Super-hydrophobic modifier for thermosetting waste powder and modification method based on super-hydrophobic modifier

Abstract

The invention relates to the technical field of resin modification, in particular to a super-hydrophobic modifier for thermosetting waste powder and a modification method based on the super-hydrophobic modifier. The raw materials comprise the following components in parts by weight: 1-3 parts of an anionic surfactant, 1-3 parts of a silane coupling agent, 0.5-4 parts of trichlorosilane, 1-5 parts of a phthalate coupling agent, 60-90 parts of water and 20-60 parts of ethanol. The silane coupling agent, the trichlorosilane and the phthalate coupling agent are matched with one another, and meanwhile, the hydrophobic property of the powder material can be remarkably improved by matching with a water-ethanol solvent system.

Description

Technical Field

[0001] The invention relates to the technical field of resin modification, and in particular to a super-hydrophobic modifier for thermosetting waste powder and a modification method based thereon. Background Art

[0002] Industrial waste thermosetting composite materials can be converted into powders through physical methods. However, the hydrophobic properties of the powders after direct crushing are poor and cannot meet the requirements of super-hydrophobic performance. This is because in order to enhance the performance of thermosetting resins, manufacturers of related electronics, auto parts, and electrical appliances usually use materials such as calcium carbonate, silica, and glass fiber as reinforcing fillers. The proportion of the above-mentioned reinforcing fillers can reach more than 60%, thereby meeting the requirements for composite material performance. Due to the addition of the above-mentioned reinforcing fillers, the surface of the powder prepared by the physical crushing method will have a multi-phase structure, resulting in reduced hydrophobic properties.

[0003] Most of the existing technologies for preparing super-hydrophobic powders are based on modifying the surface of a single material with a single-phase structure, and there are limitations in the super-hydrophobic interface modification of the above-mentioned multi-phase structure products. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems and provide a super hydrophobic modifier for thermosetting waste powder and a modification method based thereon. To achieve the above purpose, the present invention adopts the following technical scheme:

[0005] A super-hydrophobic modifier for thermosetting waste powder, comprising the following parts in parts by weight:

[0006] 1-3 parts of anionic surfactant, 1-3 parts of silane coupling agent, 0.5-4 parts of trichlorosilane, 1-5 parts of phthalate coupling agent, 60-90 parts of water and 20-60 parts of ethanol.

[0007] As an improvement, the following components are included in parts by weight:

[0008] 2 parts of anionic surfactant, 2 parts of silane coupling agent, 1 part of trichlorosilane, 3 parts of phthalate coupling agent, 60 parts of water and 40 parts of ethanol.

[0009] As an improvement, the silane coupling agent and the phthalate coupling agent are long alkyl chain coupling agents.

[0010] The present invention also discloses a method for super-hydrophobic modification of thermosetting waste powder, comprising the following steps:

[0011] S1. Crushing

[0012] Crushing of thermosetting waste;

[0013] S2. Modification agent

[0014] Anionic surfactant, silane coupling agent, trichlorosilane and phthalate coupling agent are compounded in proportion, and then dissolved in a mixed solution of water and ethanol;

[0015] S3. Mixing

[0016] Add the modifier to the powder obtained in S1, and then use a screw barrel machine to stir and mix for modification;

[0017] S4. Collect and pack

[0018] After stirring, the modified powder is packaged.

[0019] As an improvement, the thermosetting waste in step S1 is crushed to 20-600 mesh.

[0020] As an improvement, the ratio of the powder to the modifier in step S3 is 5-40:1.

[0021] The advantages of the present invention are:

[0022] 1. The present invention prepares a new surface modifier based on the characteristics of the multiphase structure of the surface of the thermosetting composite material powder of industrial waste. The present invention can effectively overcome the problem of different surface properties of the powder material, thereby preparing a powder material with a super-hydrophobic surface. The present invention uses an amphiphilic solution system for solvent matching to increase the reactivity of the surface modifier, which can reduce the amount of surface modifier used.

[0023] 2. The present invention uses water and ethanol as solvents, both of which are environmentally friendly and can significantly reduce environmental pollution during industrial production. The combination of water and ethanol not only ensures the solubility and stability of the modifier, but also protects the ecological environment.

[0024] 3. The present invention uses anionic surfactants, which can synergistically increase the affinity of the solution to the powder, effectively improve the modification efficiency, and reduce the amount of the modifier used, thereby achieving the purpose of saving production costs.

[0025] 4. The present invention uses silane coupling agent, trichlorosilane and phthalate coupling agent to mix with each other, which significantly improves the hydrophobicity of the powder material. DETAILED DESCRIPTION

[0026] The present invention is described in detail and specifically by specific examples below to provide a better understanding of the present invention, but the following examples do not limit the protection scope of the present invention.

[0027] Example 1

[0028] This embodiment discloses a super-hydrophobic modifier for thermosetting waste powder, the raw materials of which include the following components:

[0029] 2kg of anionic surfactant, 2kg of silane coupling agent, 1kg of trichlorosilane, 3kg of phthalate coupling agent, 60kg of water and 40kg of ethanol.

[0030] The method for super-hydrophobic modification of thermosetting waste powder using the present invention comprises the following steps:

[0031] S1. Crushing

[0032] The thermosetting waste is crushed to 20-600 mesh; if the particle size is less than 20 mesh, it is sieved and crushed again.

[0033] S2. Modification agent

[0034] Anionic surfactant, silane coupling agent, trichlorosilane and phthalate coupling agent are compounded in proportion, and then dissolved in a mixed solution of water and ethanol;

[0035] S3. Mixing

[0036] Add the modifier to the powder obtained in S1, and then use a screw barrel machine to stir and mix for modification;

[0037] The ratio of the powder to the modifier in step S3 is 5-40:1.

[0038] The present invention also provides a plurality of embodiments and comparative examples of modifiers, and the raw material ratios thereof are shown in Table 1. The thermosetting powders were subjected to hydrophobic modification treatment under the same processing conditions using the embodiments and comparative examples, and the results are shown in Table 2.

[0039] Table 1 Raw material composition of the modifier in each embodiment and comparative example

[0040]

[0041] Table 2 Performance of the modified products of each embodiment and comparative example

[0042]

[0043] The contact angle of the untreated thermosetting waste powder is 96.3°.

[0044] Comparison of Comparative Examples 1 and 2 with the unmodified thermosetting waste powder shows that the addition of ethanol and surfactant can effectively improve the binding effect of silane coupling agent, trichlorosilane, phthalate coupling agent and powder, and improve the hydrophobicity of the modified powder.

[0045] Comparing Examples 1-4 and Examples 6-8, it can be seen that when there are only two modifying components, the contact angle of the thermosetting waste powder is only about 120°-130°. After compounding with three modifying components at the same time, the contact angle can be increased to more than 150°, greatly improving the hydrophobicity of the material. In addition, the amount of ethanol plays an important role in the modification of the material. The reason why the contact angle of Example 4 is smaller is because the amount of ethanol is insufficient.

[0046] In summary, the present invention uses silane coupling agent, trichlorosilane and phthalate coupling agent to match each other, and at the same time uses a water-ethanol solvent system to significantly improve the hydrophobicity of the powder material.

[0047] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A super-hydrophobic modifier for thermosetting waste powder, characterized in that: The following parts are included by weight: 1-3 parts of anionic surfactant, 1-3 parts of silane coupling agent, 0.5-4 parts of trichlorosilane, 1-5 parts of phthalate coupling agent, 60-90 parts of water and 20-60 parts of ethanol.

2. A super-hydrophobic modifier for thermosetting waste powder according to claim 1, characterized in that: The following components are included in parts by weight: 2 parts of anionic surfactant, 2 parts of silane coupling agent, 1 part of trichlorosilane, 3 parts of phthalate coupling agent, 60 parts of water and 40 parts of ethanol.

3. The super-hydrophobic modifier for thermosetting waste powder according to claim 1, characterized in that: The silane coupling agent and the phthalate coupling agent are long alkyl chain coupling agents.

4. A method for super-hydrophobic modification of thermosetting waste using the modifier according to claim 1, characterized in that: The steps include: S1. Crushing Crushing of thermosetting waste; S2. Modification agent Anionic surfactant, silane coupling agent, trichlorosilane and phthalate coupling agent are compounded in proportion, and then dissolved in a mixed solution of water and ethanol; S3. Mixing and stirring Add the modifier to the powder obtained in S1, and then use a screw barrel machine to stir and mix for modification; S4. Collect and pack After stirring, the modified powder is packaged.

5. The method for super-hydrophobic modification of thermosetting waste powder according to claim 4, characterized in that: In step S1, the thermosetting waste is crushed to 20-600 mesh.

6. The method for super-hydrophobic modification of thermosetting waste powder according to claim 4, characterized in that: The ratio of the powder to the modifier in step S3 is 5-40:1.

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