Preparation method of fire-retardant high-damping rubber and damping shock pad thereof

Abstract

The application belongs to the technical field of damping materials and provides a preparation method of a fire-retardant high-damping rubber and a damping shock pad, wherein the fire-retardant high-damping rubber is prepared by using chlorinated butyl rubber CIIR1066, POE elastomer, white carbon black, N990 type carbon black, 52# liquid paraffin, decabromodiphenyl ethane, diantimony trioxide, zinc borate, MCA, antioxidant 1076, antioxidant 2246, zinc oxide, stearic acid, resin and DCP vulcanizing agent as ingredients, the application optimizes the components and content of the damping material to obtain a rubber composition with a wide temperature range, high damping, fire retardation up to UL94-V0 level and good mechanical properties.

Description

Technical Field

[0001] This invention belongs to the field of damping material technology, and particularly relates to a method for preparing a flame-retardant high-damping rubber and its damping shock-absorbing pad. Background Technology

[0002] Due to its unique viscoelasticity, rubber can generate significant internal friction (i.e., high damping), and its light weight and ease of processing make it the most researched and widely used damping material. Rubber damping materials are widely used in many fields, including high-speed rail, aerospace, naval vessels, automobiles, and electronics. In particular, the vibration and noise caused by fan rotation in data storage systems of various IT equipment such as servers, computers, workstations, and switches severely affect the lifespan of hard drives, creating a pressing need for high-efficiency damping and vibration reduction products. Furthermore, the increasingly complex operating environments of electronic devices, ranging from extremely low to extremely high temperatures, along with flame-retardant requirements, place extremely high demands on damping materials.

[0003] Wide-temperature-range high-damping materials require a damping factor tanδ > 0.3 within a temperature range of at least -60 to 80°C. Therefore, broadening the temperature range of damping materials, especially improving their damping function above room temperature, is a key issue in expanding their application scope. Chinese invention patent CN104072883A discloses a wide-temperature-range damping material prepared by blending EPDM rubber and epoxidized natural rubber. Although adjusting the amount of epoxidized natural rubber can achieve damping performance over a relatively wide range (-80°C to 70°C) with good physical and mechanical properties, the maximum loss factor within the temperature range is only 0.5, which cannot meet the requirements of some applications with high damping coefficients. Chinese invention patent CN103113682A discloses a wide-temperature-range high-damping material for electronic products and its preparation method. Through the interaction between non-polar butyl rubber, brominated p-tert-octylphenol formaldehyde resin, and polar small-molecule hindered phenol A060, a supramolecular network structure is formed, achieving a temperature range of -60 to 100°C. However, this material does not have UL-94 flame retardancy, and its maximum loss factor is less than 1.0. Its tensile strength is also low, which cannot meet the requirements of some applications with high mechanical performance. Summary of the Invention

[0004] This invention provides a method for preparing flame-retardant high-damping rubber and its damping shock-absorbing pad, aiming to solve the problems existing in the prior art.

[0005] The present invention is achieved as follows: On one hand, the present invention provides a flame-retardant high-damping rubber, comprising the following components by weight: chlorinated butyl rubber CIIR1066-100 parts, POE elastomer-5-15 parts, silica-3-10 parts, N990 type carbon black-20-50 parts, 52# liquid paraffin-2-10 parts, decabromodiphenyl ethane-30-50 parts, antimony trioxide-10-25 parts, zinc borate-10-25 parts, MCA-1-10 parts, antioxidant 1076-1-5 parts, antioxidant 2246-1-5 parts, zinc oxide-3-7 parts, stearic acid-1-3 parts, resin-50-100 parts, and DCP vulcanizing agent-1.0-2 parts.

[0006] Preferably, the resin is 201 resin or 206 resin.

[0007] On the other hand, the present invention also provides a method for preparing a damping shock absorber, comprising the following steps:

[0008] Step S1: Weigh each component of the flame-retardant high-damping rubber according to the weight parts;

[0009] Chlorinated butyl rubber CIIR1066 and POE elastomer are mixed in an internal mixer for 3-10 minutes at a temperature of 60-100℃.

[0010] Step S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 10-30 minutes. Cooling water is circulated at a temperature of 100-140℃. Then, the mixed rubber compound is cooled to room temperature by cutting, rolling, and passing through rollers on an open mill.

[0011] S3: Return the cooled rubber compound from step S2 to the internal mixer, add resin and DCP vulcanizing agent, mix for 5-20 minutes, and circulate cooling water to ensure the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0012] S4: Add the compounded rubber from step S3 to a screw extruder for extrusion. The extruder temperature is 40-70℃. Adjust the thickness of the die installed at the screw extrusion port to 0.5-10mm. Lay the extruded sheet onto a PET release film and calender it through a two-roll calender to control the thickness to 0.4-10mm.

[0013] S5: The pressed sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 140-170°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.1-1m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0014] S6: The damping sheet wound up in step S5 is die-cut on an automatic die-cutting machine to finally obtain the required damping and shock-absorbing pad product.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a method for preparing a flame-retardant high-damping rubber and its damping shock-absorbing pad. The method uses chlorinated butyl rubber CIIR1066, POE elastomer, silica, N990 type carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant 1076, antioxidant 2246, zinc oxide, stearic acid, resin, and DCP vulcanizing agent as ingredients to prepare the flame-retardant high-damping rubber. The present invention optimizes the design of each component and its content in the preparation of the damping material, resulting in a wide-temperature-range high-damping rubber composition with flame retardancy reaching UL94-V0 level. This damping material has a wide operating temperature range, high damping factor, good flame retardancy and aging resistance, and also possesses excellent mechanical properties. Attached Figure Description

[0016] Figure 1 This is a flowchart of a method for preparing a damping shock absorber pad according to the present invention.

[0017] Figure 2 This is the damping spectrum of the damping material in Embodiment 1 of the present invention.

[0018] Figure 3 This is the damping spectrum of the damping material in Embodiment 2 of the present invention.

[0019] Figure 4 This is the damping spectrum of the damping material in Embodiment 3 of the present invention.

[0020] Figure 5 This is the damping spectrum of the damping material in Embodiment 4 of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Example 1

[0023] Please see Figure 1 This embodiment provides a technical solution: a method for preparing flame-retardant high-damping rubber and its damping shock-absorbing pad, wherein the component content (by weight) of the flame-retardant high-damping rubber is as follows:

[0024] Chlorinated butyl rubber CIIR1066 - 100 parts, POE elastomer - 10 parts, silica - 5 parts, N990 carbon black - 30 parts, 52# liquid paraffin - 2 parts, decabromodiphenyl ethane - 40 parts, antimony trioxide - 20 parts, zinc borate - 20 parts, MCA - 2 parts, antioxidant 1076 - 2 parts, antioxidant 2246 - 1 part, zinc oxide - 5 parts, stearic acid - 2 parts, 201 resin - 50 parts, DCP vulcanizing agent - 1.3 parts.

[0025] The preparation methods of the above-mentioned damping rubber and its damping shock absorber are as follows:

[0026] S1: Chlorinated butyl rubber CIIR1066 and POE elastomer are mixed in an internal mixer for 5 minutes at a temperature of 80℃.

[0027] S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 20 minutes. Then, circulate cooling water at 130°C. Finally, cool the mixed rubber compound to room temperature by cutting, rolling, and passing it through rollers on an open mill.

[0028] S3: Return the cooled rubber compound from step S2 to the internal mixer, add 201 resin and DCP vulcanizing agent, mix for 10 minutes, and circulate cooling water to ensure that the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0029] S4: Add the compounded rubber from step S3 to a screw extruder for extrusion at a temperature of 50°C;

[0030] The die thickness at the extrusion nozzle of the rod extruder is adjusted to 0.5mm; the extruded sheet is then laminated onto the PET release film and processed...

[0031] The thickness of the calender roll is controlled at 0.4 mm using a two-roll calender.

[0032] S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 150°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.5m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0033] S6: The damping sheet wound in step S5 is die-cut on an automatic die-cutting machine to obtain a damping and shock-absorbing pad that can be used on a hard drive. Its damping spectrum is as follows: Figure 2 As shown.

[0034] Example 2

[0035] Please see Figure 1This embodiment provides a technical solution: a method for preparing flame-retardant high-damping rubber and its damping shock-absorbing pad, wherein the component content (by weight) of the flame-retardant high-damping rubber is as follows:

[0036] Chlorinated butyl rubber CIIR1066-100 parts, POE elastomer-5 parts, silica-3 parts, N990 carbon black-30 parts, 52# liquid paraffin-8 parts, decabromodiphenyl ethane-30 parts, antimony trioxide-15 parts, zinc borate-15 parts, MCA-10 parts, antioxidant 1076-2 parts, antioxidant 2246-1 part, zinc oxide-5 parts, stearic acid-2 parts, 201 resin-80 parts, DCP vulcanizing agent-1.3 parts.

[0037] The preparation methods of the above-mentioned damping rubber and its damping shock absorber are as follows:

[0038] Step S1: Mix chlorinated butyl rubber CIIR1066 and POE elastomer in an internal mixer for 5 minutes at 80°C.

[0039] Step S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 20 minutes. Cooling water is circulated at a temperature of 125°C. Then, the mixed rubber compound is cooled to room temperature by cutting, rolling, and passing through rollers on an open mill.

[0040] Step S3: Return the cooled rubber compound from step S2 to the internal mixer, add 201 resin and DCP vulcanizing agent, mix for 8 minutes, and circulate cooling water to ensure that the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0041] Step S4: Add the compounded rubber from step S3 to the screw extruder for extrusion at a temperature of 55°C; adjust the thickness of the die installed at the screw extrusion nozzle to 0.5mm; laminate the extruded sheet onto the PET release film and calender it to a thickness of 0.4mm using a two-roll calender.

[0042] Step S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 155°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.7m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0043] Step S6: The damping sheet wound in step S5 is die-cut on an automatic die-cutting machine to obtain a damping shock absorber that can be used on a hard drive. Its damping spectrum is as follows: Figure 3 As shown.

[0044] Example 3

[0045] Please see Figure 1 This embodiment provides a technical solution: a method for preparing flame-retardant high-damping rubber and its damping shock-absorbing pad, wherein the component content (by weight) of the flame-retardant high-damping rubber is as follows:

[0046] Chlorinated butyl rubber CIIR1066 - 100 parts, POE elastomer - 5 parts, silica - 5 parts, N990 carbon black - 30 parts, 52# liquid paraffin - 2 parts, decabromodiphenyl ethane - 30 parts, antimony trioxide - 15 parts, zinc borate - 15 parts, MCA - 10 parts, antioxidant 1076 - 1 part, antioxidant 2246 - 2 parts, zinc oxide - 5 parts, stearic acid - 2 parts, 206 resin - 50 parts, DCP vulcanizing agent - 1.3 parts.

[0047] The preparation methods of the above-mentioned damping rubber and its damping shock absorber are as follows:

[0048] Step S1: Mix chlorinated butyl rubber CIIR1066 and POE elastomer in an internal mixer for 5 minutes at 80°C.

[0049] Step S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 20 minutes. Cooling water is circulated at a temperature of 130°C. Then, the mixed rubber compound is cooled to room temperature by cutting, rolling, and passing through rollers on an open mill.

[0050] Step S3: Return the cooled rubber compound from step S2 to the internal mixer, add 201 resin and DCP vulcanizing agent, mix for 10 minutes, and circulate cooling water to ensure that the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0051] Step S4: Add the compound from step S3 to the screw extruder for extrusion at a temperature of 50°C; adjust the thickness of the die installed at the screw extrusion nozzle to 0.5mm; laminate the extruded sheet onto the PET release film and calender it to a thickness of 0.4mm using a two-roll calender.

[0052] Step S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 155°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.5m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0053] Step S6: The damping sheet wound in step S5 is die-cut on an automatic die-cutting machine to obtain a damping shock absorber that can be used on a hard drive. Its damping spectrum is as follows: Figure 4As shown.

[0054] Example 4

[0055] Please see Figure 1 This embodiment provides a technical solution: a method for preparing flame-retardant high-damping rubber and its damping shock-absorbing pad, wherein the component content of the flame-retardant high-damping rubber is as follows (in parts by weight):

[0056] Chlorinated butyl rubber CIIR1066 - 100 parts, POE elastomer - 5 parts, silica - 3 parts, N990 carbon black - 30 parts, 52# liquid paraffin - 4 parts, decabromodiphenyl ethane - 35 parts, antimony trioxide - 15 parts, zinc borate - 25 parts, MCA - 2 parts, antioxidant 1076 - 1 part, antioxidant 2246 - 2 parts, zinc oxide - 5 parts, stearic acid - 2 parts, 206 resin - 60 parts, DCP vulcanizing agent - 1.3 parts.

[0057] The preparation methods of the above-mentioned damping rubber and its damping shock absorber are as follows:

[0058] Step S1: Mix chlorinated butyl rubber CIIR1066 and POE elastomer in an internal mixer for 5 minutes at 80°C.

[0059] Step S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 20 minutes. Cooling water is circulated at a temperature of 130°C. Then, the mixed rubber compound is cooled to room temperature by cutting, rolling, and passing through rollers on an open mill.

[0060] Step S3: Return the cooled rubber compound from step S2 to the internal mixer, add 201 resin and DCP vulcanizing agent, mix for 10 minutes, and circulate cooling water to ensure that the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0061] Step S4: Add the compound from step S3 to a screw extruder for extrusion at a temperature of 60°C; adjust the thickness of the die installed at the screw extrusion nozzle to 0.5mm; laminate the extruded sheet onto a PET release film and calender it to a thickness of 0.4mm using a two-roll calender.

[0062] Step S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 160°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.7m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0063] Step S6: The damping sheet wound in step S5 is die-cut on an automatic die-cutting machine to obtain a damping shock absorber that can be used on a hard drive. Its damping spectrum is as follows: Figure 5 As shown.

[0064] Comparative Example 1

[0065] This comparative example provides a chlorinated butyl damping rubber, the composition of which is as follows in parts by weight:

[0066] Chlorinated butyl rubber CIIR1066 - 100 parts, silica - 3 parts, N990 type carbon black - 35 parts, zinc oxide - 5 parts, stearic acid - 2 parts, 201 resin - 40 parts, DCP vulcanizing agent - 1.5 parts.

[0067] The preparation methods of the above-mentioned damping rubber and its damping shock absorber are as follows:

[0068] Step S1: Mix chlorinated butyl rubber CIIR1066 in an internal mixer for 5 minutes at a temperature of 80°C;

[0069] Step S2: Add fumed silica, N990 carbon black, zinc oxide and stearic acid into an internal mixer and continue mixing for 20 minutes. Then, circulate cooling water at 130°C. Finally, cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill.

[0070] Step S3: Return the cooled rubber compound from step S2 to the internal mixer, add 201 resin and DCP vulcanizing agent, mix for 10 minutes, and circulate cooling water to ensure that the temperature does not exceed 90°C; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through a roller on an open mill; thus obtaining the flame-retardant high-damping rubber of the present invention.

[0071] Step S4: Add the compound from step S3 to the screw extruder for extrusion at a temperature of 50°C; adjust the thickness of the die installed at the screw extrusion nozzle to 0.5mm; laminate the extruded sheet onto the PET release film and calender it to a thickness of 0.4mm using a two-roll calender.

[0072] Step S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 160°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.5m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut.

[0073] Step S6: The damping sheet wound in step S5 is die-cut on an automatic die-cutting machine to finally obtain the damping shock absorber pad.

[0074] In summary, the formulations of Examples 1-4 and the comparative examples of the present invention are shown in Table 1 below, and the performance test data of the wide temperature range damping material are shown in Table 2 below.

[0075] Table 1 Formulation of Wide Temperature Range Damping Materials

[0076]

[0077]

[0078] Table 2 Performance test data of wide-temperature-range damping materials

[0079]

[0080]

[0081] It can be seen that the damping material of the present invention has both good damping and vibration reduction performance and good mechanical properties over a wide temperature range. In terms of vibration reduction of hard drives, it can meet the requirements for use in a temperature range of -40 to 80℃. In addition, the damping material of the present invention can be widely applied to vibration control and noise control of instruments and electronic systems in aircraft, ships and vehicles, and has broad application prospects.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a damping shock absorber pad, characterized in that: Includes the following steps: Step S1: Weigh the components of the flame-retardant high-damping rubber according to the following parts by weight: chlorinated butyl rubber CIIR1066 - 100 parts, POE elastomer - 10 parts, silica - 5 parts, N990 carbon black - 30 parts, 52# liquid paraffin - 2 parts, decabromodiphenyl ethane - 40 parts, antimony trioxide - 20 parts, zinc borate - 20 parts, MCA - 2 parts, antioxidant 1076 - 2 parts, antioxidant 2246 - 1 part, zinc oxide - 5 parts, stearic acid - 2 parts, resin - 50 parts, DCP vulcanizing agent - 1.3 parts; the resin is 201 resin or 206 resin; Chlorinated butyl rubber CIIR1066 and POE elastomer were mixed in an internal mixer for 5 minutes at 80℃. Step S2: Add fumed silica, N990 carbon black, 52# liquid paraffin, decabromodiphenyl ethane, antimony trioxide, zinc borate, MCA, antioxidant, zinc oxide, and stearic acid into an internal mixer and continue mixing for 20 minutes. Cooling water is circulated at a temperature of 130°C. Then, the mixed rubber compound is cooled to room temperature by cutting, rolling, and passing through rollers on an open mill. S3: Return the cooled rubber compound from step S2 to the internal mixer, add resin and DCP vulcanizing agent, mix for 10 minutes, and circulate cooling water to ensure the temperature does not exceed 90℃; then cool the mixed rubber compound to room temperature by cutting, rolling and passing it through rollers on an open mill; to obtain flame-retardant high-damping rubber. S4: Add the compounded rubber from step S3 to the screw extruder for extrusion at a temperature of 50°C; adjust the thickness of the die installed at the screw extrusion nozzle to 0.5mm; laminate the extruded sheet onto the PET release film and calender it to a thickness of 0.4mm using a two-roll calender. S5: The sheet from step S4 is continuously fed into a drum vulcanizing machine for high-temperature vulcanization at a temperature of 150°C. The drum vulcanizing machine has a roller diameter of 1.5m and a rotation speed of 0.5m / min. Then, the damping sheet exiting the drum vulcanizing machine is backed with adhesive, wound up, and cut. S6: The damping sheet wound up in step S5 is die-cut on an automatic die-cutting machine to finally obtain the required damping and shock-absorbing pad product.

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