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Preparation method of hydroxy terminated polydimethylsiloxane with ring structure and application of method

The technology of hydroxypolysiloxane and hydroxypolydimethylsiloxane is applied in the field of preparation of hydroxyl base polymer with ring structure, which can solve the problems of poor physical and mechanical strength, crushing and cracking, high price, etc. The effect of improving mechanical properties, high elongation, and improving toughness

Active Publication Date: 2019-03-19
周群邦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Transparent silicone rubber potting materials are generally divided into addition-type potting materials and condensation-type potting materials, but transparent silicone rubber potting materials have poor physical and mechanical strength, and the shielding end will be broken and cracked by a slight external force. Waterproof reliability has a great impact
In order to solve the physical and mechanical properties of transparent silicone rubber potting materials, the industry generally adds expensive silicone resin materials, but the reinforcing effect is not ideal and the price is expensive

Method used

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  • Preparation method of hydroxy terminated polydimethylsiloxane with ring structure and application of method
  • Preparation method of hydroxy terminated polydimethylsiloxane with ring structure and application of method
  • Preparation method of hydroxy terminated polydimethylsiloxane with ring structure and application of method

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preparation example Construction

[0029] The preparation method of the above-mentioned hydroxyl polysiloxane with ring structure comprises the following steps:

[0030] (1) Add 291 to 297 parts by weight of α, ω-dihydroxy polysiloxane and 0.3 to 1.5 parts by weight of platinum catalyst into a reactor with a constant temperature function, stir for 5 minutes, and set the temperature at 23±2°C Add 1.5-3 parts by weight of hydrogen-containing cyclic body dropwise, and stir for 5 minutes. Set the material temperature to 35°C;

[0031] (2) The temperature rises to 35±2°C, heat preservation reaction for 1.8 to 2 hours, add 0.01 to 0.05 parts by weight of 1-ethynyl-1-cyclohexanol, stir for 5 minutes, set the material temperature to 80°C; the stirring speed of the reaction 180-200 rpm;

[0032] (3) The temperature is raised to 80±2°C, and the low molecules are removed in vacuum for 1 hour, and the vacuum degree is -0.095MPa~-0.1MPa; the temperature is lowered, and the material is discharged to obtain a hydroxypolysil...

Embodiment 1

[0036] The raw materials used in this embodiment and the ratio of raw materials are as shown in Table 1:

[0037] Table 1 raw materials and proportioning:

[0038]

[0039] Using the ratio of raw materials in Table 1, the hydroxypolysiloxane with ring structure of the present invention is prepared through the following steps:

[0040] (1) Add the No. 1 and No. 2 materials into the reactor with constant temperature function, start stirring, and the rotation speed is 190 rpm. After 5 minutes, add No. 3 materials at 23±2°C, and set the material temperature to 35 ℃;

[0041] (2) The temperature rises to 35±2°C, heat preservation reaction for 1.8 hours, add the material in No. 4, and set the material temperature to 80°C;

[0042] (3) The temperature is raised to 80±2° C., and the low molecules are removed in vacuum for 1 hour; the temperature is lowered, and the material is discharged to obtain a hydroxy polysiloxane with a ring structure.

[0043] Add 1 part of tetraethoxysi...

Embodiment 2

[0045] The raw materials used in this embodiment and the ratio of raw materials are as shown in Table 2:

[0046] Table 2 raw materials and ratio

[0047]

[0048] Using the ratio of raw materials in Table 2, the hydroxypolysiloxane with ring structure of the present invention is prepared through the following steps:

[0049](1) Add the No. 1 and No. 2 materials into the reactor with constant temperature function, start stirring, and the rotation speed is 190 rpm. After 5 minutes, add No. 3 materials at 23±2°C, and set the material temperature to 35 ℃;

[0050] (2) The temperature rises to 35±2°C, heat preservation reaction for 1.8 hours, add the material in No. 4, and set the material temperature to 80°C;

[0051] (3) The temperature is raised to 80±2° C., and the low molecules are removed in vacuum for 1 hour; the temperature is lowered, and the material is discharged to obtain a hydroxy polysiloxane with a ring structure.

[0052] Add 1 part of tetraethoxysilane and 0...

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Abstract

The invention provides a preparation method of hydroxy terminated polydimethylsiloxane with a ring structure and an application of the method. The hydroxy terminated polydimethylsiloxane with the ringstructure prepared by the method is a colorless and transparent fluid, can be used as a basic polymer in transparent condensation type silicone rubber two-component potting materials, and can furtherbe used in the transparent condensation type silicone rubber two-component potting materials in combination with alpha, omega-dihydroxy terminated polydimethylsiloxane, so that the toughness of the transparent condensation type silicone rubber potting materials can be greatly improved. According to the product, the ring structure is introduced into the molecular structure of the linear hydroxy terminated polydimethylsiloxane, and a silica gel elastomer is added with the hydroxy terminated polydimethylsiloxane with the ring structure, so that the product has the effect of greatly improving thephysical and mechanical properties, has very good toughness, and the elongation rate is as high as 900%.

Description

technical field [0001] The invention belongs to the field of modified base polymers, and in particular relates to a preparation method and application of a ring-shaped structure hydroxyl base polymer used for transparent condensation type two-component room temperature vulcanized silicone rubber. Background technique [0002] With the development of society, electronic products, lighting products and lighting products are becoming more and more popular, and their requirements for light transmission, water resistance and physical and mechanical properties of materials are also getting higher and higher. Therefore, the demand for highly transparent weather-resistant packaging materials is also increasing. [0003] Transparent silicone rubber potting materials are generally divided into addition-type potting materials and condensation-type potting materials, but transparent silicone rubber potting materials have poor physical and mechanical strength, and the shielding end will ...

Claims

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Application Information

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IPC IPC(8): C08G77/38C08G77/16C08L83/06C08K5/5415C08K5/57
CPCC08G77/16C08G77/38C08K5/5415C08K5/57C08L2201/10C08L83/06
Inventor 周群邦
Owner 周群邦