Bamboo charcoal reinforced polyurea material and application thereof in packaging of magnetic flux sensor

Abstract

The invention provides a bamboo charcoal reinforced polyurea material and application thereof in packaging of a magnetic flux sensor. The bamboo charcoal reinforced polyurea packaging material is prepared from a component A and a component B. The component A comprises, by weight, 50 parts of polyaspartic acid ester, 55-70 parts of an isocyanate component and 1-2 parts of an auxiliary agent, and the component B comprises, by weight, 1-10 parts of bamboo charcoal. Compared with the prior art, the bamboo charcoal is added into the polyurea packaging material, so that the mechanical property of the composite material is improved, and the structural rigidity, stability, tensile strength and other properties of the polyurea packaging material are remarkably improved; when the coating is coated on the outer surface of the magnetic flux sensor, the corrosion resistance of the magnetic flux sensor can be remarkably improved, the service life of the magnetic flux sensor is prolonged, and the application environment range of the magnetic flux sensor is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a bamboo charcoal reinforced polyurea material and its application in the encapsulation of magnetic flux sensors. Background Art

[0002] Cables and prestressed tendons are important components in bridge structures. It is extremely important to monitor their stress states during construction and operation in a timely manner. The magnetic flux sensor based on the magneto-elastic effect measurement principle can effectively measure the stress of cables and prestressed tendons, and is a new non-destructive testing technology. The design service life of bridge cables is required to be not less than 30 years, and there are high requirements for the anti-corrosion performance of magnetic flux sensors.

[0003] Chinese Patent CN110132456A discloses a polyurea anti-corrosion and explosion-proof magnetic flux sensor, which has a new polyurea anti-corrosion system, can improve the overall anti-corrosion performance and explosion-proof performance of the magnetic flux sensor, extend its service life, expand the application environment range of the magnetic flux sensor, and better overcome the deficiencies of the existing anti-corrosion system of magnetic flux sensors. Among them, the material constituting the polyurea layer is a polyurea material, including a pure polyurea material or a semi-polyurea material.

[0004] Polyurea is an elastomeric substance formed by the reaction of an isocyanate component and an amino compound component, and has certain anti-corrosion performance, but still cannot meet the anti-corrosion requirements of magnetic flux sensors. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a bamboo charcoal reinforced polyurea material and its application in the encapsulation of magnetic flux sensors.

[0006] In a first aspect, the present invention provides a bamboo charcoal reinforced polyurea encapsulation material. The preparation raw materials of the bamboo charcoal reinforced polyurea encapsulation material are composed of component A and component B. By weight, component A includes 50 parts of polyaspartate ester, 55 - 70 parts of isocyanate component, and 1 - 2 parts of auxiliary agent, and component B includes 1 - 10 parts of bamboo charcoal.

[0007] In one embodiment, the bamboo charcoal is silane coupling agent modified bamboo charcoal.

[0008] In one embodiment, the particle size of the bamboo charcoal powder is 3000 - 5000 mesh.

[0009] In one embodiment, component B further includes 1 - 5 parts of plasticizer, and the plasticizer is selected from one or more of nano silicon carbide fibers, silicon carbide whiskers, and silicon carbide powders.

[0010] In one embodiment, the auxiliary agent includes a defoaming agent.

[0011] Second aspect, the present invention provides a preparation method of the bamboo charcoal reinforced polyurea encapsulation material as described above, comprising the following steps:

[0012] Mix the components A in the raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material evenly, and add component B and stir evenly.

[0013] In one embodiment, the preparation method of the silane coupling agent modified bamboo charcoal comprises the following steps:

[0014] Add the silane coupling agent into the alcohol solution, stir evenly to obtain a silane coupling agent hydrolysis solution; add the bamboo charcoal into the silane coupling agent hydrolysis solution, carry out ultrasonic oscillation reaction at room temperature, filter, rinse and dry to obtain the silane coupling agent modified bamboo charcoal.

[0015] In one embodiment, in the silane coupling agent hydrolysis solution, the mass percentage of the silane coupling agent is 2-5%.

[0016] In one embodiment, when adding the bamboo charcoal into the silane coupling agent hydrolysis solution, the mass percentage of the bamboo charcoal is 3-5%.

[0017] Third aspect, the present invention provides an application of the bamboo charcoal reinforced polyurea encapsulation material in the encapsulation of a magnetic flux sensor, using the bamboo charcoal reinforced polyurea encapsulation material as described in any one of the previous ones, or the bamboo charcoal reinforced polyurea encapsulation material is made by the preparation method as described in any one of the previous ones.

[0018] The beneficial effects of the present invention are:

[0019] (1) In the present invention, bamboo charcoal is added to the polyurea encapsulation material. Bamboo charcoal has a large specific surface area and porosity, and stable dimensions, and has a strong interfacial interaction with the polyurea matrix, so that the mechanical properties of the composite material are improved, and the structural stiffness, stability, tensile strength and other properties of the polyurea encapsulation material are significantly improved.

[0020] (2) In the present invention, the bamboo charcoal is modified by a silane coupling agent, which can further enhance the bonding force between the bamboo charcoal and the polyurea, thereby further improving the mechanical properties of the polyurea encapsulation material.

[0021] (3) Coating the bamboo charcoal reinforced polyurea encapsulation material on the outer surface of the magnetic flux sensor can significantly improve the anti-corrosion performance of the magnetic flux sensor, extend the service life of the magnetic flux sensor, and expand its application environment range. Detailed Embodiments

[0022] To further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0023] Specifically, the present invention provides a bamboo charcoal reinforced polyurea encapsulation material. The raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material consist of component A and component B. By weight, component A includes 50 parts of polyaspartate, 55 - 70 parts of isocyanate component, and 1 - 2 parts of auxiliary agent, and component B includes 1 - 10 parts of bamboo charcoal.

[0024] In component A, the isocyanate component can be a monomer, polymer, derivative of isocyanate, prepolymer, and semi - prepolymer, including but not limited to hexamethylene diisocyanate (HDI), dimethyl isocyanate (XDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), etc. The auxiliary agent is an antifoaming agent, which is used to eliminate the foam formed by the materials during the production process. The antifoaming agent is preferably polydimethylsiloxane (PDMS), such as the 6800 silicone antifoaming agent and 5300 modified polysiloxane antifoaming agent of Hemingstone Qian Chemical Co., Ltd.

[0025] Bamboo charcoal has a large surface area and porosity, and its size is stable. It has a strong interfacial interaction with the polymer material matrix. The polymer material flows into the pores of bamboo charcoal to form a firm interfacial interlocking structure, which improves the mechanical properties of the composite material. Since polyurea usually presents in a liquid or paste form, adding bamboo charcoal into polyurea in the present invention can improve the structural rigidity, stability, tensile strength and other properties of polyurea.

[0026] Preferably, the particle size of the bamboo charcoal is 3000 - 5000 mesh. When the particle size of the bamboo charcoal is too large, it is difficult to fully mix the bamboo charcoal with polyurea, resulting in voids inside the encapsulation material, reducing the overall strength of the encapsulation material and making it prone to cracking. When the particle size of the bamboo charcoal is too small, the bamboo charcoal and polyurea are in excessive contact, which will affect the dispersion degree of the bamboo charcoal, leading to stress concentration in the encapsulation material and affecting the overall strength of the encapsulation material. At the same time, the cost of small - particle - size bamboo charcoal is relatively high. Therefore, the present invention limits the particle size of the bamboo charcoal to 3000 - 5000 mesh, which can effectively improve the mechanical properties of the encapsulation material.

[0027] In order to further improve the bonding force between bamboo charcoal and polyurea, the present invention uses a silane coupling agent to modify the bamboo charcoal. This is because the silane oxygroup in the silane coupling agent has reactivity with inorganic substances, and the organic functional group has reactivity or compatibility with organic substances. Therefore, when the silane coupling agent is between the inorganic and organic interfaces, an organic matrix - silane coupling agent - inorganic matrix bonding layer can be formed, thereby increasing the bonding force between the organic matrix and the inorganic matrix.

[0028] Specifically, the raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material include silane coupling agent modified bamboo charcoal. The preparation method of the silane coupling agent modified bamboo charcoal includes the following steps: adding the silane coupling agent into an alcohol solution, stirring evenly to obtain a silane coupling agent hydrolysis solution; adding the bamboo charcoal into the silane coupling agent hydrolysis solution, carrying out ultrasonic oscillation reaction at room temperature, filtering, rinsing, and drying to obtain the silane coupling agent modified bamboo charcoal.

[0029] Preferably, the B component further includes 1 - 5 parts of a plasticizer. Silicon carbide has a high hardness and excellent thermal and chemical stabilities. The plasticizer of the present invention is selected from one or more of nano - silicon carbide fibers, silicon carbide whiskers, and silicon carbide powders.

[0030] Furthermore, the present invention also provides a preparation method of the bamboo charcoal reinforced polyurea encapsulation material, including the following steps: mixing the A component in the raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material evenly, and adding the B component and stirring evenly.

[0031] To further understand the present invention, the following examples are used to illustrate in detail the preparation method of the bamboo charcoal reinforced polyurea encapsulation material provided by the present invention. It is necessary to point out here that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. Some non - essential improvements and adjustments made by those skilled in the art based on the above content of the present invention still fall within the protection scope of the present invention.

[0032] In addition, all raw materials used in the present invention are commercially available products.

[0033] Example 1

[0034] The preparation method of the bamboo charcoal reinforced polyurea encapsulation material in this example includes the following steps:

[0035] Mix 50 parts of polyaspartic ester resin, 55 parts of isocyanate, and 1 part of 6800 organosilicon defoamer evenly; add 5 parts of bamboo charcoal with a particle size of 3000 mesh and stir evenly to obtain the bamboo charcoal reinforced polyurea encapsulation material.

[0036] Example 2

[0037] The preparation method of the bamboo charcoal reinforced polyurea encapsulation material in this example includes the following steps:

[0038] Mix 50 parts of polyaspartic ester resin, 70 parts of isocyanate, and 2 parts of 6800 organosilicon defoamer evenly; add 2 parts of bamboo charcoal with a particle size of 5000 mesh and stir evenly to obtain the bamboo charcoal reinforced polyurea encapsulation material.

[0039] Example 3

[0040] The preparation method of the bamboo charcoal reinforced polyurea encapsulation material in this embodiment includes the following steps:

[0041] Mix 50 parts of polyaspartic acid ester resin, 62 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly; add 10 parts of bamboo charcoal with a particle size of 4000 mesh, and stir evenly to obtain the bamboo charcoal reinforced polyurea encapsulation material.

[0042] Example 4

[0043] The preparation method of the bamboo charcoal reinforced polyurea encapsulation material in this embodiment includes the following steps:

[0044] (1) Prepare an alcohol solution according to the mass ratio of absolute ethanol to water of 8:1. Add the silane coupling agent to the alcohol solution and stir evenly to obtain the silane coupling agent hydrolysis solution. In the hydrolysis solution, the mass percentage of the silane coupling agent is 3%. Add bamboo charcoal with a particle size of 3000 mesh to the silane coupling agent hydrolysis solution, and the mass percentage of the bamboo charcoal is 4%. Ultrasonically oscillate at room temperature for 5 h. Filter out the powder with a sieve, rinse the powder with distilled water, and dry it in an oven at 120 °C for 12 h to obtain the silane coupling agent modified bamboo charcoal.

[0045] (2) Mix 50 parts of polyaspartic acid ester resin, 55 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly; add 5 parts of the silane coupling agent modified bamboo charcoal and stir evenly to obtain the bamboo charcoal reinforced polyurea encapsulation material.

[0046] Example 5

[0047] The preparation method of the bamboo charcoal reinforced polyurea encapsulation material in this embodiment includes the following steps:

[0048] (1) Prepare an alcohol solution according to the mass ratio of absolute ethanol to water of 8:1. Add the silane coupling agent to the alcohol solution and stir evenly to obtain the silane coupling agent hydrolysis solution. In the hydrolysis solution, the mass percentage of the silane coupling agent is 3%. Add bamboo charcoal with a particle size of 3000 mesh to the silane coupling agent hydrolysis solution, and the mass percentage of the bamboo charcoal is 4%. Ultrasonically oscillate at room temperature for 5 h. Filter out the powder with a sieve, rinse the powder with distilled water, and dry it in an oven at 120 °C for 12 h to obtain the silane coupling agent modified bamboo charcoal.

[0049] (2) Mix 50 parts of polyaspartic acid ester resin, 55 - 70 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly; add 5 parts of the silane coupling agent modified bamboo charcoal and 2 parts of nano silicon carbide fiber, and stir evenly to obtain the bamboo charcoal reinforced polyurea encapsulation material.

[0050] Comparative Example 1

[0051] This comparative example provides a method for preparing a polyurea encapsulation material, which includes the following steps:

[0052] Mix 50 parts of polyaspartate resin, 55 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly by stirring to obtain a polyurea encapsulation material.

[0053] Comparative Example 2

[0054] This comparative example provides a method for preparing a bamboo charcoal reinforced polyurea encapsulation material, which includes the following steps:

[0055] Mix 50 parts of polyaspartate resin, 55 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly by stirring; add 5 parts of bamboo charcoal with a particle size of 10,000 mesh and stir evenly to obtain a bamboo charcoal reinforced polyurea encapsulation material.

[0056] Comparative Example 3

[0057] This comparative example provides a method for preparing a bamboo charcoal reinforced polyurea encapsulation material, which includes the following steps:

[0058] Mix 50 parts of polyaspartate resin, 55 parts of isocyanate, and 1 part of 6800 silicone defoamer evenly by stirring; add 5 parts of bamboo charcoal with a particle size of 2000 mesh and stir evenly to obtain a bamboo charcoal reinforced polyurea encapsulation material.

[0059] According to GB / T 23446-2009 "Sprayed Polyurea Waterproof Coating", the tensile strength, abrasion resistance, and impact resistance of the encapsulation materials prepared in Examples 1-5 and Comparative Examples 1-3 were tested, and the test results are shown in Table 1 below.

[0060] Table 1 Performance Evaluation Results

[0061] Tensile strength (MPa) Wear resistance (mg) Impact resistance (kg·m) Example 1 24 35 1.4 Example 2 23 41 1.3 Example 3 25 34 1.5 Example 4 26 32 1.6 Example 5 28 30 1.8 Comparative Example 1 16 50 1 Comparative Example 2 22 40 1.2 Comparative Example 3 10 55 0.8

[0062] As can be seen from Table 1, the encapsulation materials of the examples of the present invention have a tensile strength of more than 23 MPa, a mass loss of abrasion resistance of less than 41 mg, and an impact resistance of more than 1.3 kg·m, and have excellent mechanical properties.

[0063] Compared with Example 1 with the addition of bamboo charcoal, Example 4 with the addition of silane coupling agent modified bamboo charcoal has improved tensile strength, abrasion resistance, and impact resistance, indicating that the bonding force between bamboo charcoal and polyurea is enhanced after the modification of bamboo charcoal with silane coupling agent. Compared with Example 4, Example 5 also added nano silicon carbide fibers, and the tensile strength, abrasion resistance, and impact resistance were all improved, indicating that silicon carbide can further improve the mechanical properties of the encapsulation material.

[0064] Compared with the polyurea encapsulation material without bamboo charcoal (Comparative Example 1), the tensile strength, wear resistance, and impact resistance of Example 1 of the present invention are all improved, indicating that the addition of bamboo charcoal enhances the mechanical properties of the polyurea encapsulation material. In addition, compared with Example 1, the tensile strength, wear resistance, and impact resistance of Comparative Examples 2 and 3 are all decreased, indicating that the particle size of bamboo charcoal affects the mechanical properties of the encapsulation material. The present invention limits the particle size of bamboo charcoal within the range of 3000-5000 mesh, which can effectively improve the mechanical properties of the encapsulation material.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A bamboo charcoal reinforced polyurea encapsulation material, characterized in that, The raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material consist of component A and component B. By weight, component A includes 50 parts of polyaspartate ester, 55 - 70 parts of isocyanate component, and 1 - 2 parts of additives, and component B includes 1 - 10 parts of bamboo charcoal.

2. The bamboo charcoal reinforced polyurea encapsulation material according to claim 1, characterized in that, The bamboo charcoal is silane coupling agent modified bamboo charcoal.

3. The bamboo charcoal reinforced polyurea encapsulation material according to claim 1 or 2, characterized in that, The particle size of the bamboo charcoal powder is 3000 - 5000 mesh.

4. The bamboo charcoal reinforced polyurea encapsulation material according to claim 1 or 2, characterized in that, Component B also includes 1 - 5 parts of plasticizer, and the plasticizer is selected from one or more of nano silicon carbide fiber, silicon carbide whisker, and silicon carbide powder.

5. The bamboo charcoal reinforced polyurea encapsulation material according to claim 1 or 2, characterized in that, The additives include defoaming agent.

6. A preparation method of the bamboo charcoal reinforced polyurea encapsulation material according to any one of claims 1-5, characterized in that, It includes the following steps: Mix component A in the raw materials for preparing the bamboo charcoal reinforced polyurea encapsulation material evenly, and add component B and stir evenly.

7. The preparation method of the bamboo charcoal reinforced polyurea encapsulation material according to claim 6, characterized in that, The preparation method of the silane coupling agent modified bamboo charcoal includes the following steps: Add the silane coupling agent into the alcohol solution, and stir evenly to obtain the silane coupling agent hydrolysis solution; add the bamboo charcoal into the silane coupling agent hydrolysis solution, carry out ultrasonic oscillation reaction at room temperature, filter, rinse, and dry to obtain the silane coupling agent modified bamboo charcoal.

8. The preparation method of the bamboo charcoal reinforced polyurea encapsulation material according to claim 7, characterized in that, In the silane coupling agent hydrolysis solution, the mass percentage of the silane coupling agent is 2 - 5%.

9. The preparation method of the bamboo charcoal reinforced polyurea encapsulation material according to claim 7, characterized in that, When adding the bamboo charcoal into the silane coupling agent hydrolysis solution, the mass percentage of the bamboo charcoal is 3 - 5%.

10. Application of a bamboo charcoal reinforced polyurea encapsulation material in the encapsulation of a magnetic flux sensor, characterized in that, Use the bamboo charcoal reinforced polyurea encapsulation material according to any one of claims 1 - 5, or the bamboo charcoal reinforced polyurea encapsulation material is made by the preparation method according to any one of claims 6 - 9.