Modified glass cellulose / nylon / metallocene composite material and preparation method thereof

Abstract

The invention provides a modified glass cellulose / nylon / metallocene composite material and a preparation method thereof. The method comprises the following steps: S1, modifying the surface of a glass fiber by using silicon dioxide; s2, carrying out surface hydrophobic modification on the glass fibers by adopting a silane reagent; and S3, mixing the modified glass fiber prepared in the step S2 with nylon and metallocene, reacting through a rotational rheometer, and carrying out hot press molding to obtain the modified glass fiber / nylon / metallocene composite material. The glass fiber is subjected to surface modification, so that the interfacial compatibility of the glass fiber, the nylon and the metallocene composite material is enhanced, the strength, rigidity, toughness and other properties of the nylon composite material are improved, and the requirements of the nylon material in different fields are met.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a modified glass cellulose / nylon / metallocene composite material and a preparation method thereof. Background Art

[0002] Polyamide is commonly known as nylon (PA). Its main feature is that it contains a large number of amide groups on the main chain of the polymer. These amide groups are easy to form hydrogen bonds with each other, and the interaction between PA molecular chains is strong. Therefore, PA has the characteristics of high crystallinity, high surface hardness, good chemical stability, high tensile and bending strength, wear resistance, heat resistance, etc., and is widely used in transportation, electronic products and other fields such as automobiles and rails. With the development of science and technology, different products and materials have higher and higher performance requirements for PA. The existing PA can no longer meet the requirements, and it needs to be modified to improve the strength, toughness and rigidity of PA. Glass fiber is currently a more commonly used material for nylon modification, with the advantages of low cost, high strength and high elastic modulus. However, the polarity difference between glass fiber and PA is large, and there is poor interface compatibility during the composite process, which cannot really play the reinforcing effect of glass fiber. It is necessary to surface treat the glass fiber to improve the interface compatibility between the two, thereby improving the tensile strength of PA / glass fiber composite materials. Summary of the invention

[0003] The purpose of the present invention is to provide a modified glass cellulose / nylon / metallocene composite material and a preparation method thereof, to improve the interface compatibility between PA and glass fiber, to enhance the performance of the PA composite material, to further develop and utilize nylon materials, and to expand their application fields.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A method for preparing a modified glass cellulose / nylon / metallocene composite material comprises the following steps:

[0006] S1. dissolving tetraethyl orthosilicate in ethanol, adding glass fiber, mixing and stirring, and then adding ammonia water to load nano-silicon dioxide particles on the surface of the glass fiber through in-situ synthesis;

[0007] S2, dissolving the silane reagent in DMAC, and then adding the glass fiber obtained in step S1 thereto, mixing and stirring to obtain modified glass fiber;

[0008] S3, mixing the modified glass fiber obtained in step S2 with nylon and metallocene, reacting through a rotational rheometer, and hot pressing to obtain a modified glass fiber / nylon / metallocene composite material.

[0009] Further preferably, in step S1, the mass ratio of the nano-silicon dioxide to the glass fiber is 1:20-50.

[0010] Further preferably, in step S2, the silane reagent includes any one of hexadecyltrimethylsilane, octadecyltrichlorosilane, methyltrimethoxysilane and octyltriethoxysilane.

[0011] Further preferably, in step S2, the mass ratio of the silane reagent to the glass fiber is 1:50-100.

[0012] Further preferably, in step S3, the mass ratio of the modified glass fiber, the nylon and the metallocene is 4:16-40:1-2.

[0013] The present invention also provides a modified glass cellulose / nylon / metallocene composite material, wherein the composite material is prepared by the above-mentioned method for preparing the modified glass cellulose / nylon / metallocene composite material.

[0014] In summary, the present invention has the following beneficial effects: the present invention improves the hydrophobicity of glass fiber by surface modification, and enhances the interface compatibility of the composite material of the two. At the same time, metallocene is added to compound with the two materials, further enhancing the toughness of the composite material, so that PA has a wider field. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the effect of modified glass fiber content on the tensile strength of the composites;

[0016] Figure 2 is the effect of modified glass fiber content on the impact strength of the composite material;

[0017] Figure 3 is the effect of modified glass fiber content on the flexural strength of the composites;

[0018] Figure 4 It is the effect of modified glass fiber content on the heat deformation temperature of composite materials. DETAILED DESCRIPTION

[0019] In order to make those skilled in the art better understand the technical scheme of the present invention, the present invention is further described in detail below in conjunction with embodiments. It will be understood by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0020] Example 1

[0021] S1. Weigh 5g of ethyl orthosilicate and dissolve it in 50mL of ethanol. Add 30g of glass fiber and stir it magnetically to mix evenly. Then add ammonia water and drip it in while stirring. React for 1h. Through in-situ synthesis, nano-silica particles are loaded on the surface of the glass fiber. After the reaction, the mass ratio of nano-silica to glass fiber is approximately 1:30. Filter and separate, wash repeatedly with deionized water, and dry.

[0022] S2. Dissolve 1 g of octadecyltrichlorosilane in 50 mL of DMAC solution, add 80 g of the glass fiber obtained in step S1, stir magnetically, react for 24 h, filter and separate, wash with acetone and deionized water, and dry to obtain modified glass fiber.

[0023] S3, take 10g of modified glass fiber, 80g of PA and 5g of metallocene, mix and stir, then add them into a rotational rheometer, react at 120°C for 20min, take them out and pour them into a dumbbell mold, hot press them to obtain a modified glass cellulose / nylon / metallocene composite material.

[0024] Example 2

[0025] S1. Weigh 5g of ethyl orthosilicate and dissolve it in 50mL of ethanol. Add 20g of glass fiber and stir it magnetically to mix evenly. Then add ammonia water and drip it in while stirring. React for 1h. Through in-situ synthesis, nano-silica particles are loaded on the surface of the glass fiber. After the reaction, the mass ratio of nano-silica to glass fiber is approximately 1:20. Filter and separate, wash repeatedly with deionized water, and dry.

[0026] S2. Dissolve 1 g of methyltrimethoxysilane in 50 mL of DMAC solution, add 50 g of the glass fiber obtained in step S1, stir magnetically, react for 24 h, filter and separate, wash with acetone and deionized water, and dry to obtain modified glass fiber.

[0027] S3, take 8g of modified glass fiber, 64g of PA and 2g of metallocene, mix and stir, then add them into a rotational rheometer, react at 120°C for 20min, take out and pour into a dumbbell mold, hot press to obtain a modified glass cellulose / nylon / metallocene composite material.

[0028] Example 3

[0029] S1. Weigh 5g of ethyl orthosilicate and dissolve it in 50mL of ethanol. Add 50g of glass fiber and stir magnetically to mix evenly. Then add ammonia water and drip it in while stirring. React for 1h. Through in-situ synthesis, nano-silica particles are loaded on the surface of the glass fiber. After the reaction, the mass ratio of nano-silica to glass fiber is approximately 1:50. Filter and separate, wash repeatedly with deionized water, and dry.

[0030] S2. Dissolve 1 g of octadecyltrichlorosilane in 50 mL of DMAC solution, add 100 g of the glass fiber obtained in step S1, stir magnetically, react for 24 h, filter and separate, wash with acetone and deionized water, and dry to obtain modified glass fiber.

[0031] S3, take 10g of modified glass fiber, 100g of PA and 4g of metallocene, mix and stir, then add them into a rotational rheometer, react at 120°C for 20min, take them out and pour them into a dumbbell mold, hot press them to obtain a modified glass cellulose / nylon / metallocene composite material.

[0032] Example 4

[0033] S1. Weigh 5g of ethyl orthosilicate and dissolve it in 50mL of ethanol. Add 35g of glass fiber and stir magnetically to mix evenly. Then add ammonia water and drip it in while stirring. React for 1h. Through in-situ synthesis, nano-silica particles are loaded on the surface of the glass fiber. After the reaction, the mass ratio of nano-silica to glass fiber is approximately 1:35. Filter and separate, wash repeatedly with deionized water, and dry.

[0034] S2. Dissolve 1 g of octadecyltrichlorosilane in 50 mL of DMAC solution, add 60 g of the glass fiber obtained in step S1, stir magnetically, react for 24 h, filter and separate, wash with acetone and deionized water, and dry to obtain modified glass fiber.

[0035] S3, take 10g of modified glass fiber, 90g of PA and 3g of metallocene, mix and stir, then add them into a rotational rheometer, react at 120°C for 20min, take out and pour into a dumbbell mold, hot press to obtain a modified glass cellulose / nylon / metallocene composite material.

[0036] Tensile strength: The tensile rate is 50 mm / min. At least 5 specimens without major defects in appearance are selected for testing, and then the average value is calculated to obtain the tensile data. Figure 1 As shown in the figure, the tensile strength of the nylon / metallocene composite material is 78.6MPa. As the amount of modified glass fiber added increases, the tensile strength of the modified glass fiber / nylon / metallocene composite material also increases. When the addition amount is 30%, the tensile strength of the composite material reaches 130.6Mpa. This is because the interface bonding between the modified glass fiber and nylon is enhanced, resulting in an increase in the tensile strength of the composite material.

[0037] Impact strength test: Use an automatic impact tester to test the impact strength of the specimen. The size of the impact specimen is length × width × thickness (80mm × 10mm × 4mm). The notch of the specimen is located in the middle of the specimen, and the notch depth is about 2mm. Test at least 5 specimens of each sample and calculate the average value to obtain its impact strength. Figure 2 As shown in Figure 2, with the increase of modified glass fiber content, the impact strength of modified glass fiber / nylon / metallocene composites is also enhanced. When the addition amount is 30%, the impact strength of the composite material increases from 3.2 kj / m -2 Increased to 11.4 kj / m -2 , has a significant improvement. This is because the modified glass fiber can be better distributed in the composite material, which can effectively prevent the spread of nylon cracks, thereby improving the composite impact strength.

[0038] Bending strength test: the test deflection is 6mm, the span is 64mm, and the bending rate is 2mm / min. Figure 3 As shown in the figure, as the amount of modified glass fiber added increases, the flexural strength of the modified glass fiber / nylon / metallocene composite material increases accordingly. When the amount of modified glass fiber added increases to 30%, the flexural strength of the composite material increases from 86.2MPa to 140.1MPa. This is because the modified glass fiber and nylon have better compatibility, the unit contact surface is increased, the stress transfer of the composite material can be enhanced, deformation is easily generated when subjected to force, and load conduction is improved, so that the flexural strength of the composite material increases with the increase of glass fiber content.

[0039] Thermal deformation temperature test: set the maximum bending deformation to 0.5mm, the heating rate to 120℃ / h, the bending stress to 1.5MPa, and conduct the test after 10min of pretreatment. Figure 4 As shown in the figure, as the content of modified glass fiber in the modified glass fiber / nylon / metallocene composite material increases, the heat deformation temperature of the composite material also increases, from 45.3°C to 110.5°C. This is because the addition of modified glass fiber will increase the crystallinity of the composite, thereby improving the heat resistance of the composite.

[0040] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preparing a modified glass cellulose / nylon / metallocene composite material, characterized in that: The following steps are involved: S1. dissolving tetraethyl orthosilicate in ethanol, adding glass fiber, mixing and stirring, and then adding ammonia water to load nano-silicon dioxide particles on the surface of the glass fiber through in-situ synthesis; S2, dissolving the silane reagent in DMAC, and then adding the glass fiber obtained in step S1 thereto, mixing and stirring to obtain modified glass fiber; S3, mixing the modified glass fiber obtained in step S2 with nylon and metallocene, reacting through a rotational rheometer, and hot pressing to obtain a modified glass fiber / nylon / metallocene composite material.

2. The method for preparing a modified glass cellulose / nylon / metallocene composite material according to claim 1, characterized in that: In step S1, the mass ratio of the nano-silicon dioxide to the glass fiber is 1:20-50.

3. The method for preparing a modified glass cellulose / nylon / metallocene composite material according to claim 1, characterized in that: In step S2, the silane reagent includes any one of hexadecyltrimethylsilane, octadecyltrichlorosilane, methyltrimethoxysilane and octyltriethoxysilane.

4. The method for preparing a modified glass cellulose / nylon / metallocene composite material according to claim 1, characterized in that: In step S2, the mass ratio of the silane reagent to the glass fiber is 1:50-100.

5. The method for preparing a modified glass cellulose / nylon / metallocene composite material according to claim 1, characterized in that: In step S3, the mass ratio of the modified glass fiber, the nylon and the metallocene is 4:16-40:1-2.

6. A modified glass cellulose / nylon / metallocene composite material, characterized in that: The composite material is prepared by the method for preparing a modified glass cellulose / nylon / metallocene composite material according to any one of claims 1 to 5.

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