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WO2017064730A1 - Composition de mélange maître contenant une charge prétraitée, processus par étapes pour sa fabrication, et utilisations associées - Google Patents

Composition de mélange maître contenant une charge prétraitée, processus par étapes pour sa fabrication, et utilisations associées Download PDF

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Publication number
WO2017064730A1
WO2017064730A1 PCT/IN2016/000250 IN2016000250W WO2017064730A1 WO 2017064730 A1 WO2017064730 A1 WO 2017064730A1 IN 2016000250 W IN2016000250 W IN 2016000250W WO 2017064730 A1 WO2017064730 A1 WO 2017064730A1
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Prior art keywords
batch
master
composition
anyone
flowable
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Ceased
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WO2017064730A4 (fr
Inventor
Amit Kumar Paul
Sandip Mitra
Santu DEY
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Wacker Metroark Chemicals Pvt Ltd
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Wacker Metroark Chemicals Pvt Ltd
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Publication of WO2017064730A4 publication Critical patent/WO2017064730A4/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/02—Foam dispersion or prevention
    • B01D19/04—Foam dispersion or prevention by addition of chemical substances
    • B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
    • B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Definitions

  • TITLE A MASTERBATCH COMPOSITION COMPRISING A PRETREATED FILLER
  • the present invention provides for a storage stable and flowable master-batch composition and a step-wise process of making the master-batch composition that comprising the step of, admixing one or more ingredient selected from a part of a first reinforcing filler, a part of a non- reactive oil, and mixtures thereof, to obtain a mixed product. Then admixing step-wise one or more ingredient selected from a part of a pretreatment agent and a part of a first protic substance to the mixed product to form a partially reacted product. Then continuing admixing further parts of one or more ingredients until the ingredients are used-up to form a reacted product, andremoving volatiles from the reacted product to obtain the master-batch.
  • This master-batch is used as a base material for various applications, including but not limited toRTV-2 composition where in the master-batch a silicone base is addedto form the silicone compound which is the first component of a two-component room temperature curable silicone compositions.
  • the master-batch is further emulsified to obtain an emulsion composition that is used as a antifoam application and is also suitable for varied applications including a room temperature curable crosslinkable RTV-2 silicone composition.
  • RTV silicone rubber reproduces fine details and is helpful to make moulds for a variety of industrial and art related applications including prototypes, sculpture, architectural elements and furniture.
  • a filler/oil master- batch by (i) adding an unreactive silicone oil and untreated, aggregated filler particles to a mixer; (ii)
  • liquid silicone rubber base polymer compositions having improved color are prepared by reaction of fumed silica reinforcing filler with a silazane, and without drying the silazane-treated filler, an aliphatically unsaturated silicone is added, heated to above 80° C, and then further aliphatically unsaturated silicone is added.
  • the compositions have improved whiteness and color reproducibility.
  • hexamethyldisilazane is used in forming the masterbatch by loading the total . silazane all at one time of the reaction. But, as it is known that hexamethyldisilazane is a- highly flammable material having a flash point of 1 1 °C, the prior art process as described is highly dangerous and unsafe process.
  • the filler when the filler is treated in one step the hydroxyl group of the filler do not react properly and if filler is not treated properly the filler become thixotropic due to reaction of reactive polymer with the hydroxyl group of the silica.
  • a storage stable and flowable master-batch composition comprising:
  • a pretreated reinforcing filler having blocked surface hydroxyl groups with surface hydroxyl content less than 1000 parts per million of the composition.
  • the surface hydroxyl content is less than 500 parts per million. In one of the other preferred embodiments, the surface hydroxyl is completely blocked or reacted.
  • said storage stable and flowable master-batch composition comprises a diluent. More preferably said storage stable and flowable master-batch composition comprises a reactive organopolysiloxane base.
  • said storage stable and flowable master-batch composition comprises an extender filler.
  • the reactive organopolysiloxane comprising atleast a functional group selected from hydroxyl, alkoxy, vinyl and mixtures thereof.
  • the reinforcing filler is selected from pyrogenic silica, precipitated silica, silicon-aluminum mixed oxides, pyrogenic titanium dioxide or its mixtures thereof.
  • an emulsion composition comprising said storage stable and flowable master-batch composition.
  • a process of preparing a storage stable and flowable master-batch composition comprising step-wise manufacture of pretreated reinforcing filler including:
  • removing volatiles further comprises the steps of:
  • said process further comprises the step of adding a reactive organopolysiloxane base to the master-batch or the modified master-batch to form a liquid silicone rubber base polymer composition.
  • said process further comprises the step of adding an extender filler.
  • said reactive organopolysiloxane comprises atleast a functional group selected from hydroxyl, alkoxy, vinyl and mixtures thereof.
  • said reinforcing filler is selected from pyrogenic silica, precipitated silica, silicon-aluminum mixed oxides, pyrogenic titanium dioxide or its mixtures thereof.
  • said pretreatment agent is selected from an organosilane, an organosilazanes, an organosiloxanes or its mixtures thereof.
  • said process further comprises the step of adding a hardner composition post addition of reactive organopolysiloxane base to the master-batch or the modified master-batch to form crosslinkable RTV-2 silicone composition.
  • crosslinkable RTV-2 silicone composition comprising:
  • said crosslinkable RTV-2 silicone comprises liquid silicone rubber base polymer and . a hardner composition. More preferably said crosslinkable RTV-2 silicone composition is obtained by said process of preparing the masterbatch composition followed by adding a hardner composition post addition of reactive organopolysiloxane base to the master-batch or the modified master-batch to form crosslinkable RTV-2 silicone composition.
  • the hardener composition comprising atleast one crosslinking agent and atleast one catalyst.
  • crosslinked RTV-2 silicone comprises
  • cross linked liquid silicone rubber base polymer with hardener composition including
  • an emulsion composition comprising said master batch or modified master batch.
  • the present invention provides for a storage stable and flowable master-batch composition and a step-wise process of making the master-batch composition that comprising the step of, admixing one or more ingredient selected from a part of a first reinforcing filler, a part of a non-reactive oil, and mixtures thereof, to obtain a mixed product. Then admixing step-wise one or more ingredient selected from a part of a pretreatment agent and a part of a first protic substance to the mixed product to form a partially reacted product. Then continuing admixing further parts of one or more ingredients until the ingredients are used-up to form a reacted product, andremoving volatiles from the reacted product to obtain the master-batch.
  • This master-batch is used as a base material for various applications, including but not limited toRTV-2 composition where in the master-batch a silicone base is added to form the silicone compound which is the first component of a two-componentroom temperature curablesilicone compositions.
  • the master-batch is further emulsified to obtain an emulsion composition that is used as an antifoam application.
  • the filler react with the pretreatment agent (e.g. silazane) for improving reinforcing behavior of filler in rubber compound and carry out treatment with a lower concentration of silazane and thus reduce the chances of silazane flammability.
  • the pretreatment agent e.g. silazane
  • the present invention thus provides for a master-batch composition and a step-wise process of making the master-batch composition comprising a step-wise manufacturing of a pretreated reinforcing filler that comprising the step of:
  • step-wise process wherein removing volatiles further comprising the step of.heating the master-batch at a temperature between 40°C and 150°C to remove volatiles selected from ammonia, the protic substance and mixtures thereof.
  • the process further comprising the step ofoptionally diluting the master-batch with a diluent to obtain a modified master-batch.
  • the step of adding a reactive organopolysiloxane base to the master-batch or the modified master-batch to form the liquid silicone rubber base polymer composition is a reactive organopolysiloxane base to the master-batch or the modified master-batch to form the liquid silicone rubber base polymer composition.
  • the step-wise process further comprising the step of adding an extender filler.
  • the reactive organopolysiloxane comprising atleast a functional group selected from hydroxyl, alkoxy, vinyl and mixtures thereof.
  • the reinforcing filler is selected from pyrogenic silica, precipitated silica, silicon-aluminum mixed oxides, pyrogenic titanium dioxide or its mixtures thereof.
  • the pretreatment agent is selected from an organosilane, an organosilazanes.an organosiloxanes or its mixtures thereof.
  • a crosslinkabie RTV-2 silicone composition comprising a silicone rubber base polymer obtained by the process.
  • a crosslinkabie RTV-2 silicone composition further comprising a hardener composition.
  • a crosslinkabie RTV-2 silicone composition wherein the hardener composition comprising atleast one crosslinking agent and atleast one catalyst.
  • the pretreated reinforcing filler having blocked surface hydroxyl groups with surface hydroxyl content less than 1000 parts per million of the composition. In one of the preferred embodiments, the surface hydroxyl content less than 500 parts per million. In one of the other preferred embodiments, the surface hydroxyl is completely blocked or reacted.
  • Examples of the reinforcing filler having a specific surface area (BET) of at least 40 m 2 /g are pyrogenic silica, precipitated silica, silicon-aluminum mixed oxides and pyrogenic titanium dioxide. Preference is given to pyrogenic and precipitated silicas having a specific surface area (BET) of 50-400 m 2 /g, particularly preferably 90-300 m 2 /g.
  • the filler mentioned can have been pretreated, for example with organosilanes, organosilazanes or organosiloxanes
  • the fumed silica useful in the invention include fumed silicas having a specific surface area, measured by the BET method, of at least 50 m 2 /g, and more preferably 100 m 2 /g to 300 m 2 /g.
  • the compositions may also contain fillers, e.g. basic fillers such as ZnC0 3 , ZnO, CaC0 3 , CaO, MgC0 3 and MgO, which also act as curing accelerators, and extender fillers, such as diatomaceous earth, quartz, glass fibers, silica aerogels and fume silica, pigments flavorings and essential oils.
  • such fumed silicas are commercially available. Preference is given to pyrogenic and precipitated silicas having a specific surface area (BET) of 50-400 m 2 /g, particularly preferably 90-300 m 2 /g. Also useful, but less preferred, are partially hydrophobicizedsilicas which have been hydrophobicized only partially and then dried. Such silica still contain a significant amount of unreacted silanol groups, e.g. more than 10% (mol %) of the original surface silanol group content as determined by the 29 Si NMR, more preferably more than 20%, yet more preferably more than 30%, and may be in one embodiment, more than 40%, 50%, 60%, 70%, 80%, and 90%.
  • BET specific surface area
  • the pretreatment agent is selected from an organosilane, an organosilazanes.an organosiloxanes or its mixtures thereof.
  • the pretreatment agent e.g. silazane
  • used in the admixing step may be any silazane useful for making the silica compatible with the non-reactive oil by reacting with the active group of silica, preferably a disilazane.
  • the most preferred disilazanes are hexamethyldisilazane (“HMN”) and divinyltetramethyldisilazane (“VMN"). Both of these are commercially available products.
  • disilazanes substituted with other substituents preferably C2-18 alkyl groups, most preferably C2-6 alkyl groups, i.e. ethyl groups; aryl groups such as phenyl and napthyl, arylalkyl groups such as benzyl and phenylethyl; alkaryl groups such as tolyl and xylyl; cycloalkyl groups, and the like.
  • substituents preferably C2-18 alkyl groups, most preferably C2-6 alkyl groups, i.e. ethyl groups; aryl groups such as phenyl and napthyl, arylalkyl groups such as benzyl and phenylethyl; alkaryl groups such as tolyl and xylyl; cycloalkyl groups, and the like.
  • substituents preferably C2-18 alkyl groups, most preferably C2-6 alkyl groups, i.e. ethyl groups; ary
  • the disilazane may also include Si-bonded unsaturated groups such as vinyl, alkyl, propenyl, isopropenyl, 5-hexenyl (meth)acryloxy, and the like. Since effective removal of active groups of silica does not require unusual or exotic substituents, substituents selected from C2-6 alkenyl and C1 -6 alkyl are preferred, with methyl, ethyl, vinyl and allyl groups being more preferred, and with methyl and vinyl being most preferred.
  • polysilazanes such as hexamethylcyclotrisilazane and octamethylcyclotetrasilazane are also useful, as well as other cyclic silazanes which act by a ring opening reaction with silanol groups.
  • the disilazanes and polysilazanes described above include all organic disilazanes useful for silica, and are referred to hereafter as “organic disilazanes,” or more simply, “silazanes”.
  • the silazanes are used in an amount effective to achieve the desired blocking of the reactive groups (e.g. hydroxyl) of the silica.
  • the effective amount of silazane will be proportional to the surface siianol content, e.g. in nmol/g or pmol/g, with silicashaving more active group requiring more silazane and silicashaving less active group requiring less silazane.
  • the silazane is generally present in an amount, based on silica, of 1 to 40% by weight, preferably 5 to 40% by weight, more preferably 10 to 40% by weight, and most preferably 20% to about 30% by weight.
  • the amount is preferably such that the partially reacted silica contains from 2 to 20 weight percent, preferably 5 to 10 weight percent of dimethylsiloxy units or 3 to 20 weight percent, preferably 6 to 12 weight percent of trimethylsiloxy units, and when a mixture of dimethylsiloxy and trimethylsiloxy groups, or other silazane-derived groups are present, these amounts are adjusted accordingly.
  • the weight percentages are based on the total weight of the silica.
  • Water or another protic substance, preferably water, must be present during the admixing step of the process.
  • Water may be present in adsorbed or absorbed form on the silica, or may be added separately.
  • Deionized water or reverse osmosis-produced water is preferably used.
  • Water should preferably be present in sufficient amount to react with substantially all of the silazane added. This amount is thus at least partially dependent upon the amount of silazane added, which is also dependent upon the surface siianol content of the silica. Suitable amounts of water can easily be determined, for example by monitoring unreacted silazane, by monitoring the amount of ammonia liberated.
  • a protic substance preferably water
  • a protic substance preferably water
  • a temperature of from -20° C. to 100° C preferably 0° C. to 80° C, more preferably 10° C. to 60° C, and most preferably at a temperature established by mixing silica, silazane and water in a stirred reactor at room temperature, without the use of external heat or cooling, which is preferred.
  • an exotherm will be produced as the silazane reacts. This exotherm may cause the temperature to rise, for example, to a temperature of from 40° C. to 70° C, preferably 50-60° C.
  • the final temperature reached is not critical so long as coloration is avoided, but should be sufficient to react a substantial portion of the silazane at this stage, to form a master-batch.
  • Ammonia will be generated at this stage, and is preferably removed according to best practice.
  • One of the applications of the master-batch prepared is a cross-linkable RTV-2 composition.
  • the next stage is mixing of the silicone base polymer to the master-batch and few of the ingredients like Ti0 2 and moisture adjuster to form the first component of the two-component room temperature curable silicone composition.
  • a silicone base polymer is at least one silicone base polymer selected from a silicone OH polymer (hydroxyl-terminated dimethylpolysiloxane fluid (viscosity of 12000 cps at 25°C available from Wacker, (OH 12 K silicone polymer)) or a silicone polymer having at least two aliphatically unsaturated groups, these silicones being organopolysiloxanes containing at least three silicon atoms.
  • the average content of aliphatically unsaturated groups may be less than two. This may be achieved, for example, by incorporating silicone polymers bearing a single unsaturated group in conjunction with silicone polymers containing two or more unsaturated groups.
  • the second component is usually a hardener composition, where the hardener composition comprising atleast one crosslinking agent . and atleast one catalyst.
  • the catalyst that catalysesthe condensation or addition reaction of the silicone base polymer (present in the first component) to impart desired mechanical properties of the room temperature vulcanized rubber and the flow property and the cure properties of the mix of the first and second component of the two component room temperature curable silicone composition.
  • the mixture After mixing the first and the second component the mixture is usually poured in a die and left over time to get cured to form the room temperature vulcanized rubber.
  • the pouring of the mixed fluid is governed by the mixed viscosity in cps at 25°C.
  • the 100 parts of firstcomponent of the two-component liquid silicone rubber base polymer is mixed in an amount of 1 to 10 parts preferably 5 parts of a Tin based catalyst which is the second component to get the room temperature vulcanized rubber.
  • the master-batch composition is used as an anti-foam composition.
  • the master-batch or the diluted master-batch is optionally diluted with a diluent preferably the non- reactive oil and emulsified with one or more non-ionic emulsifier and its mixtures to foam an emulsified composition.
  • a diluent preferably the non- reactive oil and emulsified with one or more non-ionic emulsifier and its mixtures to foam an emulsified composition.
  • Such emulsion of the present invention is having superior antifoam action.
  • non-reactive oil used is WACKER® AK 350 SILICONE FLUiD (AK 350) is a linear, non-reactive polydimethylsiloxane with a viscosity of approx. 350 mm 2 /s.
  • Silazane used is a WACKER® SILAZAN HMN (Silazen HMN) is a colorless liquid with strong odour.
  • VN 3 GR VN3 filler
  • VN3 filler VN3 filler
  • Water used is a reverse osmosis treated demineralized water.
  • the In situ filler treatment is done in sigma mixture.
  • Table 1 Inventive step-wise process followed for Recipe of table 1 :
  • Stage 1 In stage 1 the inventive method step is followed in Sigma mixture to form the Master- batch
  • the master-batch as formed in stage 1 it is found that by Si NMR the hydroxyl content of the master-batch as formed in stage 1 is less than 500 parts per million, which suggest that the surface hydroxyl group of the reinforcing filler is reacted/ blocked.
  • Stage 2 (a): In stage 2 the Master-batch of stage 1 is further with a silicone base polymer to form the first component of the condensation system in a Dispenser
  • Stage 1 (comparative): (In stage 1 the comparativemethod of one step is followed in Sigma mixture to form the Master batch)
  • Stage 2 (comparative) condensation To the base formed in the comparative product of Stage 1 of Table 2 to form the silicone compound which is the comparative first component SI RM Qnty (gms) %
  • Stage 2 (inventive) addition: In stage 2 the Master-batch of stage 1 of Table 1 , is further with a silicone base polymer (vinyl polymer) to form the first component of the addition system in a Dispenser SL no RM Quantity (Kg) %
  • the material that is formed in Stage 2, Table 2 of the comparative example, on storage becomes thixotropic or the flow property degrades on storage.
  • the first component produced by the inventive process obtained at step 2 of the table 1 and stage 2 (inventive) addition systems remains flowable and do not looses flowability on storage.
  • emulsion is formedhaving visual appearance of white liquid, Nonvolatile substance (at 105 °Cfor 3 hrs.) is from 55 - 65% having a pH at 25°C 7 - 9.
  • the emulsion is Water miscibility Dispersible and emulsifier is a non-ionic type.
  • Preparation Prepare 1 lit of surfactant solution.Add 0.01 % and 0.02 volume% amount of antifoam respectively.
  • test solution is poured into a jacketed glass cylinder. Temperature is set to 60°C.
  • Air flow is passed through a sintered glass bubbler (6lit/min).Foam is generated by the air flow. Time to reach the 2 lit mark is noted. More the time required to reach 2 lit mark is better efficiency of the antifoam.

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  • Health & Medical Sciences (AREA)
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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
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Abstract

La présente invention concerne une composition de mélange maître et un processus par étapes pour sa fabrication, comprenant les étapes consistant à mélanger un ou plusieurs ingrédients sélectionnés parmi une partie d'une première charge de renforcement, une partie d'une huile non réactive, et des mélanges de celles-ci, pour obtenir un produit mélangé, à ajouter progressivement un ou plusieurs ingrédients sélectionnés parmi une partie d'un agent de prétraitement et une partie d'une première substance protique pour le produit mélangé pour former un produit de réaction partielle. La charge réagit avec l'agent de prétraitement (par exemple silazane) pour améliorer le comportement de renforcement de la charge et effectue un traitement avec une concentration plus faible d'agent de prétraitement (par exemple silazane), ce qui réduit le risque d'inflammabilité du silazane. Le processus comprend également l'étape consistant à continuer à mélanger d'autres parties d'un ou plusieurs ingrédients jusqu'à ce que les ingrédients soient entièrement utilisés pour former un produit de réaction, et à éliminer les produits volatils du produit de réaction pour obtenir un mélange maître, à chauffer le mélange maître à une température comprise entre 40 °C et 150 °C pour éliminer l'ammoniac et la substance protique, et à diluer éventuellement le mélange maître avec l'huile non réactive. La composition de mélange maître est utilisée dans diverses applications, par exemple comme matériau de base pour former le composé de silicone, qui est le premier composant de compositions de silicone durcissable à température ambiante à deux composants. L'émulsion préparée du mélange maître est utilisée comme composition de démoussage.
PCT/IN2016/000250 2015-10-16 2016-10-17 Composition de mélange maître contenant une charge prétraitée, processus par étapes pour sa fabrication, et utilisations associées Ceased WO2017064730A1 (fr)

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CN109912981A (zh) * 2019-02-25 2019-06-21 合肥创新轻质材料有限公司 一种硅酮母料及其制备方法

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