CN101066552A - Silica gel mold material for casting metal ornament and its application - Google Patents
Silica gel mold material for casting metal ornament and its application Download PDFInfo
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Abstract
The silicone rubber mold material for casting metal ornament consists of polysiloxane with vinyl radical 100 weight portions, reinforcing agent 10-80 weight portions, heat conducting assistant 5-30 weight portions, heat resisting assistant 0.3-5 weight portions and vulcanizing agent 0.5-5 weight portions. The mold of the material has high heat conductivity, high heat resistance, less temperature raise, and long service life. In addition, the mold is light and has easy demolding of the metal ornament.
Description
Technical field
The present invention relates to a kind of silicon rubber mould, especially a kind of silica gel mold material for casting metal ornament and application thereof.
Background technology
Usually the metal decoration that has given shape as hair clip or brooch, is by the melt cast of metal decoration raw material low-melting point metal alloy being gone into to have the mould of designated shape, making behind the cooling curing.Generally, the mould that adopts the metal material making is as metal decoration moulding by casting mould, and this mould is to make it have designated shape by metal is processed, its production cost height, and existence is focused on and unworkable problem.In addition, the reciprocal variation from room temperature to the casting of metals temperature can make the metal die distortion.
The liquid silastic of succeeding in developing the second half in 20th century has excellent emulation, release property and extremely low shrinkage factor, and characteristics such as machine-shaping is convenient, becomes a kind of good mold materials.Many processing and forming field adopts liquid silastic to replace metal or other material manufacturing work mould one after another.Silicon rubber mould has been widely used in fields such as high frequency embossing process hides shoemaking, the reproduction of the cultural relics, plastic shaping, hot investment casting, mechanical mapping and gypsum, low-melting point metal alloy moulding at present.
But the metal bath temperature is up to 350-400 ℃ in some metal alloy moulding by casting process, and the hear resistance of liquid silastic mould does not reach requirement.High-temperature silicon disulfide rubber has higher heat-resistant stability than liquid silastic, has good emulation and release property simultaneously, therefore can be used as low-melting point metal alloy ornaments casting mold material.
With high temperature vulcanized polysiloxanes is primary raw material, by cooperating reinforcing agent, peroxide vulcanizing agent and other additive,, can make metal decoration moulding by casting mould easily through process such as mixing, moulding, high temperature vulcanized, therefore, the production cost of this mould is low.
Since silicon rubber mould be heated in the use repeatedly, oxygen and mechanical fatigue effect, its physical and mechanical properties is reduced gradually, variable color appears in the surface, sclerosis becomes fragile, cause the crack, and the generation fractionlet, thereby influencing the attractive in appearance of metal decoration, final mould loses use value.
High-temperature silicon disulfide rubber can only use 300 ℃ of following short-terms, its reason is because the oxidation reaction that silicon rubber generation main chain is separated button degraded and side chain during high temperature, therefore the service life of high-temperature silicon disulfide rubber mould is shorter in metal alloy moulding by casting process, replacing frequency height, production efficiency is low, and the scrap rubber mould recycling difficulty after using causes the wasting of resources and environmental pollution.By adding heat resistance accessory, suppress the oxidation reaction that polysiloxane backbone is separated button degraded and side chain, can improve the hear resistance of organic silicon rubber, prolong the service life of silicon rubber mould.
In addition, compare with metal material, the thermal conductivity of organic silicon rubber is relatively poor, its thermal conductivity factor generally has only 0.16W/ (mK), can not be dispersed into liberated heat in the metal decoration moulding by casting solidification process effectively and quickly in the surrounding environment, influence the quality of ornaments and the service life of production efficiency and mould.
Summary of the invention
The invention provides a kind of have good hear resistance, thermal conductivity, the silica gel mold material for casting metal ornament of light and easy operating.
A kind of silica gel mold material for casting metal ornament, raw material comprises in weight portion: have 100 parts of the polysiloxanes of vinyl, 10～80 parts of reinforcing agents, 5～30 parts of heat conduction auxiliary agents, 0.3～5 part of heat resistance accessory, 0.5～5 part of vulcanizing agent.
At least a in poly-ethylene methacrylic radical siloxane or the polymethyl-benzene base vinylsiloxane of the described polysiloxanes that has a vinyl.The mole percent level of vinylsiloxane chain link is 0.05-0.50% in the described polysiloxanes that has a vinyl, preferred 0.08-0.40%.
The polysiloxanes that has vinyl can be selected common commercially available prod for use, and the 110-2 methyl vinyl silicone rubber of Chengdu organosilicon research institute etc. all can adopt.
Intensity without the polysiloxanes of reinforcement is relatively poor, needs to add various granular reinforcing agents.Aerosil, precipitated silica, silica flour, diatomite, glass microsphere, iron oxide, zinc oxide, titanium dioxide, magnesia, talcum, alumina silicate, aluminium oxide, calcium carbonate, carbon black all can be used as reinforcing agent or semi-reinforcing agent.
The polysiloxanes that has vinyl of 100 weight portions uses reinforcing agent 10 to 80 weight portions, preferred 15 to 70 weight portions, most preferably 20 to 60 weight portions.
Silica filler such as aerosil or precipitated silica have excellent enhancement effect, and recording its specific area with the BET absorption method is 50-400m
2/ g is preferably 100-350m
2/ g, and its surface is unprocessed or handled with organosilicon, all is desirable organo-silicon compound as chlorosilane, alkoxy silane, silazane.When using undressed reinforcing agent such as precipitated silica, can use constitution controller in the mixing silicon rubber process, precipitated silica to be handled, with processing performance, storage stability and the physical and mechanical properties of improving sizing material.Diphenyl silanediol, low-molecular-weight hydroxyl silicone oil, contain at least a constitution controller that can be used as in the organosilan of alkoxyl.
Metal decoration moulding by casting mould for silicon rubber is made because its rigidity is relatively poor, therefore is necessary to do mould thicker.When thickness increases, the difficulty because the even cooling of thermal conductivity variation and metal decoration raw material becomes, therefore the thermal conductivity of used silicon rubber is extremely important.The heat conduction auxiliary agent can be regulated the thermal conductivity of silicon rubber, and as the heat conduction auxiliary agent that is used to improve thermal conductivity, the heat conduction auxiliary agent can adopt metal dust, graphite, aluminium oxide, aluminium nitride and boron nitride.For metal decoration moulding by casting mould, it is desirable to adopt thermal conductivity is 0.17-0.40W/m ℃ silicon rubber.When thermal conductivity is lower than 0.17W/m ℃, poor thermal conduction.And when forcing to improve thermal conductivity, can increase the consumption of filler, and have influence on the physical property of silicon rubber, mould is broken in actual applications.
In metal decoration moulding by casting process, owing to silicon rubber mould is exposed under the higher temperature in the repeated use process repeatedly, so the heat resistance of silicon rubber is also very important.Can as heat resistance accessory be the compound of transition metal, at least a as in transition metal soap, transition metal silane alkoxide or the transition metal oxide.The compound of this type of transition metal has variable valence state, can eliminate free radical.The soap of transition metal such as iron octoate, cerium octoate or titanium propanolate compound; Transition metal silane alkoxide is as the silanol molysite; Transition metal oxide such as iron oxide or titanium oxide.
The vulcanizing agent that uses in containing the vinyl polysiloxane is peroxide, dibenzoyl peroxide, 2 for example, 4-dichlorobenzoperoxide, peroxidized t-butyl perbenzoate, di-t-butyl peroxide, cumyl peroxide or 2,5-dimethyl-2, at least a in the 5-di-t-butyl hexane peroxide.Preferred di-t-butyl peroxide, cumyl peroxide or 2,5-dimethyl-2,5-di-t-butyl hexane peroxide.The peroxide decomposes produces free radical, makes the polysiloxanes sulfuration that contains vinyl by radical reaction.
Method with silicon rubber mould material preparation mould of the present invention is: with kneader that each component is mixing evenly, resulting mixture is passed through the compression molding forming machine moulding, and at 120～180 ℃ of heating and press cure, carry out post vulcanization at 180～210 ℃ then, remove the small-molecule substance that produces in the sulfidation.
Hardness, percentage elongation and the modulus of silicon rubber (being added with auxiliary agent) that is used for preparing mould is all influential to the non-deformability of silicon rubber.The distortion of control silicon rubber can realize by the hardness that improves silicon rubber.The hardness of silicon rubber is subjected to the influence of polysiloxanes rubber kind, vulcanizing agent kind, additive types or its blending ratio, and can change the hardness of silicon rubber by regulating above-mentioned factor.For the metal decoration moulding by casting mould that silicon rubber is made, wish that adopting Shore A hardness is that 40-70 (Shore A hardness measures the hardness of rubber) preferred hardness is the silicon rubber of 50-65.Shore A hardness is less than 40 silicon rubber, and mould is easy to distortion.Shore A hardness surpasses 70 silicon rubber, because its percentage elongation reduces, therefore is difficult to distortion, easily makes mould occur breaking in the metal decoration process repeating to take out.In addition, but be not in order to limit, the used silicon rubber of the present invention is characterised in that desirable fracture elongation is 400-650%.
Metal decoration moulding by casting of the present invention has good thermal conductivity with mould, can reduce the temperature rise of mold materials and the degraded of initiation thus, can prolong the service life of silicon rubber.In addition, the light and easy operating of this mold weight, metal decoration can remove from mould very wellly.
The specific embodiment
Embodiment 1
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 30 parts of specific areas
2The aerosil of/g mixes, and mixes with the heat conduction auxiliary agent aluminium oxide of 20.0 weight portions and the heat resistance accessory cerium oxide of 0.5 weight portion then, mixes with the vulcanizing agent di-t-butyl peroxide of 3.5 weight portions again, obtains mold materials.
With the compression molding 20 minutes under 160 ℃, 5MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 51; Percentage elongation is 550%; Thermal conductivity is 0.34W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 55%.
Embodiment 2
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.65% dimethyl siloxane units and 0.35% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 40 parts of specific areas
2The aerosil of/g, 10 parts of calcium carbonate mix, and mix with the heat conduction auxiliary agent aluminium nitride of 5 weight portions and the heat resistance accessory cerium octoate of 0.5 weight portion then, mix with the vulcanizing agent cumyl peroxide of 2 weight portions again, obtain mold materials.
With the compression molding 10 minutes under 170 ℃, 10MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 60; Percentage elongation is 500%; Thermal conductivity is 0.20W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 63%.
Embodiment 3
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 20 parts of specific areas
2The aerosil of/g mixes, mixes with the heat conduction auxiliary agent graphite of 30 weight portions and the heat resistance accessory iron oxide of 3 weight portions then, and again with the vulcanizing agent 2 of 0.5 weight portion, 5-dimethyl-2, the mixing of 5-di-t-butyl hexane peroxide obtains mold materials.
With the compression molding 8 minutes under 180 ℃, 8MPa of this mold materials, 200 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 50; Percentage elongation is 570%; Thermal conductivity is 0.39W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 78%.
Embodiment 4
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.65% dimethyl siloxane units and 0.35% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 30 parts of specific areas
2The aerosil of/g, 20 parts of imvites mix, and mix with the heat conduction auxiliary agent carbon black of 5 weight portions and the heat resistance accessory cerium octoate of 5 weight portions then, mix with the vulcanizing agent di-t-butyl peroxide of 3.5 weight portions again, obtain mold materials.
With the compression molding 25 minutes under 150 ℃, 10MPa of this mold materials, 190 ℃ of following post vulcanizations 3 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 55; Percentage elongation is 480%; Thermal conductivity is 0.22W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 80%.
Embodiment 5
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 30 parts of specific areas
2The precipitated silica of/g is mixed, and mixes with the heat conduction auxiliary agent aluminium nitride of 20 weight portions and the heat resistance accessory iron oxide of 0.5 weight portion then, mixes with the vulcanizing agent cumyl peroxide of 2 weight portions again, obtains mold materials.
With the compression molding 30 minutes under 140 ℃, 8MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 52; Percentage elongation is 540%; Thermal conductivity is 0.33W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 54%.
Embodiment 6
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 40 parts of specific areas
2The precipitated silica of/g, 10 parts of calcium carbonate mix, mix with the heat conduction auxiliary agent aluminium oxide of 5 weight portions and the heat resistance accessory cerium oxide of 1.5 weight portions then, again with the vulcanizing agent 2 of 0.5 weight portion, 5-dimethyl-2, the 5-di-t-butyl hexane peroxide mixes, and obtains mold materials.
With this mold materials and compression molding 15 minutes under 160 ℃, 7MPa, 180 ℃ of following post vulcanizations 5 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 62; Percentage elongation is 490%; Thermal conductivity is 0.22W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 61%.
Embodiment 7
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 20 parts of specific areas
2The precipitated silica of/g is mixed, and mixes with the heat conduction auxiliary agent carbon black of 30 weight portions and the heat resistance accessory iron oxide of 2 weight portions then, mixes with the vulcanizing agent di-t-butyl peroxide of 1.5 weight portions again, obtains mold materials.
With this mold materials and compression molding 15 minutes under 170 ℃, 10MPa, 200 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 50; Percentage elongation is 570%; Thermal conductivity is 0.40W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 76%.
Embodiment 8
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 99.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 30 parts of specific areas
2The precipitated silica of/g, 20 parts of imvites mix, and mix with the heat conduction auxiliary agent graphite of 5 weight portions and the heat resistance accessory cerium octoate of 5 weight portions then, mix with the vulcanizing agent cumyl peroxide of 2.5 weight portions again, obtain mold materials.
With the compression molding 8 minutes under 180 ℃, 8MPa of this mold materials, 190 ℃ of following post vulcanizations 3 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 56; Percentage elongation is 470%; Thermal conductivity is 0.23W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 79%.
Embodiment 9
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 20% methyl phenyl siloxane unit, 79.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 30 parts of specific areas
2The aerosil of/g mixes, mixes with the heat conduction auxiliary agent aluminium oxide of 20 weight portions and the heat resistance accessory iron oxide of 0.5 weight portion then, and again with the vulcanizing agent 2 of 3.5 weight portions, 5-dimethyl-2, the mixing of 5-di-t-butyl hexane peroxide obtains mold materials.
With the compression molding 15 minutes under 160 ℃, 5MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 52; Percentage elongation is 530%; Thermal conductivity is 0.35W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 60%.
Embodiment 10
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 12% methyl phenyl siloxane unit, 87.65% dimethyl siloxane units and 0.35% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 40 parts of specific areas
2The aerosil of/g, 10 parts of calcium carbonate mix, and mix with the heat conduction auxiliary agent aluminium nitride of 5 weight portions and the heat resistance accessory cerium octoate of 0.5 weight portion then, mix with the vulcanizing agent di-t-butyl peroxide of 2 weight portions again, obtain mold materials.
With the compression molding 10 minutes under 170 ℃, 10MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 62; Percentage elongation is 490%; Thermal conductivity is 0.21W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 67%.
Embodiment 11
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 5% methyl phenyl siloxane unit, 94.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 20 parts of specific areas
2The aerosil of/g mixes, and mixes with the heat conduction auxiliary agent graphite of 30 weight portions and the heat resistance accessory iron oxide of 3 weight portions then, mixes with the vulcanizing agent cumyl peroxide of 0.5 weight portion again, obtains mold materials.
With the compression molding 8 minutes under 180 ℃, 8MPa of this mold materials, 200 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 52; Percentage elongation is 560%; Thermal conductivity is 0.39W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 82%.
Embodiment 12
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 20% methyl phenyl siloxane unit, 79.65% dimethyl siloxane units and 0.35% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 200m at first with 30 parts of specific areas
2The aerosil of/g, 20 parts of imvites mix, mix with the heat conduction auxiliary agent carbon black of 5 weight portions and the heat resistance accessory cerium octoate of 5 weight portions then, again with the vulcanizing agent 2 of 3.5 weight portions, 5-dimethyl-2, the 5-di-t-butyl hexane peroxide mixes, and obtains mold materials.
With the compression molding 20 minutes under 150 ℃, 10MPa of this mold materials, 190 ℃ of following post vulcanizations 3 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 56; Percentage elongation is 470%; Thermal conductivity is 0.22W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 86%.
Embodiment 13
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 12% methyl phenyl siloxane unit, 87.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 30 parts of specific areas
2The precipitated silica of/g is mixed, and mixes with the heat conduction auxiliary agent aluminium nitride of 20 weight portions and the heat resistance accessory cerium oxide of 0.5 weight portion then, mixes with the vulcanizing agent di-t-butyl peroxide of 2 weight portions again, obtains mold materials.
With the compression molding 30 minutes under 140 ℃, 8MPa of this mold materials, 180 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 54; Percentage elongation is 520%; Thermal conductivity is 0.34W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 60%.
Embodiment 14
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 5% methyl phenyl siloxane unit, 94.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 40 parts of specific areas
2The precipitated silica of/g, 10 parts of calcium carbonate mix, and mix with the heat conduction auxiliary agent aluminium oxide of 5 weight portions and the heat resistance accessory cerium octoate of 1.5 weight portions then, mix with the vulcanizing agent cumyl peroxide of 0.5 weight portion again, obtain mold materials.
With the compression molding 15 minutes under 160 ℃, 7MPa of this mold materials, 180 ℃ of following post vulcanizations 5 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 63; Percentage elongation is 470%; Thermal conductivity is 0.22 W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 65%.
Embodiment 15
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 5% diphenyl siloxane unit, 79.88% dimethyl siloxane units and 0.12% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 20 parts of specific areas
2The precipitated silica of/g is mixed, mixes with the heat conduction auxiliary agent carbon black of 30 weight portions and the heat resistance accessory cerium oxide of 2 weight portions then, and again with the vulcanizing agent 2 of 1.5 weight portions, 5-dimethyl-2, the mixing of 5-di-t-butyl hexane peroxide obtains mold materials.
With the compression molding 15 minutes under 170 ℃, 10MPa of this mold materials, 200 ℃ of following post vulcanizations 4 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 52; Percentage elongation is 560%; Thermal conductivity is 0.40W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 81%.
Embodiment 16
To the poly-ethylene methacrylic radical siloxane of 100 weight portions (by the trimethicone end-blocking, and make by 12% diphenyl siloxane unit, 87.77% dimethyl siloxane units and 0.23% methyl vinyl siloxane unit) in, in kneader, mixing with following material respectively under the room temperature: be 150m at first with 30 parts of specific areas
2The precipitated silica of/g, 20 parts of imvites mix, and mix with the heat conduction auxiliary agent graphite of 5 weight portions and the heat resistance accessory cerium octoate of 5 weight portions then, mix with the vulcanizing agent di-t-butyl peroxide of 2.5 weight portions again, obtain mold materials.
With the compression molding 8 minutes under 180 ℃, 8MPa of this mold materials, 190 ℃ of following post vulcanizations 3 hours, can make metal decoration moulding by casting mould then.The metal decoration moulding by casting that makes has following physical property with mould: Shore A hardness is 58; Percentage elongation is 460%; Thermal conductivity is 0.24W/m ℃; At 350 ℃ of down aging 1h after-drawing strength retentions is 85%.
Claims (8)
1, a kind of silica gel mold material for casting metal ornament is characterized in that, raw material comprises in weight portion: 100 parts of polysiloxanes that have vinyl, 10～80 parts of reinforcing agents, 5～30 parts of heat conduction auxiliary agents, 0.3～5 part of heat resistance accessory, 0.5～5 part of vulcanizing agent.
2, silica gel mold material for casting metal ornament as claimed in claim 1 is characterized in that: at least a in poly-ethylene methacrylic radical siloxane or the polymethyl-benzene base vinylsiloxane of the described polysiloxanes that has a vinyl.
3, silica gel mold material for casting metal ornament as claimed in claim 1 is characterized in that: the molar content of vinylsiloxane chain link is 0.05～0.50% in the described polysiloxanes that has a vinyl.
4, silica gel mold material for casting metal ornament as claimed in claim 1, it is characterized in that: described reinforcing agent is aerosil, precipitated silica, also adopt some half reinforced fillings and increment filler, at least a as in silica flour, diatomite, glass microsphere, iron oxide, zinc oxide, titanium dioxide, magnesia, talcum powder, alumina silicate, aluminium oxide, calcium carbonate or the carbon black.
5, silica gel mold material for casting metal ornament as claimed in claim 1 is characterized in that: described heat conduction auxiliary agent is at least a in carbon black, metal dust, graphite, aluminium oxide, aluminium nitride or the boron nitride.
6, silica gel mold material for casting metal ornament as claimed in claim 1, it is characterized in that: described vulcanizing agent is a dibenzoyl peroxide, 2,4-dichlorobenzoperoxide, peroxidized t-butyl perbenzoate, di-t-butyl peroxide, cumyl peroxide or 2,5-dimethyl-2, at least a in the 5-di-t-butyl hexane peroxide.
7, silica gel mold material for casting metal ornament as claimed in claim 1 is characterized in that: described heat resistance accessory is at least a in soap, transition metal silane alkoxide or the transition metal oxide of transition metal.
8, the method for preparing mould of silica gel mold material for casting metal ornament as claimed in claim 1, it is characterized in that: each component is mixing evenly with kneader, resulting mixture is passed through the compression molding forming machine moulding, and under 120～180 ℃, heat and press cure, carry out post vulcanization at 180～210 ℃ then, remove the small-molecule substance that produces in the sulfidation.
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| CNB2007100690543A CN100450665C (en) | 2007-06-11 | 2007-06-11 | Silica gel mold material for casting metal ornament and its application |
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| CNB2007100690543A CN100450665C (en) | 2007-06-11 | 2007-06-11 | Silica gel mold material for casting metal ornament and its application |
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| JPH07171655A (en) * | 1993-12-17 | 1995-07-11 | Yukinori Kamitaka | Method for modifying resin for reconditioning casting sand in mold with water soluble resol type phenol resin as binder |
| CN1586918A (en) * | 2004-08-02 | 2005-03-02 | 李翠华 | Process for producing ornaments or artificial white marbe relief screen |
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