A method for adjusting the viscosity of natural heat-sensitive polymer aqueous solution

An aqueous solution viscosity and heat-sensitivity technology, applied in the field of adjusting the viscosity of natural heat-sensitive polymer aqueous solutions

Inactive Publication Date: 2017-01-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bibliographical reports are more about the relationship between the following factors and the viscosity of the HPMC aqueous solution. The track and field point out that the viscosity of the HPMC aqueous solution is related to factors such as degree of polymerization, concentration, shear rate, temperature (track and field. Hydroxypropyl methylcellulose aqueous solution viscosity characteristics [J]. Sichuan Military Academy, 2008, 29 (5): 148-149, 158); Jia Xiaohui and others pointed out that the viscosity of HPMC aqueous solution is related to relative molecular mass, degree of substitution, etc. (Jia Xiaohui, Shen Qing. Hydroxypropyl Methyl Cellulose The rheological properties and thermal gelation behavior of [J]. Cellulose Science and Technology, 2008, 16 (3): 48-53.), but there is no detailed study on the adjustment of the viscosity of HPMC aqueous solution by using small molecular weak acids to report

Method used

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  • A method for adjusting the viscosity of natural heat-sensitive polymer aqueous solution
  • A method for adjusting the viscosity of natural heat-sensitive polymer aqueous solution
  • A method for adjusting the viscosity of natural heat-sensitive polymer aqueous solution

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Experimental program
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Embodiment 1

[0023] The steps of this embodiment are as follows:

[0024] (1) Dissolve 18.00g of HPMC powder in 282.00g of deionized water at room temperature, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 6% for subsequent use; dissolve 12.00g of HPMC powder in 288.00 g deionized water, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 4% for testing;

[0025] (2) Weigh 6.48g of AA, add deionized water to 50.00g, stir well, and prepare 1.8mol / L AA solution.

[0026] (3) Weigh 10.00 g of the AA solution in 3 parts (2), adjust the pH to 5, 6, and 7 with NaOH solution, and dilute to 20.00 g with deionized water.

[0027] (4) Take by weighing 10.00g of the solution in (3), and 20.00g of the 6% HPMC solution in (1), and stir evenly to make a mixed solution. In this mixed solution, the concentration of MAA is 0.3mol / L, and the mass fraction of HPMC is 4 %, pH 5, 6, 7, respectively, for te...

Embodiment 2

[0030] (1) Dissolve 18.00g of HPMC powder in 282.00g of deionized water at room temperature, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 6% for subsequent use; dissolve 12.00g of HPMC powder in 288.00 g deionized water, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 4% for testing;

[0031] (2) Weigh 12.91g of MAA, add deionized water to 50.00g, stir well, and prepare 3mol / L MAA solution.

[0032] (3) Weigh 10.00 g of the MAA solution in 3 parts of (2), adjust the pH to 5, 6, and 7 with NaOH solution, and adjust the pH to 20.00 g with deionized water.

[0033] (4) Take by weighing 10.00g of solution in (3) and 20.00g of 6% HPMC solution in (1) respectively, stir well, and make mixed solution, MAA concentration is 0.5mol / L in this mixed solution, and HPMC mass fraction is 4 %, pH 5, 6, 7, respectively, for testing.

[0034] (5) Use Brookfield viscometer to carry out ...

Embodiment 3

[0036] (1) Dissolve 18.00g of HPMC powder in 282.00g of deionized water at room temperature, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 6% for subsequent use; dissolve 12.00g of HPMC powder in 288.00 g deionized water, stir with a magnetic stirrer for 3 to 6 days, and prepare a solution with a mass fraction of HPMC of 4% for testing;

[0037] (2) Weigh 6.30 g of citric acid monohydrate, add deionized water to 50.00 g, and prepare a 0.6 mol / L CA solution.

[0038] (3) Weigh 10.00 g of the CA solution in 3 parts (2), adjust the pH to 5, 6, and 7 with NaOH solution, and dilute to 20.00 g with deionized water.

[0039] (4) Take by weighing 10.00g of the solution in (3) and 20.00g of the 6% HPMC solution in (1) respectively, and stir evenly to prepare a mixed solution. In this mixed solution, the CA concentration is 0.1mol / L, and the HPMC mass fraction is 4 %, pH 5, 6, 7, respectively, for testing.

[0040] (5) Use Brookfiel...

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Abstract

The invention discloses a method for regulating viscosity of a natural heat-sensitive polymer water solution. According to the method, by taking a hydroxypropylmethyl cellulose (HPMC) water solution as an example, small molecular weak acid solutions with different concentrations and different pH values are prepared, and target solutions with different viscosities under different temperatures and different pH conditions can be obtained by mixing the two types of solutions and uniformly stirring. According to the method disclosed by the invention, the way of regulating the viscosity of the HPMC water solution by taking a small molecular weak acid as a means is firstly proposed, and the method has the advantages of convenience in operation and implementation, simplicity and easiness in operation, high controllability and good stability.

Description

technical field [0001] The invention belongs to the field of modification of natural heat-sensitive polymers, and in particular relates to a method for adjusting the viscosity of natural heat-sensitive polymer aqueous solutions. Background technique [0002] Thermosensitive polymers refer to intelligent polymers that can respond to changes in external temperature, and their molecules often contain various functional groups, such as hydrophilic hydroxyl groups, amide groups, hydrophobic alkyl groups, ether bonds, etc. The aqueous solution of this kind of polymer is around a specific temperature, and a slight temperature change can cause a phase transition, and this temperature is the phase transition temperature. Heat-sensitive polymers are divided into natural heat-sensitive polymers and synthetic heat-sensitive polymers, and typical representatives are cellulose, poly(N-isopropylacrylamide), and the like. Among them, hydroxypropyl methylcellulose (HPMC) is a white powder, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/07C08L1/28
Inventor 鲁希华安冬邱高
Owner DONGHUA UNIV
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