embodiment 2

[0040] The preparation of embodiment 2 biodegradable adhesives

[0041](a) Preparation of hydrolyzed protein: Prepare a mixed aqueous solution with a final concentration of 2mol / L urea and 0.01mol / L potassium hydroxide, heat to 90°C, add soybean protein isolate, stir for 1 hour, then naturally cool and discharge to obtain a solid content 12% hydrolyzed protein.

[0042] (b) Preparation of hydrolyzed protein-urea-formaldehyde copolymer: formaldehyde is added in the reactor, with alkaline solution (mass fraction is the dipotassium hydrogen phosphate of 20% and the mass fraction is the potassium hydroxide equivolume mixed solution of 20%) ) to adjust the pH to 7.0; add urea for the first time (the quality is 75% of the total mass of urea) and the hydrolyzed protein obtained in step (a), stop heating after the temperature is raised to 50 ° C, and when the temperature no longer continues to rise, then Heat up to 90°C and keep warm at this temperature for half an hour;

[0043] Us...

Embodiment 3

[0045] The preparation of embodiment 3 biodegradable adhesives

[0046] (a) Preparation of hydrolyzed protein: Prepare a mixed aqueous solution with a final concentration of 2mol / L urea and 0.02mol / L potassium hydroxide, heat to 90°C, add a mixture of soybean protein isolate and corn protein (mass ratio 1:1) , stirred for 1 h, then cooled and discharged to obtain hydrolyzed protein with a solid content of 15%.

[0047] (b) Preparation of hydrolyzed protein-urea-formaldehyde copolymer: formaldehyde is added in the reactor, adjust pH=7.0 with alkaline solution (mass fraction is the potassium hydroxide solution of 25%); Add urea for the first time (being urea 75% of the total mass) and the hydrolyzed protein obtained in step (a), the temperature is raised to 50°C to stop heating, and when the temperature does not continue to rise, the temperature is raised to 90°C, and the temperature is kept at this temperature for half an hour;

[0048] Adjust the pH to 4.7 with an acidic solu...

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Abstract

The invention discloses a biodegradable adhesive prepared by copolymerizing protolysate and urea and formaldehyde. In a preparation process of the adhesive, the bonding strength between the bonding material and a seedling culture substrate as well as the nutrient release speed can be controlled by controlling the urea-formaldehyde molar ratio and the hydrolysis degree and addition amount of the protolysate in the copolymerizing process; the adhesive can be used for bonding and moulding the seedling culture substrate to avoid scattering and root injury of the seedlings in a mechanical transplanting process; and after being compounded with the substrate, the adhesive can be degraded to provide nutrients during the seedling growth and also can serve as a coating slow-release material of nutrient elements to promote the seedling growth.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a biodegradable adhesive. Background technique [0002] With the advancement of my country's agricultural modernization and the transfer of agricultural population, there is an urgent need for high-efficiency, universal, and low-cost automatic transplanting machines for plug seedlings in monotonous and heavy transplanting operations. Mechanical transplanting can ensure the plant spacing, row spacing and depth of transplanting; transplanting technology can improve the disaster resistance and stress resistance of crop growth, ensure stable crop production and improve product quality; mechanized transplanting is the trend of modern agricultural development, and some crops The packing type is poor, and the mechanized transplanting process will cause the matrix to scatter and the root system to be damaged, thereby prolonging the slow seedling period. [0003] At present, the matrix ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C09J161/32C09J11/04C05G1/00A01G24/10A01G24/30
CPCA01G24/00C05C5/00C05C9/02C08G12/40C08K3/06C08K3/16C08K3/22C08K3/24C08K3/28C08K3/30C08K3/38C08K2003/168C08K2003/2248C08K2003/2262C08K2003/287C08K2003/3045C08K2003/387C09J11/04C09J161/32C05C5/04C05D9/00C05D9/02C05D3/00C05D5/00
Inventor 曲萍夏礼如蒋希芝徐磊赵永富
Owner JIANGSU ACAD OF AGRI SCI
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