Method for preparing temperature/pH sensitive hydrogel by using bamboo dissolving pulp

A sensitive hydrogel and dissolving slurry technology, applied in the field of hydrogel preparation, can solve the problems of expensive raw materials, environmental pollution, non-renewable, etc., and achieve the effect of solving non-renewable and expanding the range of raw materials

Inactive Publication Date: 2016-02-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the problems of serious environmental pollution, expensive raw materials and non-renewable raw materials in the current preparation of hydrogel, and at the same time resource utilization of my country's rich bamboo resources to prepare high value-added renewable new materials, the purpose of the present invention is to provide a Method for preparing temperature / pH sensitive hydrogel using bamboo dissolving pulp

Method used

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  • Method for preparing temperature/pH sensitive hydrogel by using bamboo dissolving pulp
  • Method for preparing temperature/pH sensitive hydrogel by using bamboo dissolving pulp

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Pulverizing the dissolving pulp of moso bamboo with a plant pulverizer, and filtering through a 100-mesh screen to obtain dissolving pulp powder of moso bamboo with a particle size less than or equal to 0.15mm;

[0021] 2) Add the moso bamboo dissolving pulp powder obtained in step 1) into -25°C precooled 5% sodium hydroxide and 13% urea mixed aqueous solution, the mass ratio of the sodium hydroxide and urea mixed aqueous solution to the moso bamboo dissolving pulp powder is 33 : 1, stirring at room temperature for 5min, freezing at -70°C for 90min, obtaining a uniform, transparent moso bamboo dissolving pulp cellulose solution;

[0022] 3) The cellulose solution of moso bamboo dissolving pulp in step 2) was passed through nitrogen for 30 minutes under 60°C water bath and mechanical stirring, 0.1g0.2g / mL ammonium persulfate was added, and 6g of acrylic acid, 2.5g of sodium hydroxide, 1.5 g acrylamide, 1.5g N-isopropylacrylamide and 0.04g0.02g / mLN,N'-methylenebisacryl...

Embodiment 2

[0024] 1) Pulverize the square bamboo dissolving pulp with a plant pulverizer, filter through a 100-mesh sieve, and obtain the square bamboo dissolving pulp powder with a particle diameter less than or equal to 0.15mm;

[0025] 2) The square bamboo dissolving pulp powder obtained in step 1) is added in -25 ℃ precooled 8% sodium hydroxide and 11% urea mixed aqueous solution, the mass ratio of sodium hydroxide and urea mixed aqueous solution and square bamboo dissolving pulp powder 35:1, stirred at room temperature for 5 minutes, and frozen at -70°C for 110 minutes to obtain a uniform and transparent square bamboo dissolving pulp cellulose solution;

[0026] 3) Put the bamboo dissolving pulp cellulose solution in step 2) in a 60°C water bath and under mechanical stirring for 40 minutes, add 0.2g of 0.3g / mL potassium persulfate, add 10g of acrylic acid, 2g of sodium hydroxide, 2g of Acrylamide, 1gN-isopropylacrylamide and 0.05g0.018g / mL polyethylene glycol acrylate were reacted f...

Embodiment 3

[0028] 1) Pulverizing the dissolving bamboo pulp with a plant pulverizer, filtering through a 100-mesh sieve to obtain dissolving bamboo pulp powder with a particle size of less than or equal to 0.15 mm;

[0029] 2) Add the dissolving bamboo pulp powder obtained in step 1) to -25°C precooled 9% sodium hydroxide and 9% urea mixed aqueous solution, the mass ratio of the mixed aqueous solution of sodium hydroxide and urea to the dissolving bamboo pulp powder 40:1, stirred at room temperature for 5 minutes, and frozen at -70°C for 100 minutes to obtain a uniform and transparent bamboo dissolving pulp cellulose solution;

[0030] 3) Put the bamboo dissolving pulp cellulose solution in step 2) in a 60°C water bath and under mechanical stirring for 60 minutes, add 0.3g of 0.1g / mL sodium persulfate, add 8g of acrylic acid, 2g of sodium hydroxide, 2.5 g of acrylamide, 0.5g of N-isopropylacrylamide and 0.08g of 0.01g / mL ethylene glycol dimethacrylate were reacted for 2 hours, taken out,...

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Abstract

The invention discloses a method for preparing a temperature/pH sensitive hydrogel by using bamboo dissolving pulp. The key point of the method is that the method comprises the steps of: carrying out crushing and sieving for pre-treatment of the bamboo dissolving pulp; dissolving the obtained bamboo dissolving pulp powder by using a mixed aqueous solution of sodium hydroxide and urea to obtain a cellulose solution of the bamboo dissolving pulp; and carrying out copolymerization with acrylic acid, acrylamide and N-isopropylacrylamide to obtain the temperature/pH sensitive hydrogel. The method is fast and efficient, and is particularly suitable for a technical process for preparing the temperature/pH sensitive hydrogel by using bamboo cellulose. A bamboo resource is introduced into raw materials for preparing the temperature/pH sensitive hydrogel, so that the supply range of the raw materials of the hydrogel is expanded, and the limitation on the raw material source of the temperature/pH sensitive hydrogel is quickly broken through preferably. Meanwhile, the invention provides an innovative concept for high value utilization of the bamboo source, so that the economic income of farmers in bamboo regions of China can be practically improved, and the method has important practical significance and application value.

Description

technical field [0001] The invention relates to a method for preparing hydrogel, in particular to a method for preparing temperature / pH sensitive hydrogel by using bamboo dissolving pulp, and belongs to the technical field of organic polymer synthesis. Background technique [0002] Hydrogel is a three-dimensional cross-linked hydrophilic network polymer, which can absorb and hold large amounts of water and solutions through physical and chemical actions, and has been widely used in bioengineering, agriculture and many other fields. In view of its high swelling and adsorption of hydrophilic drugs, hydrogels have also been proposed for the construction of drug controlled release systems. [0003] Traditional hydrogels are usually synthesized from petroleum by-products, mainly including copolymers of hydrophilic monomers (such as acrylic acid, acrylamide, etc.). However, petroleum by-products are non-renewable resources, and their non-biodegradability has caused serious harm t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/54C08J3/075
Inventor 张勇周虹伶姚菊明刘虹奕朱杭城
Owner ZHEJIANG SCI-TECH UNIV
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