A preparation method and application of a polyboron-siloxane-based damping material

Abstract

This invention discloses a method for preparing a polyborosiloxane damping material, comprising the following steps: (1) taking polyborosiloxane, heating and dissolving it in hydroxyl silicone oil, and stirring evenly to obtain a polyborosiloxane solution; (2) taking the polyborosiloxane solution obtained in step (1), adding ultrafine calcium carbonate and diatomaceous earth, and stirring evenly; (3) taking the sample obtained in step (2), adding oleophilic silica (SiO2) as filler, and stirring evenly to obtain the polyborosiloxane damping material. The polyborosiloxane damping material prepared by the above method has excellent viscosity-temperature properties and good flow properties; and is non-toxic and harmless in the preparation process.

Description

Technical Field

[0001] This invention belongs to the field of damping material technology, specifically relating to a preparation method and application of a polyboron-siloxane-based damping material. Background Technology

[0002] Viscous dampers are typically used in environments with temperatures ranging from -25°C to 50°C, which is a large temperature range. Therefore, the damping medium material used to fill them must have relatively stable viscosity and minimal variation within this temperature range.

[0003] Currently, silicone oil is commonly used as the damping medium, and its viscosity at -40℃ is 7 to 11 times that at 25℃, but this still cannot meet the requirements. The bond energy of the Si-O bond in polyborosiloxane is 422.5 kJ / mol, the bond energy of the C-C bond is 368 kJ / mol, while the bond energy of the BO bond formed after incorporating B atoms is 537.6 kJ / mol. This means that the Si-OB bond has a higher bond energy than the Si-O-Si bond by 115.1 kJ / mol. Furthermore, the introduction of B atoms results in p-π and d-π conjugation in the polymer structure, and the glass transition temperature range of polyborosiloxane is -118℃ to -105℃, giving it good high and low temperature viscosity stability.

[0004] Therefore, this invention proposes a polyboron-siloxane-alkyl damping material with good viscosity-temperature effect. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a polyboron-siloxane damping material with excellent viscosity-temperature properties and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a method for preparing a polyboron-siloxane-based damping material, comprising the following steps:

[0008] (1) Take polyborosiloxane, heat it to dissolve it in hydroxy silicone oil, and stir it evenly to obtain a polyborosiloxane solution;

[0009] (2) Take the polyborosiloxane solution obtained in step (1), add ultrafine calcium carbonate and diatomaceous earth, and stir evenly;

[0010] (3) Take the sample obtained in step (2), add oleophilic silica (SiO2) filler, and stir evenly to obtain polyborosilicate damping material.

[0011] Furthermore, the silicon-to-boron ratio of the polyborosiloxane described in step (1) is 1:1.

[0012] Furthermore, the molecular weight of the hydroxyl silicone oil mentioned in step (1) is 5000 mol.

[0013] Furthermore, the dissolution temperature mentioned in step (1) is 60°C.

[0014] Furthermore, the mass ratio of polyborosiloxane to hydroxyl silicone oil in step (1) is 100:6.

[0015] Furthermore, the ultrafine calcium carbonate mentioned in step (2): XM302, Shanghai Dayu Biochemical Co., Ltd.

[0016] Furthermore, the mass ratio of the ultrafine calcium carbonate to the polyborosiloxane solution in step (2) is 1:10.

[0017] Furthermore, the diatomite mentioned in step (2): 499, Linjiang Serite Diatomite Co., Ltd.

[0018] Furthermore, the mass ratio of diatomaceous earth to polyborosiloxane solution in step (2) is 1:10.

[0019] Furthermore, the silicon dioxide grade mentioned in step (3) is... H30, with a specific surface area of ​​250m² 2 / g.

[0020] Furthermore, the mass ratio of the sample to SiO2 in step (3) is 100:1 to 100:8.

[0021] Application of the polyboron-siloxane-alkyl damping material prepared by the above method in viscous dampers.

[0022] Since the polyborosiloxane solution obtained after being dissolved by hydroxyl silicone oil has low viscosity and weak damping performance, ultrafine calcium carbonate, diatomaceous earth, and silica are added to the polyborosiloxane solution to increase its viscosity, thereby improving its damping performance and thus enhancing its vibration reduction capability when applied to dampers.

[0023] Since viscous dampers require good fluidity of the damping medium, if the added silica content is too high, the viscosity of the material will be too high, making it difficult for the piston rod to move, and thus failing to meet the requirements for the use of the damper. Therefore, the amount of silica added must be limited.

[0024] Compared with existing technologies, the polyborosiloxane damping material of this invention is a polymer material based on dynamic non-covalent "BO bonds," exhibiting viscoelasticity and excellent damping performance. The dynamic non-covalent "BO bonds" are in a dynamic process of continuous dissociation and reformation under stress, continuously consuming energy during this process to achieve a damping effect. Furthermore, the Si-OB bonds in the polyborosiloxane chain have large bond angles and bond energies, high orientation freedom, and good flexibility. Therefore, the polyborosiloxane damping material prepared by this invention has excellent viscosity-temperature properties and good flow properties; moreover, the preparation process is non-toxic and harmless. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments.

[0026] Example 1:

[0027] A method for preparing a polyboron-siloxane-based damping material includes the following steps:

[0028] (1) Take 100g of polyborosiloxane and 6g of hydroxyl silicone oil and dissolve them in an oven at 60℃. After dissolution, stir evenly with a mechanical stirrer.

[0029] (2) Take 100g of the sample obtained in step (1), add 10g of ultrafine calcium carbonate and 10g of diatomaceous earth, and stir evenly.

[0030] (3) Take 100g of the sample obtained in step (2), add 1g of oleophilic silica filler, and stir evenly to obtain polyboron siloxane damping material.

[0031] Example 2:

[0032] A method for preparing a polyboron-siloxane-based damping material includes the following steps:

[0033] (1) Take 100g of polyborosiloxane and 6g of hydroxyl silicone oil and dissolve them in an oven at 60℃. After dissolution, stir evenly with a mechanical stirrer.

[0034] (2) Take 100g of the sample obtained in step (1), add 10g of ultrafine calcium carbonate and 10g of diatomaceous earth, and stir evenly.

[0035] (3) Take 100g of the sample obtained in step (2), add 4g of oleophilic silica filler, and stir evenly to obtain polyboron siloxane damping material.

[0036] Example 3

[0037] A method for preparing a polyboron-siloxane-based damping material includes the following steps:

[0038] (1) Take 100g of polyborosiloxane and 6g of hydroxyl silicone oil and dissolve them in an oven at 60℃. After dissolution, stir evenly with a mechanical stirrer.

[0039] (2) Take 100g of the sample obtained in step (1), add 10g of ultrafine calcium carbonate and 10g of diatomaceous earth, and stir evenly.

[0040] (3) Take 100g of the sample obtained in step (2), add 8g of oleophilic silica filler, and stir evenly to obtain polyboron siloxane damping material.

[0041] Comparative example

[0042] Wacker damping silicone oil with grade AK1000000 was used as a comparative example.

[0043] in conclusion

[0044] The polyborosilicate damping material prepared in the implementation case was subjected to shear viscosity-shear rate testing using a rotational rheometer. Table 1 shows the viscosity data of the prepared polyborosilicate damping material and the control sample at different temperatures, as well as the viscosity change factors between -40℃ and 25℃.

[0045] Table 1. Comparison of viscosity of polyboron-siloxane-based damping materials at different temperatures

[0046]

[0047] As shown in the table, the damping material prepared using polyborosiloxane has excellent viscosity-temperature properties, with the viscosity difference between low and high temperatures being only 2 times, and the viscosity-temperature properties of each sample are better than those of the control sample.

Claims

1. A method for preparing a polyboron-siloxane-based damping material, characterized in that, The steps are as follows: (1) Take polyborosiloxane, heat and dissolve it in hydroxyl silicone oil, and stir evenly to obtain a polyborosiloxane solution; the silicon-to-boron ratio of the polyborosiloxane is 1:1; the molecular weight of the hydroxyl silicone oil is 5000 g / mol; the dissolution temperature is 60℃; the mass ratio of the polyborosiloxane to the hydroxyl silicone oil is 100:

6. (2) Take the polyborosiloxane solution obtained in step (1), add ultrafine calcium carbonate and diatomaceous earth, and stir evenly; the mass ratio of ultrafine calcium carbonate to polyborosiloxane solution is 1:10, and the mass ratio of diatomaceous earth to polyborosiloxane solution is 1:

10. (3) Take the sample obtained in step (2), add oleophilic silica filler, the mass ratio of the sample to oleophilic silica is 100:1 to 100:8, stir evenly to obtain polyboron siloxane damping material. The silica grade mentioned in step (3) is HDK®H30, with a specific surface area of ​​250 m². 2 / g.

2. The application of a polyboron-siloxane-alkyl damping material prepared by the method of claim 1 in a viscous damper.

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