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Degradable composite material containing tea powder and its preparation method and application

A technology of composite materials and tea powder, which is applied in the field of composite materials, can solve problems such as industrial overcapacity, imbalance between production and sales, and waste of functions, and achieve the effect of low production energy consumption and low energy consumption

Active Publication Date: 2020-04-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first problem is the overcapacity of the industry: in 2015, my country's total tea output was about 2.3 million tons, of which about 300,000 tons of tea were not consumed, and there was an obvious imbalance between production and sales
The second problem is functional waste: currently only about 30% of the fresh leaves of tea in our country are picked and utilized, and about 70% of the fresh leaves are not picked due to various reasons
[0004] At present, there is no relevant technology to convert tea dregs raw materials into biodegradable industrially produced materials. The technical limitations mainly lie in the degradability of the adhesive that plays a role in forming and curing, and the adhesiveness of the adhesive to tea raw materials. The effect of odor release

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] When inspecting different glycerin additions, the compactness effect of the obtained composite materials

[0040] Take 5 groups of 10g starch and disperse them in 60ml of water, add 5ml of 5% acetic acid solution to each group, add 5ml, 4ml, 3ml, 2ml and 1ml of glycerol respectively. Heat and stir the 5 groups of mixtures until translucent jelly, add 50g of tea powder (tea dregs, tea granules) respectively, mix well, pour into the mold and press tightly. Put the mold into a constant temperature oven at 65 degrees Celsius to dry for 2 hours, take out the semi-dried mixture from the mold, and continue to put it into the oven to dry. The properties of the five groups of composite materials were observed respectively.

[0041] The results show that the hardness of the obtained composite material increases with the decrease of the amount of glycerin, and the degree of dryness increases with the decrease of the amount of glycerin. At the same time, considering the compactness ...

Embodiment 2

[0043] Influence of compounding ratio of tea powder and adhesive on the mechanical strength of composite materials

[0044] Grind 300g of tea leaves or tea dregs into powder, and divide them into three groups of 100g each. Take 15g, 20g and 50g of starch respectively to prepare three kinds of adhesives.

[0045] The preparation process of the first adhesive is as follows: 15g of vegetable starch, 7.5ml of 5% acetic acid solution and 4.5ml of glycerin (glycerol) are mixed in 90ml of water, heated and stirred for 5min until boiling. The obtained translucent jelly substance is a biopolymer adhesive.

[0046] The preparation process of the second adhesive is as follows: 20 g of vegetable starch, 10 ml of 5% acetic acid solution and 6 ml of glycerin (glycerol) are mixed in 120 ml of water, heated and stirred for 5 minutes until boiling. The obtained translucent jelly substance is a biopolymer adhesive.

[0047] The preparation process of the third adhesive is as follows: 50 g of...

Embodiment 3

[0052] Effect of tea powder particle size on surface cracks and mechanical strength of composite materials

[0053] The tea leaves and tea dregs are crushed, and granules or powders with diameters of 2mm, 1mm, 0.5mm, and 0.1mm are screened out. Take 25g of each of the above-mentioned granules or powders, mix and stir evenly with the adhesive prepared from 5g of starch, pour it into a square mold with a size of about 5mm*5mm*2.5mm and compact it. Take it out after drying at a constant temperature of 65 degrees Celsius. Among the obtained materials, the material with a particle size of 0.1 mm has the least surface cracks, the highest mechanical strength and the best surface texture. The optimal tea powder particle diameter thus obtained is 0.1mm.

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Abstract

The invention relates to a tea powder-containing degradable composite material and a preparation method and an application thereof. The method comprises the following steps: tea powder, lignin fiber,a starch-modified adhesive are mixed with a weight ratio being 4:1:1, a plastic tea clay material is obtained, the tea clay material is dehydrated and moulded to obtain a sheet material and a sectional material based on the degradable composite material, or can be directly processed to a product; wherein the preparation method of the starch-modified adhesive comprises the following steps: mixing plant starch, an acetic acid solution with concentration being 5% and glycerin in water, and heating a mixture while stirring to a boiling state to obtain a semi-transparent gelatinoid which is the starch-modified adhesive; wherein a proportion relation of the plant starch, the acetic acid solution, glycerin and water is 10 g: 5 ml: 3 ml: 60 ml. The biodegradable adhesive solves the problem of existence of other adhesives, and the prepared bio composite material is biodegradable, has tea fiber adsorptivity and smell slow releasing effect which accord with an industrial production standard, andis environmentally friendly and sustainable.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a degradable composite material containing tea powder, a preparation method and application thereof. Background technique [0002] The preparation method of the degradable composite bio-based material is to mix the treated biomass raw material with a degradable adhesive to prepare a composite material whose molding mode and mechanical strength meet the industrial production standard. [0003] China is a big tea producing country in the world. In 2016, the area of ​​Chinese tea gardens was 2.87 million hectares, with an output of more than 2.4 million tons, the largest planting scale in the world, and a consumption of more than 2 million tons. These numbers are still growing over time. Behind the ever-growing tea industry, there is a huge waste of resources. According to the former director of the Hangzhou Tea Research Institute of the All-China Federation of Supply a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L99/00C08L3/04C08L97/02
CPCC08L99/00C08L2201/06C08L2205/03C08L2205/16C08L3/04C08L97/02
Inventor 任丽莎周季玮
Owner TONGJI UNIV
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