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Preparation method and application of hemicellulose-based composite temperature-sensitive gel

A composite temperature-sensitive gel and hemicellulose technology, applied in the field of polymer composite modified materials, to achieve good adsorption performance, low environmental friendliness, and easy operation

Inactive Publication Date: 2019-07-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many methods have been developed to remove PCP, such as adsorption, oxidation, microbial degradation, etc. Due to its water solubility, they cannot be effectively removed by the above traditional physical and chemical methods, so adsorption is considered to be a relatively effective removal PCP method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0022] Example 1: The preparation method of PNIPA-co-PA / Hemic modified temperature-sensitive hydrogel, the specific operation is as follows:

[0023] (1) Preparation process of bagasse

[0024] After the bagasse is air-dried, the water content is 3%, the air-dried material is ground, and after being screened through a 40-60 mesh sieve, it is the bagasse powder raw material;

[0025] (2) Processing process of bagasse hemicellulose

[0026] Mix 1.03g of bagasse powder raw material (if the air-dried raw material has a moisture content of 3%, and the dry bagasse raw material is 1 g, then 1 / (100-3)%=1.03 g of bagasse powder raw material), water and sodium hydroxide are mixed and put into the reaction tank During the reaction at 150°C for 90 minutes, the absolute dry bagasse powder was 1.00 g, the amount of water was 5.00 g, and the amount of sodium hydroxide was 0.01 g; Separating the solid and liquid of the reactant with a cloth, pouring absolute ethanol into the filtrate for pr...

Embodiment 2

[0031] Embodiment 2: The preparation method of PNIPA-co-PA / Hemic modified temperature-sensitive hydrogel, the specific operation is as follows:

[0032] (1) Preparation process of bagasse:

[0033] After the bagasse is air-dried, the water content is 15%, the air-dried material is ground, and after being screened through a 100-120 mesh sieve, it is the raw material of bagasse powder;

[0034] (2) Processing process of bagasse hemicellulose:

[0035] Mix 1.18 g of bagasse powder raw material (if the air-dried raw material has a moisture content of 15%, and the dry bagasse powder is 1g, then 1 / (100-15)%=1.18 g of bagasse powder raw material), water, and sodium hydroxide are mixed and put into a reaction tank , reacted at 180°C for 60 minutes, including 1.00 g of dry bagasse powder, 7.00 g of water, and 0.05 g of sodium hydroxide. Separating the solid and liquid of the reactant with a cloth, pouring absolute alcohol into the filtrate for precipitation, using a 0.50 nm membrane ...

Embodiment 3

[0040] Embodiment 3: The preparation method of PNIPA-co-PA / Hemic modified temperature-sensitive hydrogel, the specific operation is as follows:

[0041] (1) Preparation process of bagasse:

[0042] After the bagasse is air-dried, the water content is 30%, the air-dried material is ground, and after being screened through a 180-200 mesh sieve, it is the raw material of bagasse powder;

[0043] (2) Processing process of bagasse hemicellulose:

[0044] Mix 1.43 g of bagasse powder raw material (if the air-dried raw material has a moisture content of 30%, and the dry bagasse powder is 1g, then 1 / (100-30)%=1.43 g of bagasse powder raw material), water, and sodium hydroxide are mixed and put into a reaction tank , reacted at 200°C for 30 minutes, including 1.00 g of dry bagasse powder, 10.00 g of water, and 0.10 g of sodium hydroxide; Separating the solid and liquid of the reactant with a cloth, pouring absolute ethanol into the filtrate for precipitation, using a 0.65 nm membrane...

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Abstract

The invention discloses a preparation method of a hemicellulose-based composite temperature-sensitive gel. The method comprises the following steps: grinding air-dried bagasse, and conducting sievingto obtain a bagasse powder raw material, dissolving out hemicellulose in the bagasse htrough an alkali-assisted hot water extraction method, then, conducting graft copolymerization reaction on N-isopropylacrylamide and propyl acrylate by using an aqueous solution micelle polymerization method, then adding the hemicellulose, carrying out crosslinking on an obtained copolymer and the hemicellulose by using N,N-methylene bisacrylamide, and carrying out cutting, cleaning and cold drying on a product to obtain the poly N-isopropylacrylamide grafted propyl acrylate / hemicellulose temperature-sensitive composite gel. The gel prepared by the method has relatively high adsorption capacity on pentachlorophenol in organic wastewater.

Description

technical field [0001] The invention relates to a method for preparing temperature-sensitive gel by compounding poly(N-isopropylacrylamide) graft-copolymerized propylene acrylate and hemicellulose, and belongs to the technical field of polymer composite modified materials. Background technique [0002] Plant fiber material contains about 15-35% hemicellulose, and most of the hemicellulose is removed in the pulping stage and remains in the waste liquor. The heat value of hemicellulose is 13.6 MJ / kg, which is half of that of lignin. The kraft cooking process in the modern pulp and paper industry usually burns hemicellulose in waste liquor to produce steam for production. This method of treating hemicellulose has not fully exploited the properties of this type of polysaccharide, which is a great waste of resources. At present, fossil resources are almost exhausted, so the effective utilization of natural polymers, such as hemicellulose, is particularly important. Existing me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/54C08F222/38C08F220/18C08B37/14
CPCC08F251/00C08B37/00C08F220/54
Inventor 唐晓宁刘高喆高欣
Owner KUNMING UNIV OF SCI & TECH
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