High-density silicone rubber suitable for intelligent wearing and preparation process of high-density silicone rubber

Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses high-density silicone rubber suitable for intelligent wearing and a preparation process of the high-density silicone rubber. The high-density silicone rubber suitable for intelligent wearing comprises the following components in parts by mass: 40-60 parts of silicone rubber; 40-48 parts of a modified inorganic filler; 0.3 to 1.5 parts of a coupling agent; 0.1-5 parts of an inorganic pigment; 1.6 to 2.3 parts of a vulcanizing agent; the modified inorganic filler is obtained by modifying a composite inorganic filler with a modification liquid; the composite inorganic filler is formed by compounding titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers; the modified liquid is a compound of a solvent, octadecyl trimethyl ammonium chloride, cyclohexene oxide and linoleic acid. The method has the advantage that the color of the high-density silicone rubber is better kept and is not easy to change.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and in particular to a high-density silicone rubber formula suitable for smart wearables and a preparation process thereof. Background Art

[0002] With the popularity of wearable devices, in order to improve the texture of the devices and obtain a luxurious feel, high-density rubber materials are needed. Currently, fluororubber is often used as a common high-density rubber. However, the fluorinated organic compound perfluorohexanoic acid (PFHxA) belongs to perfluoro and polyfluoroalkyl substances, which are environmentally unfriendly, non-recyclable, non-degradable and bioaccumulative, posing risks to humans and the environment.

[0003] Silicone rubber is highly compatible with the human body, non-toxic and pollution-free, and is the most commonly used rubber raw material for wearable devices. However, the density of silicone rubber is relatively low, which makes it difficult to meet the high-density rubber requirements of wearable devices. To increase the density of silicone rubber, a large amount of inorganic fillers are needed. However, ordinary inorganic fillers have poor resistance to chemicals such as sweat and oleic acid. After wearing for a long time, they are easily affected by sweat and the color of the product. Therefore, there is still room for improvement. Summary of the Invention

[0004] In order to make high-density silicone rubber better maintain its color and not easily change, the present application provides a high-density silicone rubber suitable for smart wearables and a preparation process thereof.

[0005] In a first aspect, the present application provides a high-density silicone rubber suitable for smart wear, which adopts the following technical solution: a high-density silicone rubber suitable for smart wear, comprising the following components in parts by weight: 40-60 parts of silicone rubber; 40-48 parts of modified inorganic filler; 0.3-1.5 parts of coupling agent; 0.1-5 parts of inorganic pigment; 1.6-2.3 parts of vulcanizing agent; The modified inorganic filler is obtained by modifying a composite inorganic filler with a modifying liquid; The composite inorganic filler is a compound of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers; The modified liquid is a compound of solvent, octadecyltrimethylammonium chloride, cyclohexene oxide and linoleic acid.

[0006] By adopting the technical scheme, the modified inorganic filler obtained by modifying the composite inorganic filler compounded by titanium dioxide, zinc oxide, boron nitride and calcium carbonate whisker by the modifying liquid compounded by octadecyl trimethyl ammonium chloride, cyclohexene oxide and linoleic acid is added to the silicone rubber, which can significantly improve the density of the silicone rubber, so that the high-density silicone rubber has good texture, and the silicone rubber is not easy to discolor under the long-term action of sweat and oleic acid, and can maintain the bright color of the silicone rubber for a long time, so that the quality of the prepared smart wearable device is stable.

[0007] Moreover, the modified inorganic filler can significantly improve the strength of the silicone rubber, so that the smart wearable device made of the high-density silicone rubber is more durable and less likely to be damaged.

[0008] Preferably, in the inorganic filler, the mass ratio of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whisker is 25-27:12-14:16-18:7-9.

[0009] By adopting the technical scheme, by specifically selecting the mass ratio of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whisker, the titanium dioxide, zinc oxide, boron nitride and calcium carbonate whisker are combined in a specific ratio, and under the modification effect of the modifying liquid, the color stability of the high-density silicone rubber can be better maintained, and the effect of improving the strength of the high-density silicone rubber is more significant.

[0010] Preferably, in the modifying liquid, the mass ratio of the solvent, octadecyl trimethyl ammonium chloride, cyclohexene oxide and linoleic acid is 100:13-15:11-13:17-19.

[0011] By adopting the technical scheme, by specifically selecting the mass ratio of the solvent, octadecyl trimethyl ammonium chloride, cyclohexene oxide and linoleic acid, the modifying substances are combined in a specific ratio, the modification effect of the modifying liquid on the composite inorganic filler is better, and the effect of maintaining the color stability of the high-density silicone rubber and improving the strength of the high-density silicone rubber is better.

[0012] Preferably, the solvent is an ethanol solution.

[0013] By adopting the technical scheme, by specifically selecting the ethanol solution, the effect of mutual cooperation of each component in the modifying liquid is better, and the modification effect is better.

[0014] Preferably, the preparation method of the modified inorganic filler is as follows: Step 1), uniformly mix the solvent, octadecyl trimethyl ammonium chloride, cyclohexene oxide and linoleic acid to obtain a modifying liquid; Step 2), uniformly mix titanium dioxide, zinc oxide, boron nitride and calcium carbonate whisker to obtain a composite inorganic filler; Step 3) adding the composite inorganic filler into the modified liquid, stirring for 4-6 hours, filtering out the composite inorganic filler, and drying to obtain the modified inorganic filler.

[0015] By adopting the above technical solution, the prepared modified inorganic filler can significantly modify the silicone rubber, increase the density of the silicone rubber, while the color of the high-density silicone rubber is not easily changed, and the strength of the silicone rubber can be significantly improved.

[0016] Preferably, in step 3), the composite inorganic filler is added to the modified liquid, the temperature is kept at 60-70° C., and the mixture is stirred for 4-6 hours.

[0017] By adopting the above technical solution and stirring at 60-70°C for 4-6 hours, the modification is more complete, the modified inorganic filler is more stable, the high-density silicone rubber is less likely to change color, and the strength of the high-density silicone rubber is higher.

[0018] Preferably, the coupling agent is a silane coupling agent.

[0019] By adopting the above technical solution and specifically selecting the silane coupling agent, the compatibility of the modified inorganic filler and the silicone rubber is made higher, and the effect of the modified silicone rubber is more significant.

[0020] In a second aspect, the present application provides a method for preparing high-density silicone rubber suitable for smart wearables, using the following technical solution: A method for preparing the high-density silicone rubber suitable for smart wearables comprises the following steps: Step 01), mixing the modified inorganic filler, inorganic pigment, and coupling agent at 80-100° C. to obtain a premix; Step 02), the premix and silicone rubber are mixed uniformly through a rubber mixing device to obtain a masterbatch; Step 03), the masterbatch and the vulcanizing agent are mixed uniformly through a rubber mixing device to obtain a final rubber mix; Step 04) The final rubber mixture is placed in a mold and heated and cured to obtain a high-density silicone rubber suitable for smart wearables.

[0021] By adopting the above technical solution, the high-density silicone rubber produced has a high density and can reflect a good texture, which well meets the needs of smart wearable devices. In addition, the high-density silicone rubber is not easy to change color and has high strength, making the manufactured smart wearable devices more durable and have higher economic value.

[0022] In summary, this application has the following beneficial effects: 1. This invention involves adding a modified inorganic filler obtained by modifying a composite inorganic filler composed of titanium dioxide, zinc oxide, boron nitride, and calcium carbonate whiskers with a modifying solution composed of octadecyltrimethylammonium chloride, cyclohexene oxide, and linoleic acid to silicone rubber. This significantly increases the density of the silicone rubber, giving the high-density silicone rubber a better texture. Furthermore, the silicone rubber is less likely to discolor under the long-term effects of sweat and oleic acid, maintaining its bright color for a long time and resulting in a stable quality smart wearable device. Furthermore, the modified inorganic filler significantly increases the strength of the silicone rubber, making the smart wearable device made of high-density silicone rubber more durable and less prone to breakage.

[0023] 2. In the present application, it is preferred to specifically select the mass ratio of titanium dioxide, zinc oxide, boron nitride, and calcium carbonate whiskers so that after titanium dioxide, zinc oxide, boron nitride, and calcium carbonate whiskers are combined in a specific ratio, under the modification effect of the modifying liquid, the color stability of the high-density silicone rubber can be better maintained, and the effect of improving the strength of the high-density silicone rubber is more significant.

[0024] 3. In this application, it is preferred to specifically select the mass ratio of the solvent, octadecyltrimethylammonium chloride, cyclohexene oxide, and linoleic acid so that each modifying substance is combined in a specific ratio, so that the modifying liquid has a better modification effect on the composite inorganic filler, so that the modified inorganic filler can better maintain the color stability of the high-density silicone rubber and improve the strength of the high-density silicone rubber. DETAILED DESCRIPTION

[0025] The present application is further described in detail below with reference to the embodiments.

[0026] Example 1 A high-density silicone rubber suitable for smart wearables is prepared from the following components.

[0027] Silicone rubber, modified inorganic filler, coupling agent, inorganic pigment, vulcanizing agent.

[0028] Silicone rubber was purchased from Dow Chemical, model: RBB-2003.

[0029] The coupling agent was purchased from Shandong Qiyun Chemical Technology Co., Ltd., silane coupling agent KH550.

[0030] The inorganic pigment is Pigment Red 101, purchased from BASF, model: BASF Sicotrans red L2915D.

[0031] The vulcanizing agent was vulcanizing agent C-8, which was purchased from Dongguan Kexiwei Electronic Materials Co., Ltd.

[0032] Modified inorganic filler is obtained by modifying the composite inorganic filler with a modifying liquid.

[0033] The composite inorganic filler is a compound of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers.

[0034] Titanium dioxide was purchased from Langfang Qicai Pigments Co., Ltd.

[0035] Zinc oxide was purchased from Zhengzhou Yiteng Chemical Products Co., Ltd.

[0036] Boron nitride was purchased from Jinan Qiangxin Chemical Co., Ltd.

[0037] Calcium carbonate whiskers were purchased from Hubei Xinyuhong Biopharmaceutical Technology Co., Ltd.

[0038] The modified liquid is a compound of solvent, octadecyltrimethylammonium chloride, cyclohexene oxide and linoleic acid.

[0039] The solvent is an ethanol solution with a concentration of 75%, which was purchased from Shandong Bluestar New Materials Co., Ltd.

[0040] Octadecyltrimethylammonium chloride was purchased from Hubei Zhongnuoyaxing Biotechnology Co., Ltd.

[0041] Cyclohexene oxide was purchased from Hunan Jinyu Fine Chemical Co., Ltd.

[0042] Linoleic acid was purchased from Sichuan Huanxu Biotechnology Co., Ltd.

[0043] The preparation method of the modified inorganic filler is as follows: Step 1) 100 kg of ethanol solution, 13 kg of octadecyltrimethylammonium chloride, 11 kg of cyclohexene oxide, and 17 kg of linoleic acid were added to a reaction kettle at a speed of 120 r / min and stirred for 10 minutes to obtain a modified solution.

[0044] Step 2) 25 kg titanium dioxide, 12 kg zinc oxide, 16 kg boron nitride, and 7 kg calcium carbonate whiskers were added into a stirring kettle at a speed of 200 r / min and stirred for 15 minutes to obtain a composite inorganic filler.

[0045] Step 3) 50 kg of composite inorganic filler and 50 kg of modified liquid were put into a reactor, kept at a constant temperature of 60° C. and a rotation speed of 60 r / min, stirred for 4 h, filtered out the composite inorganic filler, and dried at 110° C. for 2 h to obtain a modified inorganic filler.

[0046] The preparation method of high-density silicone rubber suitable for smart wearables includes the following steps: Step 01) 40 kg of modified inorganic filler, 0.1 kg of inorganic pigment, and 0.3 kg of silane coupling agent were put into a stirred tank, kept at a constant temperature of 80° C., a rotation speed of 60 r / min, and stirred for 15 min to obtain a premix; Step 02), 40.4 kg of the premix and 40 kg of the silicone rubber were put into a mixer, the speed was 60 r / min, the temperature was 100℃, and the mixing time was 10 min, to obtain a masterbatch; Step 03), 80.4 kg of the masterbatch and 1.6 kg of the curing agent were put into an open mill, and mixed for 10 times to obtain a final rubber; Step 04), the final rubber was put into a mold, and vulcanized at 10 MPa and 165℃ for 10 min, then cooled and demolded, and then secondarily vulcanized at 200℃ for 4 h, and cooled to room temperature, to obtain the high-density silicone rubber suitable for smart wear.

[0047] Example 2 A high-density silicone rubber suitable for smart wear was prepared from the following components.

[0048] Silicone rubber, modified inorganic filler, coupling agent, inorganic pigment, curing agent.

[0049] The silicone rubber was purchased from Dow Chemical, and the model was RBB-2003.

[0050] The coupling agent was purchased from Shandong Qiyun Chemical Technology Co., Ltd., and the silane coupling agent KH550.

[0051] The inorganic pigment was Pigment Red 101, purchased from BASF, and the model was BASF Sicotrans red L2915D.

[0052] The curing agent was curing agent C-8, purchased from Dongguan Kexiwei Electronic Material Co., Ltd.

[0053] The modified inorganic filler was obtained by modifying the composite inorganic filler with a modification liquid.

[0054] The composite inorganic filler was a complex of titanium dioxide, zinc oxide, boron nitride, and calcium carbonate whisker.

[0055] The titanium dioxide was purchased from Langfang Qicha Pigment Co., Ltd.

[0056] The zinc oxide was purchased from Zhengzhou Yiteng Chemical Product Co., Ltd.

[0057] The boron nitride was purchased from Jinan Qiangxin Chemical Co., Ltd.

[0058] The calcium carbonate whisker was purchased from Hubei Xiyuhong Biological Medicine Technology Co., Ltd.

[0059] The modification liquid was a complex of a solvent, octadecyl trimethyl ammonium chloride, cyclohexene oxide, and linoleic acid.

[0060] The solvent was an ethanol solution with a concentration of 75%, purchased from Shandong Lansheng New Material Co., Ltd.

[0061] The octadecyl trimethyl ammonium chloride was purchased from Hubei Zhongnuo Yaxing Biological Technology Co., Ltd.

[0062] Cyclohexene oxide was purchased from Hunan Jinyu Fine Chemical Co., Ltd.

[0063] Linoleic acid was purchased from Sichuan Huanxu Biotechnology Co., Ltd.

[0064] The preparation method of the modified inorganic filler is as follows: Step 1) 100 kg of ethanol solution, 14 kg of octadecyltrimethylammonium chloride, 12 kg of cyclohexene oxide, and 18 kg of linoleic acid were added to a reaction kettle at a speed of 120 r / min and stirred for 10 minutes to mix evenly to obtain a modified solution.

[0065] Step 2) 26 kg titanium dioxide, 13 kg zinc oxide, 17 kg boron nitride, and 8 kg calcium carbonate whiskers were added into a stirring kettle at a speed of 200 r / min and stirred for 15 minutes to obtain a composite inorganic filler.

[0066] Step 3) 50 kg of composite inorganic filler and 50 kg of modified liquid were put into a reactor, kept at a constant temperature of 65°C and a rotation speed of 60 r / min, stirred for 5 hours, filtered out the composite inorganic filler, and dried at 110°C for 2 hours to obtain a modified inorganic filler.

[0067] The preparation method of high-density silicone rubber suitable for smart wearables includes the following steps: Step 01) 44 kg of modified inorganic filler, 2.5 kg of inorganic pigment, and 1 kg of silane coupling agent were put into a stirred tank, kept at a constant temperature of 90° C., a rotation speed of 60 r / min, and stirred for 15 min to obtain a premix; Step 02), 47.5 kg of premix and 50 kg of silicone rubber were put into an internal mixer at a speed of 60 r / min and a constant temperature of 110° C. for 12 min to obtain a masterbatch; Step 03), 97.5kg masterbatch and 1.95kg vulcanizing agent were put into an open mill, passed through 10 times, and mixed uniformly to obtain the final rubber mix; Step 04) Place the final rubber mixture into a mold, vulcanize at 10 MPa and 165°C for 10 minutes, cool and demould, then perform secondary vulcanization at 200°C for 4 hours, and cool to room temperature to obtain high-density silicone rubber suitable for smart wearables.

[0068] Example 3 A high-density silicone rubber suitable for smart wearables is prepared from the following components.

[0069] Silicone rubber, modified inorganic filler, coupling agent, inorganic pigment, vulcanizing agent.

[0070] Silicone rubber was purchased from Dow Chemical, model: RBB-2003.

[0071] The coupling agent was purchased from Shandong Qiyun Chemical Technology Co., Ltd., silane coupling agent KH550.

[0072] The inorganic pigment is Pigment Red 101, purchased from BASF, model: BASF Sicotrans red L2915D.

[0073] The vulcanizing agent was vulcanizing agent C-8, which was purchased from Dongguan Kexiwei Electronic Materials Co., Ltd.

[0074] Modified inorganic filler is obtained by modifying the composite inorganic filler with a modifying liquid.

[0075] The composite inorganic filler is a compound of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers.

[0076] Titanium dioxide was purchased from Langfang Qicai Pigments Co., Ltd.

[0077] Zinc oxide was purchased from Zhengzhou Yiteng Chemical Products Co., Ltd.

[0078] Boron nitride was purchased from Jinan Qiangxin Chemical Co., Ltd.

[0079] Calcium carbonate whiskers were purchased from Hubei Xinyuhong Biopharmaceutical Technology Co., Ltd.

[0080] The modified liquid is a compound of solvent, octadecyltrimethylammonium chloride, cyclohexene oxide and linoleic acid.

[0081] The solvent is an ethanol solution with a concentration of 75%, which was purchased from Shandong Bluestar New Materials Co., Ltd.

[0082] Octadecyltrimethylammonium chloride was purchased from Hubei Zhongnuoyaxing Biotechnology Co., Ltd.

[0083] Cyclohexene oxide was purchased from Hunan Jinyu Fine Chemical Co., Ltd.

[0084] Linoleic acid was purchased from Sichuan Huanxu Biotechnology Co., Ltd.

[0085] The preparation method of the modified inorganic filler is as follows: Step 1) 100 kg of ethanol solution, 15 kg of octadecyltrimethylammonium chloride, 13 kg of cyclohexene oxide, and 19 kg of linoleic acid were added to a reaction kettle at a speed of 120 r / min and stirred for 10 minutes to mix evenly to obtain a modified solution.

[0086] Step 2) 27 kg titanium dioxide, 14 kg zinc oxide, 18 kg boron nitride, and 9 kg calcium carbonate whiskers were added into a stirring kettle at a speed of 200 r / min and stirred for 15 minutes to obtain a composite inorganic filler.

[0087] Step 3) 50 kg of composite inorganic filler and 50 kg of modified liquid were put into a reactor, kept at a constant temperature of 70°C and a rotation speed of 60 r / min, stirred for 6 hours, the composite inorganic filler was filtered out, and dried at 110°C for 2 hours to obtain a modified inorganic filler.

[0088] The preparation method of high-density silicone rubber suitable for smart wearables includes the following steps: Step 01) 48 kg of modified inorganic filler, 5 kg of inorganic pigment, and 1.5 kg of silane coupling agent were put into a stirred tank, kept at a constant temperature of 100° C., a rotation speed of 60 r / min, and stirred for 15 min to obtain a premix; Step 02), 54.5 kg of premix and 60 kg of silicone rubber were put into an internal mixer at a speed of 60 r / min and a constant temperature of 120° C. for 15 min to obtain a masterbatch; Step 03), 114.5kg masterbatch and 2.3kg vulcanizing agent were put into an open mill, passed through 10 times, mixed evenly, and the final rubber mixture was obtained; Step 04) Place the final rubber mixture into a mold, vulcanize at 10 MPa and 165°C for 10 minutes, cool and demould, then perform secondary vulcanization at 200°C for 4 hours, and cool to room temperature to obtain high-density silicone rubber suitable for smart wearables.

[0089] Comparative Example 1 A high-density silicone rubber suitable for smart wearables, which differs from Example 1 only in that: In the preparation method of the modified inorganic filler, an equal amount of sodium p-toluenesulfonate is used to replace octadecyltrimethylammonium chloride.

[0090] Sodium p-toluenesulfonate was purchased from Shandong Ruifeng New Materials Co., Ltd.

[0091] Comparative Example 2 A high-density silicone rubber suitable for smart wearables, which differs from Example 1 only in that: In the preparation method of the modified inorganic filler, an equal amount of polyethylene glycol-2000 is used to replace cyclohexene oxide.

[0092] Polyethylene glycol-2000 was purchased from Bashifu (Shanghai) Biomedicine Technology Co., Ltd.

[0093] Comparative Example 3 A high-density silicone rubber suitable for smart wearables, which differs from Example 1 only in that: In the preparation method of the modified inorganic filler, isomeric tridecanol polyoxyethylene ether is used to replace linoleic acid in equal amounts.

[0094] Isomeric tridecanol polyoxyethylene ether was purchased from Shandong Tianzeda Chemical Co., Ltd. Comparative Example 4 A high-density silicone rubber suitable for smart wearables, which differs from Example 1 only in that: In the preparation method of the modified inorganic filler, sodium p-toluenesulfonate is used to replace octadecyltrimethylammonium chloride in equal amounts; polyethylene glycol-2000 is used to replace cyclohexene oxide in equal amounts; and isomeric tridecanol polyoxyethylene ether is used to replace linoleic acid in equal amounts.

[0095] Sodium p-toluenesulfonate was purchased from Shandong Ruifeng New Materials Co., Ltd.

[0096] Polyethylene glycol-2000 was purchased from Bashifu (Shanghai) Biopharmaceutical Technology Co., Ltd.

[0097] Isomeric tridecanol polyoxyethylene ether was purchased from Shandong Tianzeda Chemical Co., Ltd. Experiment 1 Chemical resistance test 1. Prepare the high-density silicone rubber suitable for smart wearables in each embodiment and comparative example into a sample with a length of 5 cm, a width of 5 cm, and a thickness of 1 mm.

[0098] The samples of each embodiment or comparative example form a group, each group contains 11 samples, one sample is randomly selected from each group as a control sample, and the remaining 10 samples are tested.

[0099] The control sample is placed in the air, and the test sample is immersed in a sodium chloride solution at a constant temperature of 60°C for 48 hours. The test sample is compared with the control sample, and the color of the test sample is observed one by one to see if there is a visible difference between the color of the test sample and the color of the control sample. The number of test samples that are visible to the naked eye and the color of the control sample is recorded as the color change number of the sodium chloride solution sample.

[0100] Sodium chloride solution: 5g sodium chloride, 95g tap water, mix well.

[0101] 2. Prepare the high-density silicone rubber suitable for smart wearables in each embodiment and comparative example into a sample with a length of 5 cm, a width of 5 cm, and a thickness of 1 mm.

[0102] The samples of each embodiment or comparative example form a group, each group contains 11 samples, one sample is randomly selected from each group as a control sample, and the remaining 10 samples are tested.

[0103] The control sample is placed in the air, and the test sample is immersed in oleic acid at a constant temperature of 60°C for 48 hours. The test sample is compared with the control sample, and the color of the test sample is observed one by one to see if there is a visible difference between the color of the test sample and the color of the control sample. The number of test samples that are visible to the naked eye and the color of the control sample is recorded as the color change amount of the oleic acid sample.

[0104] Oleic acid was purchased from Shandong Hairui New Materials Co., Ltd. with a content of 99.9%.

[0105] Experiment 2 According to GB / T528-2009 “Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber”, the tensile strength of the test samples made of high-density silicone rubber suitable for smart wear in each embodiment and comparative example was tested.

[0106] The specimen used is dumbbell-shaped specimen type 1.

[0107] In the laboratory, the tensile testing machine has a tensile speed of 500 mm / min, an ambient temperature of 25°C, and a relative humidity of 50%.

[0108] The specific experimental data of Experiments 1-2 are shown in Table 1.

[0109] Table 1 According to the data comparison of each embodiment and comparative example in Table 1, the chemical resistance performance of each embodiment is significantly better than that of each comparative example. Each embodiment does not change color when immersed in sodium chloride solution or oleic acid for a long time at high temperature, which proves that the high-density silicone rubber of each embodiment can maintain color stability for a long time when worn on the human body and is not prone to discoloration.

[0110] At the same time, the tensile strength of each embodiment is significantly higher than that of each comparative example, proving that the effect of modifying the composite inorganic filler with octadecyltrimethylammonium chloride, cyclohexene oxide, and linoleic acid in each embodiment is more significant, so that the modified inorganic filler can better stabilize the pigment color, making the high-density silicone rubber less likely to change color, and at the same time can significantly improve the tensile strength of the high-density silicone rubber, making the high-density silicone rubber less likely to break and having a longer service life.

[0111] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-density silicone rubber suitable for smart wearables, characterized by: The composition includes the following parts by weight: 40-60 parts of silicone rubber; 40-48 parts of modified inorganic filler; 0.3-1.5 parts of coupling agent; 0.1-5 parts of inorganic pigment; 1.6-2.3 parts of vulcanizing agent; The modified inorganic filler is obtained by modifying a composite inorganic filler with a modifying liquid; The composite inorganic filler is a compound of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers; The modified liquid is a compound of solvent, octadecyltrimethylammonium chloride, cyclohexene oxide and linoleic acid.

2. The high-density silicone rubber suitable for smart wearables according to claim 1, characterized in that: In the inorganic filler, the mass ratio of titanium dioxide, zinc oxide, boron nitride and calcium carbonate whiskers is 25-27:12-14:16-18:7-9.

3. The high-density silicone rubber suitable for smart wear according to claim 2, characterized in that: In the modified liquid, the mass ratio of the solvent, octadecyltrimethylammonium chloride, cyclohexene oxide, and linoleic acid is 100:13-15:11-13:17-19.

4. The high-density silicone rubber suitable for smart wear according to claim 3, characterized in that: The solvent is ethanol solution.

5. The high-density silicone rubber suitable for smart wearables according to claim 4, characterized in that: The preparation method of the modified inorganic filler is as follows: Step 1) uniformly mixing the solvent, octadecyltrimethylammonium chloride, cyclohexene oxide, and linoleic acid to obtain a modified solution; Step 2), titanium dioxide, zinc oxide, boron nitride, and calcium carbonate whiskers are uniformly mixed to obtain a composite inorganic filler; Step 3) adding the composite inorganic filler into the modified liquid, stirring for 4-6 hours, filtering out the composite inorganic filler, and drying to obtain the modified inorganic filler.

6. The high-density silicone rubber suitable for smart wearables according to claim 5, characterized in that: In the step 3), the composite inorganic filler is added to the modified liquid, kept at a constant temperature of 60-70° C., and stirred for 4-6 hours.

7. The high-density silicone rubber suitable for smart wearables according to claim 1, characterized in that: The coupling agent is a silane coupling agent.

8. A method for preparing high-density silicone rubber suitable for smart wearables according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 01), the modified inorganic filler, inorganic pigment and coupling agent are mixed at 80-100°C to obtain a premix; Step 02), the premix and silicone rubber are mixed uniformly through a rubber mixing device to obtain a masterbatch; Step 03), the masterbatch and the vulcanizing agent are mixed evenly through the rubber mixing equipment to obtain the final rubber mix; Step 04) The final rubber mixture is placed in a mold and heated and cured to obtain high-density silicone rubber suitable for smart wearables.

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