Thermosensitive film material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of sewage treatment material processing and preparation, and discloses a thermosensitive film material as well as a preparation method and application thereof. The preparation method comprises the following steps: drying a polymeric membrane material to constant weight, and sequentially activating, washing and drying to obtain polymeric powder; and uniformly mixing and stirring the polymer powder and a temperature control reagent, carrying out high-temperature melting modification treatment to obtain a reaction solid, and washing with water to obtain the thermosensitive film material. The novel thermosensitive film material is prepared at a high temperature by adopting a melting modification method, utilizing a caustic soda activation process, taking a polymeric film material as a matrix and taking N-isopropylacrylamide as a temperature control reagent.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment material processing and preparation, and more specifically, relates to a thermosensitive membrane material and a preparation method and application thereof. Background Art

[0002] PVDF membrane materials are widely used in water treatment and bio-separation systems due to their excellent performance. However, membrane materials have specific functions according to their different responses to different stimulus signals from the external environment. In most cases, temperature is an important factor in the membrane separation process, and temperature changes can be easily designed and controlled artificially. Therefore, temperature-sensitive membrane materials are highly valued. Therefore, how to prepare temperature-sensitive ultrafiltration membrane materials in a simple and practical way is a topic worthy of our research and exploration.

[0003] Temperature-sensitive ultrafiltration membrane materials refer to materials that have a sense response to temperature stimulation signals and are reversible within a certain range. Temperature-sensitive ultrafiltration membranes use the characteristics of certain thermosensitive polymers near the lower critical solution temperature, where the molecular chain hydrophilic / hydrophobic balance is destroyed and the chain structure phase is reversibly mutated to adjust the size of the ultrafiltration membrane pores, thereby changing its separation performance, so that the ultrafiltration membrane can sense external temperature changes and make real-time adjustments during use. It is a smart membrane material.

[0004] Therefore, it is urgent to propose a new type of thermosensitive film material and its preparation method and application. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and to propose a thermal-sensitive film material, a preparation method and an application thereof. The present invention adopts a melt modification method, utilizes a caustic soda activation process, uses a polymer film material as a matrix, and uses N-isopropylacrylamide as a temperature control agent to prepare a new thermal-sensitive film material under high temperature conditions.

[0006] In order to achieve the above object, the first aspect of the present invention provides a method for preparing a thermosensitive film material, the preparation method comprising the following steps:

[0007] S1: drying the polymer film material to a constant weight, and sequentially activating, washing and drying the material to obtain a polymer powder;

[0008] S2: mixing the polymer powder and the temperature control reagent uniformly and performing a high-temperature melting modification treatment to obtain a reaction solid, and washing with water to obtain the heat-sensitive film material.

[0009] According to the present invention, preferably, the ratio of the polymer membrane material dried to a constant weight to the temperature control agent is (15-20): (1-5).

[0010] According to the present invention, preferably, the polymer membrane material is polyvinylidene fluoride and / or polytetrafluoroethylene.

[0011] According to the present invention, preferably, the temperature control agent is N-isopropylacrylamide.

[0012] According to the present invention, preferably, the activation treatment comprises: mixing and stirring the polymer membrane material dried to a constant weight with a strong base to obtain the polymer membrane material after the activation treatment.

[0013] According to the present invention, preferably, the strong base is sodium hydroxide and / or potassium hydroxide.

[0014] According to the present invention, preferably, the stirring rate in the activation treatment is 150 rpm-250 rpm.

[0015] According to the present invention, preferably, in step S1, the polymer membrane material is washed with water until the pH value of the activated polymer membrane material is 6.9-7.1.

[0016] According to the present invention, preferably, the equipment used for the high temperature melting modification treatment is a muffle furnace, and the temperature of the high temperature melting modification treatment is 90-120°C.

[0017] The second aspect of the present invention provides a thermosensitive film material prepared by the method for preparing the thermosensitive film material.

[0018] The third aspect of the present invention provides the use of the thermosensitive membrane material in the preparation of a water treatment separation membrane.

[0019] The beneficial effects of the technical solution of the present invention are as follows:

[0020] The invention adopts a melting modification method, utilizes a caustic soda activation process, takes a polymer film material as a matrix, and uses N-isopropylacrylamide as a temperature control agent to prepare a novel heat-sensitive film material under high temperature.

[0021] In the present invention, since N-isopropylpropionamide has an oxygen-containing hanging energy group, it can form hydrogen bonds with water molecules, thereby enhancing the hydrophilicity of the material and improving the hydrophilicity of the thermosensitive film material.

[0022] The preparation process of the invention is simple, continuous, easy to industrialize, convenient to operate and easy to control, saves energy consumption and reduces costs, and the prepared thermosensitive film material can respond to temperature.

[0023] The thermosensitive membrane material of the present invention can be applied to the preparation of water treatment separation membranes.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

[0026] Figure 1 The result graph (“Transmittance” transmittance, “Wave number” wavelength) of infrared functional group detection of the thermosensitive film material of Example 1 according to the test example of the present invention is shown. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] Example 1

[0029] This embodiment provides a method for preparing a thermosensitive film material, the method comprising the following steps:

[0030] S1: drying the polyvinylidene fluoride to constant weight; mixing the polyvinylidene fluoride dried to constant weight with sodium hydroxide and stirring to activate it to obtain activated polyvinylidene fluoride, washing with water to a pH of 7, and drying to constant weight to obtain a polymer powder;

[0031] S2: the polymer powder and N-isopropylacrylamide are mixed and stirred uniformly, and reacted in a muffle furnace at a temperature of 110° C., a reaction solid is obtained by high-temperature melting modification, and the solid is washed with water for 3-5 times to obtain the thermosensitive film material.

[0032] The dosage ratio of polyvinylidene fluoride and N-isopropylacrylamide dried to constant weight is 18:2.

[0033] Test Case

[0034] This test example performs infrared functional group detection on the thermosensitive film material of Example 1. The results are as follows: Figure 1 As shown by Figure 1 It can be seen that polyvinylidene fluoride and N-isopropylacrylamide are combined together to obtain the thermosensitive film material of Example 1.

[0035] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for preparing a heat-sensitive film material, characterized in that: The preparation method comprises the following steps: S1: drying the polymer film material to a constant weight, and sequentially activating, washing and drying the material to obtain a polymer powder; S2: mixing the polymer powder and the temperature control reagent uniformly and performing a high-temperature melting modification treatment to obtain a reaction solid, and washing with water to obtain the heat-sensitive film material.

2. The method for preparing a thermosensitive film material according to claim 1, wherein: The usage ratio of the polymer membrane material dried to constant weight and the temperature control agent is (15-20): (1-5).

3. The method for preparing a thermosensitive film material according to claim 1, wherein: The polymer film material is polyvinylidene fluoride and / or polytetrafluoroethylene.

4. The method for preparing a thermosensitive film material according to claim 1, wherein: The temperature control agent is N-isopropylacrylamide.

5. The method for preparing a thermosensitive film material according to claim 1, wherein: The activation treatment comprises: mixing and stirring the polymer membrane material dried to a constant weight with a strong base to obtain the polymer membrane material after the activation treatment.

6. The method for preparing a thermosensitive film material according to claim 5, wherein: The strong base is sodium hydroxide and / or potassium hydroxide; The stirring rate during the activation treatment is 150 rpm-250 rpm.

7. The method for preparing a thermosensitive film material according to claim 5 or 6, wherein: In step S1, the polymer membrane material is washed with water until the pH value of the activated polymer membrane material is 6.9-7.

1.

8. The method for preparing a thermosensitive film material according to claim 1, wherein: The equipment used for the high temperature melting modification treatment is a muffle furnace, and the temperature of the high temperature melting modification treatment is 90-120°C.

9. The thermosensitive film material prepared by the method for preparing the thermosensitive film material according to any one of claims 1 to 8.

10. Use of the thermosensitive membrane material according to claim 9 in the preparation of a water treatment separation membrane.

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