CN112375390B - Antistatic silicone rubber material and preparation method thereof - Google Patents
Antistatic silicone rubber material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an antistatic silicone rubber material and a preparation method thereof. The material comprises: the silicone rubber base adhesive comprises the following materials in parts by mass; 1-10 parts of nano silver antistatic agent; wherein the nano silver antistatic agent comprises nano silver particles with silicon hydroxyl groups modified on the surfaces. The material has the characteristics of good antistatic effect and difficult precipitation of metal ions.
Description
Technical Field
The invention relates to the technical field of silicone rubber materials, in particular to an antistatic silicone rubber material.
Background
The silicone rubber product is widely applied to the fields of mobile phones, intelligent wear, household appliances and the like. The silicon rubber has skin-friendly property and chemical stability, can be used for wrist bands and head-wearing products contacting human skin, and has a Si-O structure, so that the silicon rubber has cold resistance. The silicone rubber is still soft and pliable at low temperatures.
However, silicone rubber has excellent insulation properties, but its surface is liable to accumulate charges, thereby generating an electrostatic adsorption phenomenon. In this way, dust, impurities, etc. in the environment are easily electrostatically adsorbed on the surface of the silicone rubber, and are difficult to remove.
Disclosure of Invention
An object of the present invention is to provide a new technical solution for antistatic silicone rubber materials.
According to a first aspect of the present invention, an antistatic silicone rubber material is provided. The material comprises: the following materials are used in parts by mass,
100 parts of methyl vinyl silicone rubber base rubber; and
1-10 parts of nano silver antistatic agent;
wherein the nano silver antistatic agent comprises nano silver particles with silicon hydroxyl groups modified on the surfaces.
Optionally, the molar content of vinyl siloxane in the methyl vinyl silicone rubber base rubber is 0.1% -0.4%.
Optionally, the paint further comprises 10-50 parts of filler, wherein the filler comprises at least one of fumed silica and calcium carbonate.
Optionally, 5-12 parts of foaming agent is also included.
Optionally, the nano silver particles have a size ranging from 10nm to 100nm.
Optionally, the viscosity of the silicone rubber base rubber is 100 mpa.s-5000 mpa.s.
Optionally, the nano silver particles are at least one of spherical, ellipsoidal, cuboid and triangular.
Optionally, the preparation method of the nano silver particles with the surface modified with the silicon hydroxyl groups comprises the following steps:
adding tetraethoxysilane, a cosolvent and a pH regulator into deionized water, and keeping the solution alkaline to perform hydrolysis reaction;
adding the nano silver particles into the solution, and uniformly dispersing;
the uniformly dispersed solution is heated.
Optionally, the co-solvent comprises at least one of methanol, ethanol, dioxane, ethylene glycol, glycerol, and acetone.
Optionally, the anti-static silicone rubber material has a dripping angle of 60 ° -90 °.
According to another embodiment of the present disclosure, there is provided a method for preparing the above antistatic silicone rubber material, including: the nano silver antistatic agent is added into the silicone rubber base adhesive and is uniformly mixed.
According to one embodiment of the present disclosure, nano silver particles having surface modified with silicon hydroxyl groups are used as a main agent of the nano silver antistatic agent. The nano silver particles are bonded with silicon hydroxyl groups through chemical reaction. The silicon atom comprises four bonds, one of which is bonded to a hydroxyl group and the other is bonded to the nano-silver particle. In the cross-linking reaction process, the silicon hydroxyl is dehydrogenated and then bonded with methyl vinyl silicone rubber base rubber, so that nano silver particles are bonded on the molecular chain of polysiloxane.
In the antistatic silicone rubber material, adjacent nano silver particles on polysiloxane molecular chains are conducted to form a conductive path, so that the conductivity of the silicone rubber material is improved, charges are dispersed in the antistatic silicone rubber material, and charges are prevented from being accumulated on the surface, and thus, the nano silver antistatic agent plays an antistatic role and dust is prevented from adhering to the surface of the antistatic silicone rubber material.
In addition, the silicon hydroxyl group of the nano silver antistatic agent is subjected to chemical reaction with methyl vinyl silicone rubber base rubber after dehydrogenation so as to bond the silicon hydroxyl group and polysiloxane together. In this way, the nano silver particles form a binding force with the polysiloxane through the silicon hydroxyl group, not a simple physical mixing. Under the action of the bonding force, the positions of the nano silver particles are fixed, so that the nano silver particles cannot be separated out from the surface of the silicon rubber material.
In addition, since the nano silver particles are grafted on the branched chains of the polysiloxane, the positions of the nano silver particles are fixed, so that stable conduction paths can be formed between the nano silver particles without interruption of the conduction paths of charges due to movement of the nano silver particles. Therefore, the antistatic effect of the antistatic silicone rubber material is more stable. Even if the antistatic silicone rubber material is prepared into a foaming material, i.e. cells are formed inside, good antistatic effect can be maintained.
In addition, the nano silver antistatic agent has good antibacterial effect, and can improve the hydrophilicity of the silicone rubber material, thereby further preventing dust from adhering to the surface of the antistatic silicone rubber material.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart of a method of preparing nano-silver particles surface-modified with silicon hydroxyl groups according to one embodiment of the present disclosure.
Fig. 2 is a chemical reaction process diagram of tetraethyl orthosilicate and nano-silver particles according to one embodiment of the disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
According to one embodiment of the present disclosure, an antistatic silicone rubber material is provided. The material comprises: the following materials are used in parts by mass,
100 parts of methyl vinyl silicone rubber base rubber; and
1-10 parts of nano silver antistatic agent;
wherein the nano silver antistatic agent comprises nano silver particles with silicon hydroxyl groups modified on the surfaces.
Specifically, the methyl vinyl silicone rubber-based adhesive is formed by copolymerizing dimethyl siloxane and vinyl siloxane. The methyl vinyl silicone rubber has the characteristics of high temperature resistance, low temperature resistance and excellent ageing resistance.
The methyl vinyl silicone rubber base rubber generates a silicone rubber product through a crosslinking reaction. The nano silver antistatic agent is mixed with methyl vinyl silicone rubber base adhesive. The nano silver antistatic agent is uniformly dispersed in the methyl vinyl silicone rubber base adhesive. During the cross-linking reaction, the silicon hydroxyl groups are bonded with the methyl vinyl silicone rubber base rubber, and the nano silver particles are grafted on the branched chains of the polysiloxane.
The inventors of the present invention found that the nano silver particles were movable because the nano silver particles and the silicone rubber base were physically mixed together without forming a bond therebetween in a manner of directly adding the nano silver particles to the silicone rubber base. As the service time is prolonged, nano silver particles can be separated out from the surface of the silicone rubber material, so that the surface of the silicone rubber material is shiny and whitish; further, the movement of the nano silver particles causes a decrease in conductivity of the silicone rubber material and a deterioration in antistatic effect.
In the embodiment of the disclosure, nano silver particles with silicon hydroxyl groups modified on the surfaces are used as a main agent of the nano silver antistatic agent. The nano silver particles are bonded with silicon hydroxyl groups through chemical reaction. The silicon atom comprises four bonds, one of which is bonded to a hydroxyl group and the other is bonded to the nano-silver particle. In the cross-linking reaction process, the silicon hydroxyl and the methyl vinyl silicone rubber base rubber side chain hydroxyl are subjected to condensation reaction, so that the nano silver particles are bonded on the molecular chain of polysiloxane.
In the antistatic silicone rubber material, micro-conductive paths are formed between adjacent nano silver particles on polysiloxane molecular chains, so that the volume resistivity of the silicone rubber material is reduced, and charges accumulated on the surface are conducted and dispersed, so that the nano silver antistatic agent plays an antistatic role, and dust adhesion on the surface of the silicone rubber material due to electrostatic adsorption is avoided.
In addition, the nano silver antistatic agent and the methyl vinyl silicone rubber base rubber side chain undergo condensation reaction so that silicon hydroxyl and polysiloxane are bonded together to form a chemical bond, and the chemical bond exists stably in a polysiloxane molecular chain, so that the problem of precipitation of the antistatic agent caused by conventional physical blending is avoided.
In addition, since the nano silver particles are grafted on the side chains of the polysiloxane, the nano silver particles can exist stably in the molecular chains, so that stable micro conductive paths exist between the polysiloxane molecular chains. Therefore, the antistatic effect of the antistatic silicone rubber material is more stable. Even if the antistatic silicone rubber material is prepared into a foaming material, i.e. cells are formed inside, good antistatic effect can be maintained.
In addition, the nano silver antistatic agent has good antibacterial effect, and can improve the hydrophilicity of the silicone rubber material, thereby further preventing dust from adhering to the surface of the antistatic silicone rubber material.
In one example, the methyl vinyl silicone rubber has a viscosity in the range of 100 mpa.s to 5000 mpa.s.
For example, in the methyl vinyl silicone rubber base rubber, the molar content of the vinyl siloxane is 0.1 to 0.4% (i.e., mole percent), and in this range, the aging resistance and the high temperature stability of the methyl vinyl silicone rubber are more excellent.
In one example, the antistatic silicone rubber material further comprises a filler, 10-50 parts (by mass). The filler comprises at least one of fumed silica and calcium carbonate. The filler is mixed with the silicone rubber base rubber to improve the tensile strength, hardness, tear strength, durability and the like of the silicone rubber material.
The more the filler content, the higher the hardness of the antistatic silicone rubber material, but the flexibility decreases; on the contrary, the smaller the filler content, the higher the flexibility of the antistatic silicone rubber material, but the hardness, tear resistance, etc. are decreased. In this example, the filler is 10 to 50 parts, and in this ratio range, the antistatic silicone rubber material is high in hardness, flexibility, tensile strength, durability, and the like.
In one example, the antistatic silicone rubber material further comprises a foaming agent in an amount of 5 to 12 parts by mass. The foaming agent is capable of forming densely distributed cells within the antistatic silicone rubber material. For example, the size of the pores is micro-, and/or nano-sized. The antistatic silicone rubber material is foamed to form a foaming material. The foaming agent has the effect of reducing weight, and reduces the density of the antistatic silicone rubber material.
In addition, the foaming agent can obviously improve the elasticity, toughness and deformability of the antistatic silicone rubber material.
Optionally, the foaming agent is a physical foaming agent that does not chemically react with the methyl vinyl silicone rubber based adhesive. The physical blowing agent generates gas during heating, thereby forming bubbles within the methyl vinyl silicone rubber-based adhesive. For example, the physical blowing agent includes one or more of sodium bicarbonate, ammonium bicarbonate, chitosan, and methylcellulose.
The above materials can be mixed with methyl vinyl silicone rubber base rubber and can form cells in antistatic silicone rubber materials.
In one example, the nano-silver particles range in size from 10nm to 100nm. In the size range, the nano silver particles are easy to form bonding with silicon hydroxyl groups, and the formed nano silver antistatic agent is fine. The compatibility of the nano silver antistatic agent and the methyl vinyl silicone rubber base rubber is good.
In addition, after the formation of the nano silver antistatic agent, conductive paths are easily formed between the nano silver particles within the size range.
In one example, the nano silver particles are at least one of spherical, ellipsoidal, rectangular, and triangular. The nano silver particles with the shape can form bonding with silicon hydroxyl groups and can be uniformly dispersed in the methyl vinyl silicone rubber base rubber.
Of course, the shape of the nano silver particles is not limited to the above-described embodiment, and may be other nano-sized forms that can exist stably.
In one example, the methyl vinyl silicone rubber-based gum has a viscosity of 100 Mpa-s to 5000 Mpa-s. The smaller the viscosity of the methyl vinyl silicone rubber base rubber is, the easier the nano silver antistatic agent is dispersed in the methyl vinyl silicone rubber base rubber, but the lower the strength of the formed antistatic silicone rubber material is; on the contrary, the higher the viscosity of the methyl vinyl silicone rubber base rubber is, the strength of the formed antistatic silicone rubber material is improved, but the nano silver antistatic agent is not easy to disperse in the methyl vinyl silicone rubber base rubber. In the range, the dispersing effect of the nano silver antistatic agent and the strength of the antistatic silicone rubber material are considered.
In one example, the method for preparing the nano silver particles with the surface modified with the silicon hydroxyl groups comprises the following steps:
adding tetraethoxysilane (Tetraethyl orthosilicate, TEOS), a cosolvent and a pH regulator into deionized water, and keeping the solution alkaline to perform hydrolysis reaction;
adding the nano silver particles into the solution, and uniformly dispersing;
the uniformly dispersed solution is heated.
In this example, the co-solvent is a solvent that is miscible with the TEOS hydrolysate, deionized water. TEOS is dissolved in deionized water under the action of a cosolvent, and the cosolvent can improve the solubility of TEOS in deionized water. The pH of the solution is adjusted to alkaline by a pH adjuster. Under alkaline conditions, TEOS undergoes hydrolysis.
Under the action of forced stirring or ultrasonic dispersion, nano silver particles are added into the solution and uniformly dispersed. The solution is heated by microwave heating or electric heating. The heating temperature is 40-100 ℃.
During the heating process, the chemical reaction process is shown in fig. 2.
Finally, the nano silver antistatic agent with the surface modified by the silicon hydroxyl is generated. The nano silver particles are chemically bonded to one of the silicon atoms. Thus, the nano silver particles can be grafted to the polysiloxane branched chains through the silicon hydroxyl groups.
In this example, the conversion rate of the reaction of the nano silver particles with TEOS is high, and the quality of the nano silver antistatic agent with the surface modified with silicon hydroxyl groups is good.
In one example, the co-solvent includes at least one of methanol, ethanol, dioxane, ethylene glycol, glycerol, and acetone. The co-solvent may be selected from any one of the above solvents, or a mixture of two, three, four or more solvents. The cosolvent can effectively improve the solubility of TEOS in deionized water.
In one example, the heating is performed using a microwave reactor. The heating speed of the microwave reactor is high. For example, the power of the microwave reactor is 1-1000W. The heating reaction time is 1-10 minutes. The heating temperature is 40-100 ℃. Under this condition, the conversion rate of the reaction of the nano silver particles and TEOS is high.
According to another embodiment of the present disclosure, there is provided a method for preparing an antistatic silicone rubber material, including:
the nano silver antistatic agent is added into methyl vinyl silicone rubber base rubber and is uniformly mixed.
The preparation method has simple preparation process and easy operation.
In one example, the antistatic silicone rubber material includes a foaming agent and a filler. The blowing agent and filler are as described previously.
In the preparation, firstly, the nano silver antistatic agent is mixed with the filler and the foaming agent. For example, mixing is performed by using a stirring device or an ultrasonic dispersing device to obtain a mixed solution;
then, adding the mixed solution into methyl vinyl silicone rubber base rubber, and uniformly mixing;
finally, setting the vulcanization temperature and the vulcanization time according to the type of the foaming agent and the size of the foam holes to be obtained, and forming by an injection molding mode to prepare the antistatic silicone rubber product.
Alternatively, the vulcanization temperature is 90-150 ℃ and the time is 5-15 minutes. Of course, the molding method of the silicone rubber product is not limited to the above embodiment, and a person skilled in the art may select according to actual needs.
Alternatively, the pH adjustor is a water-miscible material having a pH of greater than 7 and less than 14. The pH adjustor includes, but is not limited to, any one or more of ammonia, sodium hydroxide, and triethanolamine.
The following examples are antistatic silicone rubber materials made using the preparation methods of the present disclosure. One part by mass in the examples is 5g.
Example 1
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas phase white carbon black, the foaming agent is sodium bicarbonate, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s11, 100 parts of methyl vinyl silicone rubber base rubber, 10 parts of gas-phase white carbon black with the viscosity of 600 Pa.s, 5 parts of sodium bicarbonate and 3 parts of nano silver antistatic agent.
S12, premixing the gas-phase white carbon black, sodium bicarbonate and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
And S13, adding the substance obtained in the step S12 into the methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And S14, carrying out injection molding on the substance obtained in the step S13 by an injection molding machine, wherein the injection molding temperature is 100 ℃, and the vulcanization time is 10 minutes, so as to obtain the antistatic silicone rubber product.
Example 2
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black and calcium carbonate, the foaming agent is sodium bicarbonate, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s21, 100 parts of methyl vinyl silicone rubber base rubber, 12 parts of gas-phase white carbon black, 2 parts of calcium carbonate, 2 parts of sodium bicarbonate foaming agent and 5 parts of nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 850 Pa.s.
S22, premixing the gas-phase white carbon black, calcium carbonate, sodium bicarbonate and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
S23, adding the substance obtained in the step S22 into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And S24, carrying out injection molding on the substance obtained in the step S23 by an injection molding machine, wherein the injection molding temperature is 110 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
Example 3
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black and calcium carbonate, the foaming agent is chitosan, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s31, 100 parts of methyl vinyl silicone rubber base rubber, 18 parts of gas-phase white carbon black, 2 parts of calcium carbonate, 1 part of chitosan and 5 parts of nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 300 Pa.s.
S32, premixing the gas-phase white carbon black, calcium carbonate, chitosan and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
S33, adding the mixture obtained in the step S32 into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
S34, carrying out injection molding on the substance obtained in the step S33 by an injection molding machine, wherein the injection molding temperature is 100 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
Example 4
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black, the foaming agent is methyl cellulose, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s41, 100 parts of methyl vinyl silicone rubber base rubber, 20 parts of gas-phase white carbon black, 5 parts of methyl cellulose and 8 parts of nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 800 Pa.s, and the methyl vinyl silicone rubber base rubber is spherical.
S42, premixing the gas-phase white carbon black, the methyl cellulose and the nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
S43, adding the substance obtained in the step S42 into the methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
S44, carrying out injection molding on the substance obtained in the step S43 by an injection molding machine, wherein the injection molding temperature is 150 ℃, and the vulcanization time is 10 minutes, so as to obtain the antistatic silicone rubber product.
Example 5
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas phase white carbon black, the foaming agent is sodium bicarbonate, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s51, 100 parts of methyl vinyl silicone rubber base rubber, 5 parts of gas-phase white carbon black, 1 part of sodium bicarbonate and 15 parts of triangular nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 350 Pa.s.
S52, premixing the gas-phase white carbon black, sodium bicarbonate and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 15 minutes.
And S53, adding the substance obtained in the step S52 into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And S54, carrying out injection molding on the substance obtained in the step S53 by an injection molding machine, wherein the injection molding temperature is 120 ℃, and the vulcanization time is 10 minutes, so as to obtain the antistatic silicone rubber product.
Example 6
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black and calcium carbonate, the foaming agent is chitosan, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s61, 100 parts of methyl vinyl silicone rubber base rubber, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 300 Pa.s, 3 parts of gas-phase white carbon black, 2 parts of calcium carbonate, 5 parts of chitosan and 5 parts of triangular nano silver antistatic agent.
S62, premixing the gas-phase white carbon black, the chitosan foaming agent and the nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
And S63, adding the substance obtained in the step S62 into the methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
S64, carrying out injection molding on the substance obtained in the step S63 by an injection molding machine, wherein the injection molding temperature is 100 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
Example 7
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas phase white carbon black, the foaming agent is sodium bicarbonate, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s71, 100 parts of methyl vinyl silicone rubber base rubber, 5 parts of gas-phase white carbon black, 1 part of sodium bicarbonate and 5 parts of triangular nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 600 Pa.s.
S72, premixing the gas-phase white carbon black, sodium bicarbonate and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
And S73, adding the substance obtained in the step S72 into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And S74, carrying out injection molding on the substance obtained in the step S73 by an injection molding machine, wherein the injection molding temperature is 150 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
Example 8
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black and calcium carbonate, the foaming agent is chitosan, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
s81, 100 parts of methyl vinyl silicone rubber base rubber, 18 parts of gas-phase white carbon black, 2 parts of calcium carbonate, 1 part of chitosan and 5 parts of triangular nano silver antistatic agent, wherein the viscosity of the methyl vinyl silicone rubber base rubber is 200 Pa.s.
S82, premixing the gas-phase white carbon black, sodium bicarbonate and nano silver antistatic agent into the dimethyl silicone oil, and mechanically stirring for 10 minutes.
S83, adding the substance obtained in the step S82 into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And S84, carrying out injection molding on the substance obtained in the step S83 by an injection molding machine, wherein the injection molding temperature is 100 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
Comparative example
The silicone rubber base rubber adopts methyl vinyl silicone rubber base rubber, the filler is gas-phase white carbon black and calcium carbonate, the foaming agent is ammonium bicarbonate, and the cosolvent is dimethyl silicone oil. The method comprises the following specific steps:
SD1, 100 parts of methyl vinyl silicone rubber base rubber, 300 Pa.s of viscosity, 18 parts of gas-phase white carbon black, 2 parts of calcium carbonate and 1 part of ammonium bicarbonate.
SD2, premixing gas-phase white carbon black, sodium bicarbonate and nano silver particles into dimethyl silicone oil, and mechanically stirring for 10 minutes.
SD3, adding the substance obtained in the SD2 step into methyl vinyl silicone rubber base rubber, and mechanically stirring for 20 minutes.
And SD4, carrying out injection molding on the material obtained in the step SD3 by an injection molding machine, wherein the injection molding temperature is 100 ℃, and the vulcanization time is 5 minutes, so as to obtain the antistatic silicone rubber product.
The volume resistivity, cell diameter and drip angle of the antistatic silicone rubber articles of examples 1 to 8 and comparative examples were measured. The measurement data are shown in Table 1.
TABLE 1
As can be seen from table 1, the volume resistivity of the antistatic silicone rubber articles of examples 1 to 8 was significantly lower than that of the comparative example. The lower the volume resistivity, the higher the conductivity; the higher the conductivity is, the easier the electric charge on the surface of the silicone rubber material is led away, so that the antistatic performance of the silicone rubber material is obviously improved.
Further, the anti-static silicone rubber articles of examples 1 to 8 each had a drip angle of less than 90 °, whereas the anti-static silicone rubber articles of comparative examples had a drip angle of more than 90 °, which indicates that the silicone rubber material was changed from hydrophobic to hydrophilic by adding the nano-silver antistatic agent of the examples of the present disclosure. As shown in Table 1, the antistatic silicone rubber articles of examples 1-8 exhibited a dripping angle of 60℃to 90 ℃.
The larger the water dropping angle is, the stronger the hydrophobicity of the silicone rubber material is, and the silicone rubber material is easy to generate electrostatic adsorption, so that dust is adsorbed; the smaller the drip angle, the more hydrophilic the silicone rubber material is, and the silicone rubber material is liable to adhere to dust. The silicon rubber product is not easy to adsorb dust when the water dropping angle is 60-90 degrees.
The surfaces of the silicone rubber articles of examples 1-8 were free of dust or had little dust observed after 10 days of standing. While the surface of the silicone rubber article of the comparative example was adhered with a large amount of dust.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An antistatic silicone rubber material, comprising: the following materials are used in parts by mass,
100 parts of methyl vinyl silicone rubber base rubber; and
1-10 parts of nano silver antistatic agent;
the nano silver antistatic agent comprises nano silver particles with silicon hydroxyl groups modified on the surface, the methyl vinyl silicone rubber base rubber generates a silicone rubber product through a crosslinking reaction, the nano silver antistatic agent is uniformly dispersed in the methyl vinyl silicone rubber base rubber, the silicon hydroxyl groups and the methyl vinyl silicone rubber base rubber are bonded together in the crosslinking reaction process, and the nano silver particles are grafted on a branched chain of polysiloxane;
the preparation method of the nano silver particles with the surface modified with the silicon hydroxyl groups comprises the following steps:
adding tetraethoxysilane, a cosolvent and a pH regulator into deionized water, and keeping the solution alkaline to perform hydrolysis reaction;
adding the nano silver particles into the solution, and uniformly dispersing;
heating the uniformly dispersed solution at 40-100 ℃;
the vulcanization temperature is 90-150 ℃ and the time is 5-15 minutes.
2. The antistatic silicone rubber material according to claim 1, wherein the molar content of vinyl siloxane in the methyl vinyl silicone rubber based rubber is 0.1% -0.4%.
3. The antistatic silicone rubber material according to claim 1, further comprising 10-50 parts of a filler comprising at least one of fumed silica and calcium carbonate.
4. The antistatic silicone rubber material according to claim 1, further comprising 5-12 parts of a foaming agent.
5. The antistatic silicone rubber material according to claim 1, wherein the nano silver particles have a size ranging from 10nm to 100nm.
6. The antistatic silicone rubber material according to claim 1, wherein the viscosity of the silicone rubber-based adhesive is 100 Mpa-s-5000 Mpa-s.
7. The antistatic silicone rubber material according to claim 1, wherein the nano silver particles are at least one of spherical, ellipsoidal, rectangular, triangular.
8. The antistatic silicone rubber material according to claim 1, wherein said co-solvent comprises at least one of methanol, ethanol, dioxane, ethylene glycol, glycerol, and acetone.
9. The antistatic silicone rubber material according to claim 1, wherein a dripping angle of the antistatic silicone rubber material is 60 ° -90 °.
10. A method of preparing the antistatic silicone rubber material as claimed in any one of claims 1 to 9, comprising: the nano silver antistatic agent is added into methyl vinyl silicone rubber base rubber and is uniformly mixed.
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