阅读说明：本技术 一种丙烯酸丁酯接枝改性汉麻秆芯的制备方法 (Preparation method of butyl acrylate grafted and modified hemp stem core ) 是由 姜振生 于 2020-08-06 设计创作，主要内容包括：本发明所涉及的一种丙烯酸丁酯接枝改性汉麻秆芯的制备方法,先采用碱处理法对汉麻秆芯进行预处理,接着使用丙烯酸丁酯对其进行改性；本发明制备出的丙烯酸丁酯接枝改性汉麻秆芯,亲水性能变弱,结晶度和有序度均增加,改善了与塑料基体的相容性。该制备方法简单,无需高端专业的设备,对温度,压力的要求要求不高,快速节能,成本相对低廉。(The invention relates to a preparation method of butyl acrylate grafted and modified hemp stem cores, which comprises the steps of pretreating hemp stem cores by adopting an alkali treatment method, and then modifying the hemp stem cores by using butyl acrylate; the butyl acrylate grafted and modified hemp stem core prepared by the method has weakened hydrophilic performance, increased crystallinity and order degree, and improved compatibility with a plastic matrix. The preparation method is simple, does not need high-end professional equipment, has low requirements on temperature and pressure, is rapid and energy-saving, and has relatively low cost.)

1. A preparation method of butyl acrylate grafted and modified hemp stem core is characterized by comprising the following steps: placing a certain amount of hemp stalk cores into a sodium hydroxide solution with the concentration of 10% -20%, soaking for 30-40 min, then carrying out vacuum filtration on the processed hemp stalk cores, and washing the hemp stalk cores with distilled water for multiple times until the hemp stalk cores are neutral; transferring the primarily treated hemp stalk cores into a 20-30% dilute hydrochloric acid solution to be soaked for 30min, adding a cerium ammonium nitrate solution with the concentration of 8-10% into the solution to be soaked for 30min, finally injecting a 5-10% butyl acrylate solution, putting the solution into a constant-temperature water bath with the temperature of 40-50 ℃ to react for 4-6 h, washing the generated product to be neutral by using distilled water, drying, washing and precipitating by using absolute ethyl alcohol as a solvent to remove unreacted substances, and putting the product into a drying box with the temperature of 60 ℃ to dry to obtain the modified hemp stalk cores.

Technical Field

The invention belongs to the field of materials. In particular to a preparation method of a butyl acrylate grafted and modified hemp stem core.

Background

As a natural biomass material, compared with carbon fiber and glass fiber, the plant fiber has the advantages of convenient material acquisition, low price, reproducibility, degradability and the like, so that the plant fiber is widely applied to reinforced composite materials. The hemp fiber has high cellulose content and high strength, so the hemp fiber can also be used as a good reinforcing component to prepare a composite material, the hemp fiber has high mechanical properties such as specific strength and specific modulus, and meanwhile, the China hemp yield is at the top of the world, and the hemp fiber has potential industrial application value.

The hemp stalk core is a natural resource which can be obtained in nature, has wide sources, high cost performance and low price, meets the requirements of people on materials, is a renewable resource, and is used as a high polymer filler by many researchers at present. The end surface of the hemp stalk core can be approximately square and hollow, the outer width is generally about 8mm, the inner width is generally about 4mm, and the annular wall thickness is generally about 4 mm. However, hemp stalk cores have the disadvantage of variability in the fibers, requiring surface treatment to improve the mechanical properties of composites made with thermoplastic, thermoset and biodegradable matrices. Therefore, the hemp stalk core is modified to reduce the hydrophilic performance so as to be used as a reinforcing material of a high polymer material in the future and fully play a role.

The roughness and the surface activity of the surface of the modified hemp stalk core are greatly improved, and when the modified hemp stalk core is mechanically coupled with a matrix, the coupling effect is better than that of the fiber which is directly untreated. Generally, the hydrophilicity of the surfaces of the hemp stalk cores is reduced and the hydrophobicity is enhanced through modification, and the hemp stalk cores are prepared into a composite material, so that the mechanical property of the composite material can be enhanced.

According to the invention, the butyl acrylate is used for grafting and modifying the hemp stalk core, and the hydrophilicity and hydrophobicity of the hemp stalk core are adjusted, so that the hemp stalk core can be more easily compounded with plastics.

Disclosure of Invention

The invention aims to perform surface modification design on the hemp stalk cores, and the hemp stalk cores are pretreated by adopting an alkali treatment method and then modified by using butyl acrylate. The method changes the hydrophilicity and hydrophobicity of the hemp stalk core, optimizes the compatibility of the hemp stalk core and the plastic matrix, and has the characteristics of simplifying the production and manufacturing process, reducing the manufacturing cost and improving the utilization rate.

The invention relates to a preparation method of butyl acrylate grafted and modified hemp stem core, which is characterized by comprising the following steps: placing a certain amount of hemp stalk cores into a sodium hydroxide solution with the concentration of 10% -20%, soaking for 30-40 min, then carrying out vacuum filtration on the processed hemp stalk cores, and washing the hemp stalk cores with distilled water for multiple times until the hemp stalk cores are neutral; transferring the primarily treated hemp stalk cores into a 20-30% dilute hydrochloric acid solution to be soaked for 30min, adding a cerium ammonium nitrate solution with the concentration of 8-10% into the solution to be soaked for 30min, finally injecting a 5-10% butyl acrylate solution, putting the solution into a constant-temperature water bath with the temperature of 40-50 ℃ to react for 4-6 h, washing the generated product to be neutral by using distilled water, drying, washing and precipitating by using absolute ethyl alcohol as a solvent to remove unreacted substances, and putting the product into a drying box with the temperature of 60 ℃ to dry to obtain the modified hemp stalk cores.

The invention has the following advantages:

the butyl acrylate grafted and modified hemp stem core prepared by the method has weakened hydrophilic performance, increased crystallinity and order degree, and improved compatibility with a plastic matrix. The preparation method is simple, does not need high-end professional equipment, has low requirements on temperature and pressure, is rapid and energy-saving, and has relatively low cost.

Detailed Description

The present invention is described in further detail below with reference to examples:

example 1

Placing a certain amount of hemp stalk cores in a sodium hydroxide solution with the concentration of 10%, soaking for 30min, then carrying out vacuum filtration on the processed hemp stalk cores, and washing the hemp stalk cores with distilled water for multiple times until the hemp stalk cores are neutral; transferring the primarily treated hemp stalk core into a 20% dilute hydrochloric acid solution to be soaked for 30min, adding a cerium ammonium nitrate solution with the concentration of 8% into the solution to be soaked for 30min, finally injecting a butyl acrylate solution with the concentration of 5%, putting the butyl acrylate solution into a constant-temperature water bath with the temperature of 40 ℃ to react for 4h, washing a generated product to be neutral by using distilled water, drying, washing and precipitating by using absolute ethyl alcohol as a solvent to remove unreacted substances, and putting the product into a drying box with the temperature of 60 ℃ to be dried to obtain the modified hemp stalk core.

Example 2

Putting a certain amount of hemp stalk cores into a sodium hydroxide solution with the concentration of 20%, soaking for 40min, then carrying out vacuum filtration on the processed hemp stalk cores, and washing the hemp stalk cores with distilled water for multiple times until the hemp stalk cores are neutral; transferring the primarily treated hemp stalk cores into a 30% dilute hydrochloric acid solution to be soaked for 30min, adding a 10% ammonium ceric nitrate solution into the solution to be soaked for 30min, finally injecting a 10% butyl acrylate solution, putting the solution into a constant-temperature water bath at 50 ℃ to react for 6h, washing the generated product to be neutral by using distilled water, drying, washing and precipitating by using absolute ethyl alcohol as a solvent to remove unreacted substances, and putting the product into a drying box at 60 ℃ to dry to obtain the modified hemp stalk cores.