CN112898782A - Liquid silicone rubber for pad printing rubber head and preparation method thereof - Google Patents
Liquid silicone rubber for pad printing rubber head and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a liquid silicone rubber for a pad printing rubber head and a preparation method thereof, wherein the liquid silicone rubber comprises a component A and a component B, wherein the component A comprises a base rubber, a catalyst and vinyl-terminated polymethylsiloxane; the component B comprises base glue, an inhibitor, color paste, methyl-terminated polymethylhydrosiloxane, gas-phase titanium dioxide, an antistatic auxiliary agent and a solvent-resistant auxiliary agent; the base rubber comprises vinyl terminated polymethylSiloxane, methyl terminated polymethylvinylsiloxane, white carbon black, hexamethyldisilazane and water. White carbon black is in a proportion of 1: 1-10 of mixture of fumed silica and precipitated silica, wherein the specific surface area of the fumed silica is 380-430 m2The specific surface area of the precipitated white carbon black is 150-220 m2(ii) in terms of/g. The liquid silicone rubber for the pad printing rubber head has low viscosity and is easy to defoam, and the prepared pad printing silicone rubber head has the characteristics of static resistance, solvent resistance, long service life, high precision and good inking and ink dropping.
Description
Technical Field
The invention relates to the technical field of silicone rubber, and particularly relates to liquid silicone rubber for a pad printing rubber head and a preparation method thereof.
Background
At present, in the mobile phone printing industry, pad printing is a printing technology for transferring patterns on a steel plate to the surface of an object by using a concave rubber head as an intermediate, and is a main method for printing and decorating a mobile phone screen at present. In the process, a single-rubber-head printing mode is generally adopted, and the printing mode not only has a single printing pattern, but also influences the production efficiency. Nowadays, mobile phone screens begin to develop towards 3D curved screens, and what need be developed therewith is automatic, precise and multi-rubber-head pad printing technologies, and different rubber head designs can be carried out according to different products to be printed by the pad printing technologies, so that liquid silicone rubber for special silicone rubber heads adapted to novel pad printing technologies is urgently needed to be put into production. Generally speaking, the silicone rubber used for manufacturing the pad printing head comprises a condensation type silicone rubber and an addition type silicone rubber, the biggest defects of the condensation type liquid silicone rubber are that the complete vulcanization time is long at room temperature, the production period is long, the efficiency is low, the vulcanization speed needs to be improved by heating or humidifying, but the temperature is not more than 65 ℃, otherwise, the comprehensive performance of the vulcanized rubber is reduced, and the curing mode of the silicone rubber can catalyze the crosslinking reaction of the vulcanized rubber and simultaneously release low molecular products, thereby having adverse effect on the size of the pad printing head. Therefore, the condensation type glue used as the pad printing glue head has larger linear shrinkage rate than the addition type glue, the size of the product is difficult to control, and the requirement of continuously improving the precision in the pad printing process cannot be met. Ordinary addition type silicon rubber is more sensitive to the temperature, can vulcanize fast through the heating, glues first size easy control, nevertheless to in the nonmetal curved surface material bat printing technique of present popular 3D, the gluey head that this silicon rubber was made exists precision not enough, static gathering to electronic components's damage hidden danger, static and printing ink high corrosivity to the life influence of bat printing head, the inking ink drop is more unstable scheduling problem awaits a urgent need to be solved.
The invention with the patent number of CN103408938A elaborates a preparation method of an addition type liquid silicone rubber composition for a pad printing rubber head, the invention utilizes long-chain alkoxy silane to modify precipitated silica white to prepare the liquid silicone rubber for pad printing, but the synergistic effect of the antistatic property and the corrosion resistance of the silicone rubber pad printing rubber head on solving the pad printing precision and the service life of a 3D material is not described, and the related properties and the influence are not researched.
Therefore, there is a need to develop a liquid silicone rubber for a pad printing head and a method for preparing the same to solve the above technical disadvantages.
Disclosure of Invention
The invention aims to provide liquid silicone rubber for a pad printing head, which has the advantages of static resistance, solvent resistance, long service life, high precision and good ink feeding and ink dropping.
The invention also aims to provide a preparation method of the liquid silicone rubber for the pad printing rubber head.
In order to achieve the purpose, the invention discloses liquid silicone rubber for a pad printing rubber head, which comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 1: 1-10, and the components are counted in parts by weight,
the component A comprises 100 parts of base rubber, 0.2-0.5 part of catalyst and 10-40 parts of vinyl-terminated polymethyl siloxane;
the component B comprises 100 parts of base rubber, 0.01-0.3 part of inhibitor, 0.1-1 part of color paste, 1-10 parts of methyl terminated polymethylhydrosiloxane, 5-15 parts of dimethyl silicone oil, 1-5 parts of gas phase titanium dioxide, 0.5-10 parts of antistatic additive and 0.5-10 parts of solvent-resistant additive;
the base adhesive comprises 20-100 parts of vinyl-terminated polymethylsiloxane, 5-10 parts of methyl-terminated polymethylvinylsiloxane, 20-60 parts of white carbon black, 2-20 parts of hexamethyldisilazane and 0.5-5 parts of water, wherein the white carbon black is a mixture of fumed silica and precipitated silica, and the fumed silica and the precipitated white carbon blackThe ratio of black is 1: 1-10, wherein the specific surface area of the fumed silica is 380-430 m2The specific surface area of the white carbon black prepared by the precipitation method is 150-220 m2/g。
Preferably, the viscosity of the vinyl-terminated polymethylsiloxane is 500-100000 cp.
Preferably, the vinyl-terminated polymethylsiloxane used for the base adhesive consists of the vinyl-terminated polymethylsiloxane with a first viscosity and the vinyl-terminated polymethylsiloxane with a second viscosity, and the ratio of the first viscosity to the second viscosity is 10-20: 1.
preferably, the first viscosity is 500-1000 cp, and the second viscosity is 10000-100000 cp.
Preferably, the vinyl-terminated polymethylsiloxane used for the a component consists of the vinyl-terminated polymethylsiloxane having a second viscosity.
Preferably, the viscosity of the methyl-terminated polymethylvinylsiloxane is 500-80000 cp.
Preferably, the inhibitor may be, but is not limited to, 1-ethynylcyclohexanol.
Preferably, the catalyst may be, but is not limited to, a platinum to divinyltetramethylsiloxane coordination compound.
Correspondingly, the application also provides a preparation method of the liquid silicone rubber for the pad printing rubber head, which comprises the following steps:
preparing base rubber: carrying out cold refining on vinyl-terminated polymethylsiloxane, methyl-terminated polymethylvinylsiloxane, white carbon black, hexamethyldisilazane and water, carrying out hot refining at 170 ℃ for 2h, and removing volatile matters in vacuum to obtain base adhesive;
preparation of a component A: mixing and stirring the base adhesive, the catalyst and the vinyl-terminated polymethylsiloxane uniformly, defoaming in vacuum, and filtering to obtain a component A;
b, preparation of a component: mixing and stirring base glue, an inhibitor, color paste, methyl-terminated polymethylhydrosiloxane, gas-phase titanium dioxide, an antistatic auxiliary agent and a solvent-resistant auxiliary agent uniformly, defoaming in vacuum, and filtering to obtain a component B;
and mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
Preferably, the preparation method of the liquid silicone rubber for the pad printing head comprises the following steps:
preparing base rubber: carrying out cold refining on vinyl-terminated polymethylsiloxane, methyl-terminated polymethylvinylsiloxane, white carbon black, hexamethyldisilazane and water, carrying out hot refining at 170 ℃ for 2h, and removing volatile matters in vacuum to obtain base rubber; the vinyl-terminated polymethylsiloxane is composed of the vinyl-terminated polymethylsiloxane with the viscosity of a first viscosity and the vinyl-terminated polymethylsiloxane with the viscosity of a second viscosity, and the ratio of the first viscosity to the second viscosity is 10-20: 1.
preparation of a component A: mixing and stirring the base adhesive, the catalyst and the vinyl-terminated polymethylsiloxane uniformly, defoaming in vacuum, and filtering to obtain a component A; the vinyl-terminated polymethylsiloxane is composed of the vinyl-terminated polymethylsiloxane with the viscosity of a second viscosity.
B, preparation of a component: mixing and stirring base glue, an inhibitor, color paste, methyl-terminated polymethylhydrosiloxane, gas-phase titanium dioxide, an antistatic auxiliary agent and a solvent-resistant auxiliary agent uniformly, defoaming in vacuum, and filtering to obtain a component B;
and mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
Preferably, the antistatic agent and the solvent are mixed to obtain an antistatic agent solution, the antistatic agent solution and the base rubber are uniformly mixed in an internal mixer, and the solvent is removed in vacuum to obtain the antistatic auxiliary agent.
Preferably, the antistatic agent is at least one of an ionic antistatic agent, a non-ionic antistatic agent, an amphoteric antistatic agent and a high-molecular permanent antistatic agent. The polymeric permanent antistatic agent can be, but is not limited to, polybetaine; the anionic antistatic agent may be, but is not limited to, an alkyl salicylate. Preferably, the used antistatic agent is a compound of an anionic antistatic agent and a polymer antistatic agent, and has good compatibility with silica gel, obvious antistatic effect and lasting effect.
Preferably, the solvent-resistant auxiliary agent is mixed with a solvent to obtain a solvent-resistant auxiliary agent solution, the solvent-resistant auxiliary agent solution and the base rubber are uniformly mixed in an internal mixer, and the solvent is removed in vacuum to obtain the solvent-resistant auxiliary agent.
Preferably, the solvent-resistant auxiliary agent is at least one selected from fluorine-containing powder, acrylate and polysilsesquioxane.
Compared with the prior art, in the liquid silicon rubber for the pad printing rubber head, the antistatic auxiliary agent and the solvent-resistant auxiliary agent which are good in compatibility with the silicon rubber are added at the same time, so that the antistatic and corrosion-resistant performances are improved, the service life of the pad printing rubber head is greatly prolonged, and the precision of pad printing is kept. Particularly, the adsorption-transfer capacity of the pad printing head to ink is enhanced by adjusting the type and specific surface area collocation of white carbon black, and the problems of difficult defoaming, too high viscosity and difficult control of ink drop in pad printing in the addition type silicone rubber are solved by combining with vapor-phase titanium dioxide, so that the liquid silicone rubber for the pad printing head has low viscosity and easy defoaming, and the manufactured pad printing head has excellent ink-applying and ink-dropping characteristics.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of liquid silicone rubber for a pad printing head comprises the following steps:
preparing base rubber: 97 parts of vinyl-terminated polymethylsiloxane with the viscosity of 20000cp, 3 parts of methyl-terminated polymethylvinylsiloxane with the viscosity of 30000cp, white carbon black, hexamethyldisilazane and a proper amount of water are subjected to cold refining and hot refining in an internal mixer at the temperature of 170 ℃ to prepare the base rubber. Wherein the white carbon black is 25% of the dosage of the polymethylsiloxane, and the hexamethyldisilazane is white20 percent of the carbon black. The white carbon black is a mixture of fumed white carbon black and precipitated white carbon black, and the ratio of the fumed white carbon black to the precipitated white carbon black is 1:1, the specific surface area of the fumed silica is about 380m2(g) the specific surface area of precipitated silica is about 200m2/g。
Preparation of a component A: 100 parts of base rubber, 0.2 part of catalyst and 20 parts of vinyl-terminated polymethylsiloxane with viscosity of 20000cp are mixed and stirred uniformly, and the component A is prepared by vacuum defoaming and filtering.
B, preparation of a component: 100 parts of base rubber, 0.05 part of inhibitor, 0.5 part of color paste, 5 parts of methyl terminated polymethylhydrosiloxane, 10 parts of dimethyl silicone oil, 5 parts of gas phase titanium dioxide, 1 part of antistatic auxiliary agent and 3 parts of solvent-resistant auxiliary agent are mixed and stirred uniformly, and then the component B is prepared by vacuum defoaming and filtering. Wherein, 20 parts of solvent-resistant auxiliary agent acrylate is dissolved in a mixed solvent of water and ethanol, then the solvent-resistant auxiliary agent acrylate and base rubber are heated and mixed uniformly in an internal mixer according to the proportion of 2:100, and the solvent is removed by heating and vacuumizing to prepare the solvent-resistant auxiliary agent. Mixing 20 parts of antistatic agent alkyl salicylate with 10 parts of water and ethanol mixed solvent to obtain antistatic agent solution, uniformly mixing the antistatic agent solution and 100 parts of base rubber in an internal mixer, heating and vacuumizing to remove the solvent to obtain the antistatic auxiliary agent paste.
And mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
Example 2
A preparation method of liquid silicone rubber for a pad printing head comprises the following steps:
preparing base rubber: 30 parts of vinyl-terminated polymethylsiloxane with the viscosity of 20000cp (first viscosity), 67 parts of vinyl-terminated polymethylsiloxane with the viscosity of 500cp (second viscosity), 3 parts of methyl-terminated polymethylvinylsiloxane with the viscosity of 30000cp, white carbon black, hexamethyldisilazane and a proper amount of water are subjected to cold refining and hot refining in an internal mixer at the temperature of 170 ℃ to prepare the base rubber. Wherein, the white carbon black accounts for 25 percent of the dosage of the polymethylsiloxane, and the hexamethyldisilazane accounts for 20 percent of the dosage of the white carbon black. The white carbon black is a mixture of fumed white carbon black and precipitated white carbon black, and the fumed white carbon blackThe ratio of the carbon black to the precipitated silica is 1:1, the specific surface area of the fumed silica is about 380m2(g) the specific surface area of precipitated silica is about 200m2/g。
Preparation of a component A: 100 parts of base rubber, 0.2 part of catalyst and 20 parts of vinyl-terminated polymethylsiloxane with the viscosity of 500cp (second viscosity) are mixed and stirred uniformly, and the component A is prepared by vacuum defoaming and filtering;
b, preparation of a component: 100 parts of base rubber, 0.05 part of inhibitor, 0.5 part of color paste, 5 parts of methyl terminated polymethylhydrosiloxane, 10 parts of dimethyl silicone oil, 5 parts of gas phase titanium dioxide, 1 part of antistatic auxiliary agent and 3 parts of solvent-resistant auxiliary agent are mixed and stirred uniformly, and then the component B is prepared by vacuum defoaming and filtering. Wherein, 20 parts of solvent-resistant acrylate is dissolved in a mixed solvent of water and ethanol, then the solvent-resistant acrylate and base rubber are heated and mixed uniformly in an internal mixer according to the proportion of 2:100, and the solvent is removed by vacuumizing to obtain the solvent-resistant auxiliary agent. Mixing 20 parts of antistatic agent alkyl salicylate with 10 parts of water and ethanol mixed solvent to obtain antistatic agent solution, uniformly mixing the antistatic agent solution and 100 parts of base rubber in an internal mixer, heating and vacuumizing to remove the solvent to obtain the antistatic auxiliary agent paste.
And mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
Example 3
A preparation method of liquid silicone rubber for a pad printing head comprises the following steps:
preparing base rubber: 40 parts of vinyl-terminated polymethylsiloxane with the viscosity of 10000cp (first viscosity), 57 parts of vinyl-terminated polymethylsiloxane with the viscosity of 1000cp (second viscosity), 3 parts of methyl-terminated polymethylvinylsiloxane with the viscosity of 50000cp, white carbon black, hexamethyldisilazane and a proper amount of water are subjected to cold refining and hot refining in an internal mixer at the temperature of 170 ℃ to prepare the base rubber. Wherein, the white carbon black accounts for 25 percent of the dosage of the polymethylsiloxane, and the hexamethyldisilazane accounts for 20 percent of the dosage of the white carbon black. The white carbon black is a mixture of fumed white carbon black and precipitated white carbon black, and the ratio of the fumed white carbon black to the precipitated white carbon black is 1: 5, the specific surface area of the fumed silica is about 380m2The specific surface area of precipitated silica is about 150m2/g。
Preparation of a component A: 100 parts of base rubber, 0.4 part of catalyst and 20 parts of vinyl-terminated polymethylsiloxane with the viscosity of 1000cp (second viscosity) are mixed and stirred uniformly, and the component A is prepared by vacuum defoaming and filtering.
B, preparation of a component: 100 parts of base rubber, 0.1 part of inhibitor, 0.5 part of color paste, 7 parts of methyl-terminated polymethylhydrosiloxane, 10 parts of dimethyl silicone oil, 2 parts of gas-phase titanium dioxide, 3 parts of antistatic auxiliary agent and 5 parts of solvent-resistant auxiliary agent are mixed and stirred uniformly, and then the component B is prepared by vacuum defoaming and filtering. Wherein 100 parts of base rubber and 20 parts of solvent-resistant fluorine-containing micro powder are heated and mixed uniformly in an internal mixer, and are ground by three rollers to prepare the solvent-resistant auxiliary agent paste. Mixing 20 parts of macromolecular permanent antistatic agent polybetaine and 30 parts of mixed solvent of water and ethanol to obtain antistatic agent solution, uniformly mixing the antistatic agent solution and 100 parts of base rubber in an internal mixer, heating and vacuumizing to remove the solvent to obtain the antistatic auxiliary agent paste.
And mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
Comparative examples 1 to 9
Comparative examples 1 to 9 are basically the same as example 1, but are different from example 1 in the components and specific surface area of the white carbon black in comparative examples 1 to 9, and specifically, see table 1.
TABLE 1 Components and specific surface areas of white carbon black in comparative examples 1 to 9 and example 1, and test results
Comparative example 10
Comparative example 10 is substantially the same as example 1 except that comparative example 10 does not contain an antistatic aid, and example 1 contains an antistatic aid, and the rest is the same as example 1 and will not be described again.
Comparative example 11
Comparative example 11 is substantially the same as example 1 except that comparative example 11 does not contain a solvent-resistant auxiliary, whereas example 1 contains a solvent-resistant auxiliary, and the rest is the same as example 1 and will not be described again.
Comparative example 12
Comparative example 12 is substantially the same as example 1 except that comparative example 12 contains neither an antistatic aid nor a solvent-resistant aid, whereas example 1 contains both a solvent-resistant aid and an antistatic aid, and the rest is the same as example 1 and will not be described again.
Comparative example 13
Comparative example 13 is substantially the same as example 1 except that comparative example 13 does not contain fumed titania and example 1 contains fumed titania, and the rest is the same as example 1 and will not be described again.
According to the transfer printing rubber head prepared from the liquid silicone rubber, in the transfer printing process of the 3D non-metal curved screen, the transfer printing rubber head forms a pattern by adsorbing printing ink on a gravure plate, and then transfers the pattern to a printing stock. In the process of absorbing and transferring ink, the pad printing rubber head is required to have better pad printing performance, good mechanical property, excellent rebound resilience and proper antistatic resistance value. For this purpose, performance tests were carried out as shown in table 2.
The test items and methods are as follows:
service life: the number of pad prints is measured, and the greater the number of pad prints, the longer the life span is indicated.
Transfer printing performance: and (4) judging by detecting the thickness of the dry ink layer after pad printing and the light transmission condition of the screen.
Viscosity: the viscosity at a certain temperature was measured using a digital viscometer.
Mechanical properties: and testing the mechanical property by using a computer type material tensile testing machine.
Defoaming property: and (3) taking a graduated wide-range measuring cylinder, pouring the graduated rubber material into the graduated wide-range measuring cylinder for vacuum defoaming, and recording the foam breaking graduation and the complete defoaming time.
TABLE 2 test results
| Number of transfer printing | Transfer printing performance | Viscosity/cp, 25 deg.C | Mechanical properties | Defoaming property/min | |
| Example 1 | About 4500 times | OK | 31452 | OK | 18 |
| Example 2 | About 4300 times | OK | 21085 | OK | 15 |
| Example 3 | About 4300 times | OK | 22315 | OK | 16 |
| Comparative example 1 | NG | Poor inking and incomplete pattern | 25326 | OK | 18 |
| Comparative example 2 | NG | Poor inking, thin ink layer | 27350 | OK | 18 |
| Comparative example 3 | NG | Poor inking, ink layer transmission | 28967 | OK | 19 |
| Comparative example 4 | NG | Poor inking, thin ink layer | 28562 | OK | 32 |
| Comparative example 5 | About 4500 times | OK | 45867 | OK | 35 |
| Comparative example 6 | About 4500 times | OK | 78956 | OK | 35 |
| Comparative example 7 | About 4500 times | OK | 79563 | OK | 35 |
| Comparative example 8 | NG | Thin ink layer, residual ink of rubber head | 98751 | OK | 38 |
| Comparative example 9 | NG | Thin ink layer, residual ink of rubber head | 103520 | OK | 38 |
| Comparative example 10 | 250 | Less transfer printing times and wire drawing | 30452 | OK | 18 |
| Comparative example 11 | 800 | Less transfer printing times and light transmission | 32156 | OK | 17 |
| Comparative example 12 | 200 | Less transfer printing times and wire drawing | 30251 | OK | 18 |
| Comparative example 13 | About 3500 times | Reduction of pad printing times | 29182 | OK | 25 |
As can be seen from the data in Table 2, the liquid silicone rubber prepared in the embodiments 1 to 3 of the present invention has the characteristics of low viscosity and easy defoaming, and the prepared pad printing heads have the characteristics of excellent ink-feeding and ink-dropping pad printing effects, good mechanical properties and long service life, and are very suitable for pad printing.
Example 1 compared with example 2, it is clear that the disadvantage of a higher viscosity can be avoided by using a combination of two vinyl-terminated polymethylsiloxanes having different viscosities (a first viscosity and a second viscosity, wherein the first viscosity is higher and the second viscosity is lower).
In example 1, compared with comparative examples 1 to 9, it can be seen that the white carbon black is a mixture of fumed silica and precipitated silica, and the types and specific surface areas of the fumed silica and the precipitated silica are adjustedThe adsorption-transfer capacity of the silicone rubber to the printing ink is enhanced, and the printing performance of the prepared pad printing rubber head reaches an ideal state. The silica white prepared by the precipitation method alone has poor adsorption capacity of the silicone rubber to printing ink, and is easy to cause transfer printing pattern defects or fullness; the larger the specific surface area of the white carbon black is, the finer the surface is, the stronger the ink adsorption capacity is, but the use of the fumed silica with high specific surface area is easy to cause defoaming difficulty in a forming process, too large viscosity and poor ink drop effect in pad printing, so that the specific surface area is required to be 150-220 m2The specific surface area of the precipitated silica is 380-430 m2The white carbon black of the gas phase method per gram is used for solving the defects.
Compared with the comparative examples 10 to 12, the example 1 shows that the service life of the pad printing rubber head is not obviously prolonged when the solvent-resistant auxiliary agent is added alone, and the service life of the pad printing rubber head is obviously prolonged after the antistatic auxiliary agent is added, but the service life of the pad printing rubber head is still not ideal and cannot meet the ideal service life requirement. After the antistatic additive and the solvent-resistant additive are added at the same time, the service life of the pad printing rubber head is greatly prolonged under the synergistic action of the antistatic additive and the solvent-resistant additive. The reasons may be: when the pad printing rubber head starts to print, the material of the pad printing rubber head has pad printing performance, and along with the printing, the action of static starts to interfere the printing effect to cause the phenomena of wire drawing, burrs and the like to appear, the static resistant auxiliary agent can overcome the static influence in the process, after the pad printing rubber head is used for a long time, the surface of the pad printing rubber head is damaged due to corrosion, so that the pattern can not be printed due to incomplete printing and light transmission, at the moment, the solvent resistant auxiliary agent can improve the defect, and the service life of the pad printing rubber head can be greatly prolonged.
Example 1 compared with comparative example 13, it can be seen that the vapor phase process titanium dioxide is a nano-scale filler, has a reinforcing effect and a large specific gravity, so that bubbles formed in the molding process are more easily broken by gravity.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. The liquid silicone rubber for the pad printing rubber head is characterized by comprising a component A and a component B, wherein the weight ratio of the component A to the component B is 1: 1-10, calculated by weight,
the component A comprises 100 parts of base rubber, 0.2-0.5 part of catalyst and 10-40 parts of vinyl-terminated polymethyl siloxane;
the component B comprises 100 parts of base rubber, 0.01-0.3 part of inhibitor, 0.1-1 part of color paste, 1-10 parts of methyl terminated polymethylhydrosiloxane, 5-15 parts of dimethyl silicone oil, 1-5 parts of gas phase titanium dioxide, 0.5-10 parts of antistatic additive and 0.5-10 parts of solvent-resistant additive;
the base adhesive comprises 20-100 parts of vinyl-terminated polymethylsiloxane, 5-10 parts of methyl-terminated polymethylvinylsiloxane, 20-60 parts of white carbon black, 2-20 parts of hexamethyldisilazane and 0.5-5 parts of water, the white carbon black is a mixture of fumed silica and precipitated silica, and the ratio of the fumed silica to the precipitated silica is 1: 1-10, wherein the specific surface area of the fumed silica is 380-430 m2The specific surface area of the white carbon black prepared by the precipitation method is 150-220 m2/g。
2. The liquid silicone rubber for a pad printing head according to claim 1, wherein the viscosity of the vinyl-terminated polymethylsiloxane is 500 to 100000 cp.
3. The liquid silicone rubber for a pad printing head according to claim 2, wherein the vinyl terminated polymethylsiloxane used for the base rubber is composed of the vinyl terminated polymethylsiloxane having a first viscosity and the vinyl terminated polymethylsiloxane having a second viscosity, and a ratio of the first viscosity to the second viscosity is 10 to 20: 1.
4. the liquid silicone rubber for a pad printing head according to claim 3, wherein said vinyl terminated polymethylsiloxane used for said A component consists of said vinyl terminated polymethylsiloxane having a second viscosity.
5. The liquid silicone rubber for a pad printing head according to claim 1, wherein the viscosity of the methyl-terminated polymethylvinylsiloxane is 500 to 80000 cp.
6. A method for preparing the liquid silicone rubber for a pad printing head according to any one of claims 1 to 5, comprising the steps of:
preparing base rubber: vinyl-terminated polymethylsiloxane, methyl-terminated polymethylvinylsiloxane, white carbon black, hexamethyldisilazane and water are refined through cold refining and hot refining processes to obtain base rubber;
preparation of a component A: mixing and stirring the base adhesive, the catalyst and the vinyl-terminated polymethylsiloxane uniformly, defoaming in vacuum, and filtering to obtain a component A;
b, preparation of a component: mixing and stirring base glue, an inhibitor, color paste, methyl-terminated polymethylhydrosiloxane, gas-phase titanium dioxide, an antistatic auxiliary agent and a solvent-resistant auxiliary agent uniformly, defoaming in vacuum, and filtering to obtain a component B;
and mixing the component A and the component B, and heating and curing in a mold to obtain the silicone rubber for pad printing.
7. The method for preparing liquid silicone rubber for a pad printing head according to claim 6, wherein the antistatic auxiliary is prepared by mixing an antistatic agent with a solvent to obtain an antistatic agent solution, uniformly mixing the antistatic agent solution with the base rubber in an internal mixer, and removing the solvent in vacuum.
8. The method for preparing a liquid silicone rubber for a pad printing head according to claim 7, wherein the antistatic agent is at least one of an ionic antistatic agent, a non-ionic antistatic agent, an amphoteric antistatic agent, and a polymeric permanent antistatic agent.
9. The method for preparing a liquid silicone rubber for a pad printing head according to claim 6, wherein the solvent-resistant auxiliary is prepared by mixing a solvent-resistant auxiliary with a solvent to obtain a solvent-resistant auxiliary solution, uniformly mixing the solvent-resistant auxiliary solution with the base rubber in an internal mixer, and removing the solvent in vacuum.
10. The method of preparing a liquid silicone rubber for a pad printing head according to claim 9, wherein the solvent-resistant auxiliary is at least one selected from the group consisting of fluorine-containing powder, acrylate, and polysilsesquioxane.
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Effective date of registration: 20221214 Address after: No. 108, Mazongling Road, Xiaoting District, Yichang City, Hubei Province, 443007 Patentee after: Hubei Zheng'an New Materials Co.,Ltd. Address before: 523000 building B3, Xicheng phase II, Hengli Town, Dongguan City, Guangdong Province Patentee before: DONGGUAN GENVAN SILICONE TECHNOLOGY CO.,LTD. |