WO2022064460A1 - Copolymère de polysiloxane et composition de revêtement préparée à partir de celui-ci - Google Patents

Copolymère de polysiloxane et composition de revêtement préparée à partir de celui-ci Download PDF

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Publication number
WO2022064460A1
WO2022064460A1 PCT/IB2021/058796 IB2021058796W WO2022064460A1 WO 2022064460 A1 WO2022064460 A1 WO 2022064460A1 IB 2021058796 W IB2021058796 W IB 2021058796W WO 2022064460 A1 WO2022064460 A1 WO 2022064460A1
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Prior art keywords
coating composition
range
copolymer
polysiloxane copolymer
predetermined
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PCT/IB2021/058796
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English (en)
Inventor
Rama Shanker MISHRA
Sundanthiramoorthy SUBRAMANIAN
Archana KAMBLE
Subarna Shyamroy
Shekhar TAMBE
Satchidanand GHURYE
Shrikant NAIK
Rajeev Kumar GOEL
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Asian Paints Limited
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Publication of WO2022064460A1 publication Critical patent/WO2022064460A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
    • C08G77/44—Block-or graft-polymers containing polysiloxane sequences containing only polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions 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; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
    • C09D183/10—Block or graft copolymers containing polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/80—Siloxanes having aromatic substituents, e.g. phenyl side groups

Definitions

  • the present disclosure relates to a polysiloxane copolymer and a coating composition prepared therefrom. Particularly, the present disclosure relates to a polysiloxane copolymer and a process for its preparation. Further, the present disclosure relates to a coating composition comprising the polysiloxane copolymer and a process for its preparation.
  • Cyclic stress refers to the repetitive occurrence and redistribution of forces acting on a material. Periodic or regular cyclic stress conditions lead to increased wear and tear of the material, thus increasing the rate of material degradation and failure.
  • Thinning refers to a step in the preparation of a coating composition, wherein a suitable solvent is added to the coating composition for reducing thickness to obtain the coating composition with desirable consistency.
  • Polysiloxane polymers are mainly used in the protective coatings, adhesives, sealants, stationary, craft and other various applications. Generally, polysiloxane polymers are known to impart flexibility, impact strength, weather and high heat resistance in end use applications. Polysiloxane polymers can also be combined with resins of other functionality to tune the properties of the final product such as when the polysiloxane polymer is combined with an epoxy resin, which is then cured with amine based curing agent to provide polysiloxane-epoxy resin based product with improved properties such as impact resistance, flexibility, and corrosion resistance. However, these polysiloxane-epoxy resin based products generally sustain maximum up to 300 °C temperature.
  • the use of the high molecular weight polysiloxane polymer is preferred, however the use of the high molecular weight polysiloxane polymer leads to the loss of flexibility of the final product after exposure to the high temperature environment and hence results in delamination from the substrate at higher temperatures. Further, if the lower molecular weight polysiloxane polymers are used to maintain the flexibility of the final product at a high temperature, longer curing time/ heat based curing/ crosslinking agent is required to cure the product to get the desired crosslinking density. The longer curing time and use of the heat or crosslinking agents are detrimental for flexibility of the final product at higher temperatures.
  • CUI Corrosion under Insulation
  • the conventional CUI coatings that are available in market suffer from limitations such as poor performance at higher temperatures (> 450°C) and cyclic stress. Moreover, most of the conventional CUI coatings are known for their heavy settling property due to which the applicator faces difficulties while applying the coating.
  • An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
  • Another object of the present disclosure is to provide a polysiloxane copolymer.
  • Yet another object of the present disclosure is to provide a process for the preparation of a polysiloxane copolymer.
  • Still another object of the present disclosure is to provide a polysiloxane copolymer that is cured at an ambient temperature.
  • Yet another object of the present disclosure is to provide a coating composition comprising the polysiloxane copolymer that maintains flexibility at a temperature greater than 500 °C.
  • Still another object of the present disclosure is to provide a coating composition that can withstand cycling heat resistance, high stress level and weathering.
  • Yet another object of the present disclosure is to provide a coating composition that has a comparatively better adhesion on mild steel and stainless steel surfaces and has better abrasion resistance and high thermal shock resistance.
  • Still another object of the present disclosure is to provide a coating composition that controls the corrosion under insulation (CUI).
  • Yet another object of the present disclosure is to provide a process for the preparation of a coating composition comprising the polysiloxane copolymer.
  • the present disclosure relates to a polysiloxane copolymer being a product of part A comprising an alkyl and/or aryl substituted silanol-functional silicone prepolymer and part B comprising an alkyl and/or aryl substituted alkoxy- functional silicone prepolymer, wherein a ratio of the part A to the part B is in the range of 1:0.5 to 1:2.
  • the present disclosure further relates to a process for the preparation of the polysiloxane copolymer.
  • the process comprises the step of mixing part A comprising an alkyl and/or aryl substituted silanol-functional silicone prepolymer and part B comprising an alkyl and/or aryl substituted alkoxy- functional silicone prepolymer in a fluid medium in the presence of an organometallic catalyst, optionally using a flexibilizer at a predetermined temperature for a predetermined time period to obtain the polysiloxane copolymer, wherein a ratio of the part A to the part B is in the range of 1:0.5 to 1:2.
  • the present disclosure relates to a coating composition
  • a coating composition comprising a polysiloxane copolymer; at least one pigment; at least one extender; at least one modifying agent; at least one additive; hollow glass microspheres; and at least one fluid medium.
  • the present disclosure relates to a process for preparing the coating composition.
  • the process comprises a step of mixing predetermined amounts of a polysiloxane copolymer, at least one modifying agent and at least one additive in a first fluid medium under stirring at a first predetermined speed for a first predetermined time period at a first predetermined temperature to obtain a mill base.
  • Predetermined amounts of at least one pigment and at least one extender are added to the mill base followed by grinding at a second predetermined speed for a second predetermined time period at a second predetermined temperature to obtain a slurry.
  • a predetermined amount of glass microspheres is added to the slurry followed by thinning by using at least one second fluid medium at a third predetermined speed for a third predetermined time period at a third predetermined temperature to obtain a homogenized slurry.
  • the homogenized slurry is cooled to a temperature in the range of 20 °C to 28 °C followed by filtration to obtain the coating composition.
  • Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
  • Corrosion under Insulation is one of the major problems for oil and gas pipelines in refining, power and chemical processing industries, as well as in the marine environments.
  • the conventional CUI coatings that are available in the market suffer from limitations such as poor performance at higher temperatures (> 450°C) and cyclic stress.
  • most of the conventional CUI coatings are known for their heavy settling property due to which the applicator faces difficulties while applying the coating.
  • Polysiloxane polymeric material finds variety of applications in the coating, adhesive, sealant, stationary, craft industries because of the well-known properties of the product made therefrom.
  • the polysiloxane polymer when combined with the other resins having functionality such as epoxy resins or acrylic resins, the so obtained product has the improved properties (when compared to the product made from either of the materials solely).
  • the product prepared from the modified and unmodified polysiloxane based polymers possess the drawback of loss of flexibility after exposure of the same to high temperatures which results into delamination from the substrate.
  • the present disclosure provides a polysiloxane copolymer and a process for its preparation. Further, the present disclosure provides a coating composition comprising the polysiloxane copolymer and a process for its preparation.
  • the present disclosure provides a polysiloxane copolymer being a reaction product of part A comprising an alkyl and/or aryl substituted silanol-functional silicone prepolymer and part B comprising an alkyl and/or aryl substituted alkoxy- functional silicone prepolymer, wherein a ratio of the part A to the part B is in the range of 1:0.5 to 1:2.
  • the polysiloxane copolymer is represented by formula I:
  • R 1 , R2 , R 3 and R 4 are independently selected from methyl, ethyl, propyl, butyl, pentyl, hexyl and aryl; and x and y are integers independently selected from 1 to 6.
  • the part A comprising an alkyl and/or aryl substituted silanol-functional silicone prepolymer is represented by formula la: wherein,
  • R 1 and R 4 are independently selected from methyl, ethyl, propyl, butyl, pentyl, hexyl and aryl; and n is an integers selected from 1 to 6.
  • the part B comprising an alkyl and/or aryl substituted alkoxy- functional silicone prepolymer is represented by formula lb:
  • R 2 and R 3 are independently selected from methyl, ethyl, propyl, butyl, pentyl, hexyl and aryl; and n is an integers selected from 1 to 6.
  • the polysiloxane copolymer of the present disclosure is formulated such that the rates of internal polymerization reaction can be controlled.
  • the polymerization reaction can take place over a broad temperature range, including ambient and high temperatures.
  • the alkyl group in the part A and the part B is independently selected from methyl, ethyl, propyl, butyl, pentyl and hexyl.
  • the aryl group in the part A and the part B is independently selected from phenyl and benzyl.
  • the Part A and Part B independently comprises two or more reactive functionalities per repeat unit comprising two Si atom (-[-Si-O-Si]-O-).
  • the reactive functionality is silanol (-Si-OH).
  • the reactive functionality is alkoxy silane (-Si-O-C).
  • the part A and the Part B independently comprises at least one aryl substituent per repeating unit comprising two Si atom (-[-Si-O- Si]-O-).
  • the part A is optionally modified by incorporating polyurethane or polyurea based flexibilizer.
  • the part B is optionally modified with amine/epoxy/NCO/SH functional silane or their adducts with epoxy.
  • the backbone of the polysiloxane copolymer is kinetically optimized in such a way that a pre-determined molecular weight of the polysiloxane copolymer is obtained.
  • the pre-determined molecular weight of the polysiloxane copolymer is in range of 2000 g/mol to 15000 g/mol.
  • the polysiloxane copolymer is monomodal or bimodal depending on the specific application.
  • the polysiloxane copolymer of the present disclosure is one component, ambient or low temperature moisture curable, and storage stable.
  • the polysiloxane copolymer of the present disclosure can be used in industries such as coating, adhesive, sealant, construction chemicals, admixture, stationary adhesives, and craft materials.
  • the polysiloxane copolymer is used for preparing a coating composition that maintains flexibility at a temperature in the range of 500 °C to 1000 °C.
  • the present disclosure provides a process for preparation of the polysiloxane copolymer.
  • the process comprises the step of mixing part A comprising an alkyl and/or aryl substituted silanol-functional silicone prepolymer and part B comprising an alkyl and/or aryl substituted alkoxy-functional silicone prepolymer in a fluid medium in the presence of an organometallic catalyst optionally by using a flexibilizer at a predetermined temperature for a predetermined time period to obtain the polysiloxane copolymer, wherein a ratio of the part A to the part B is in the range of 1:0.5 to 1:2.
  • the organometallic catalyst is selected from tetra-isopropyl titanate (Tyzor TPT), tetra-n-butyl titanate (Tyzor TNBT), Tetrakis(2-ethylhexyl) orthotitanate (Tyzor TOT), titanium tetrapropanolate (Tyzor NPT), a mixture of tetra-isopropyl and tetra-n-butyl titanate (Tyzor TPT-20 B), titanium acetylacetonates (Tyzor AA, Tyzor AA-65, Tyzor AA-75, Tyzor AA-105, Tyzor GBA, Tyzor GBO), titanium ethylacetoacetate (Tyzor DC), triethanolamine titanium complex (Tyzor TE), organotin carboxylate (TIB KAT 218) and organotin carboxylate (DABCO T12).
  • TPT tetra-iso
  • the fluid medium is nonalcoholic or non-glycolic.
  • the fluid medium is at least one selected from the group consisting of ortho-xylene, mineral turpentine oil, solvent C-IX (a mixture of aromatic hydrocarbon solvents), n- butanol, Butyl acetate, methyl isobutyl ketone (MIBK) and methyl ethyl ketone (MEK).
  • the fluid medium is orthoxylene.
  • the flexibilizer is at least one selected from the group consisting of Lapox Bll (unmodified epoxy resin based on bisphenol-A), Lapox P101 (75% solution of solid epoxy resin (type-1) in xylene), DER-664U (epoxy resin of epichlorohydrin and bisphenol A), Dynasylan AMEO (3- aminopropyltriethoxy silane), adduct of Lapox Bl l and Dynasylan AMEO, adduct of Lapox P101 and Dynasylan AMEO, adduct of DER-664U and Dynasylan AMEO, Silquest A-link- 35 (isocyanate functional trimethoxy silane), Coatosil T-Cure (mercapto silane), adduct of Silquest A-link-35 and Coatosil T-Cure, adduct of Dynasylan AMEO and Coaosili T-Cure, adduct of Lapox Bl
  • Lapox Bl unmodified epoxy resin
  • the predetermined time period is in the range of 3 hours to 9 hours. In an exemplary embodiment, the pre-determined time period is 6 hours.
  • the present disclosure provides a coating composition
  • a coating composition comprising a polysiloxane copolymer; at least one pigment; at least one extender; at least one modifying agent; at least one additive; hollow glass microspheres; and at least one fluid medium.
  • the coating composition comprises 10 to 20 wt% of the polysiloxane copolymer with respect to the total amount of the coating composition; 40 to 50 wt% of at least one pigment with respect to the total amount of the coating composition; 20 to 40 wt% of at least one extender with respect to the total amount of the coating composition; 1 to 5 wt% of at least one modifying agent with respect to the total amount of the coating composition; 0.5 to 2 wt% of at least one additive with respect to the total amount of the coating composition; 0.1 to 1 wt% of the hollow glass microspheres with respect to the total amount of the coating composition; and 5 to 15 wt% of at least one fluid medium with respect to the total amount of the coating composition.
  • the polysiloxane copolymer is represented by formula I: Formula I wherein,
  • R , R , R and R are independently selected from methyl, ethyl, propyl, butyl, pentyl, hexyl and aryl; and x and y are integers independently selected from 1 to 6.
  • the polysiloxane copolymer used in the coating composition of the present disclosure provides cycling heat resistant and stress resistant properties to the coating and helps to withstand weathering of the coating.
  • the pigment is at least one selected from carbon black pigment, zinc phosphate, zinc oxide and micaceous iron oxide.
  • a weight ratio of the pigment to the polysiloxane copolymer is in range of 1:0.15 to 1:0.4. This ratio is very crucial to achieve the desired flexibility and the heat resistance properties in the coating composition.
  • the micaceous iron oxide has a lamellar shape.
  • the micaceous iron oxide with lamellar shape acts as an inert barrier to the vertical penetration of corrosive elements.
  • the extender is at least one selected from silica, mica and steatite.
  • the extender is a combination of silica and steatite.
  • the extender is a combination of mica and steatite. The extender provides reinforcement to the coatings when applied on the substrate and thus, improves the mechanical properties of the coatings on the substrate.
  • the modifying agent is at least one selected from an organic derivative of bentonite clay, modified hectorite (Bentone Jelly), molecular sieves, micronized amide wax, modified silica, trimethoxysilane, graphite, and silicon based defoaming agent.
  • the organic derivative of bentonite clay acts as an anti-settling agent and prevents the tendency of heavy settling in the coating composition even after 1 year of shelf life.
  • the molecular sieves (Zeolith 141 4A powder) acts as moisture adsorbent with excellent kinetic gas adsorption present in the paint compaction.
  • the micronized amide wax, commercially available as Crayvallac ultra is commonly used as rheology modifier that offers very good recoatability for ambient curing solvent-based coatings.
  • Graphite powder provides functionality as thermal conductor and corrosion shield. Trimethoxysilane (Silane A- 187) acts as an adhesion promoter.
  • the silicon based defoaming agent is polymethylalkylsiloxane (commercially available as BYK 085).
  • the silicon based defoaming agent is used to prevent foam and bubble formation during the processing and application of the coating composition.
  • the modified silica is a fumed silica aftertreated with DDS (Dimethyldichlorosilane), commercially available as Aerosil 972.
  • DDS Dimethyldichlorosilane
  • Aerosil 972 The modified silica is generally used in coatings as anti-settling agent, for pigment stabilization and improvement of corrosion protection.
  • the additive is at least one selected from a high molecular weight block copolymer (commercially available as Disperbyk 163) and a structured acrylate copolymer (commercially available as Disperbyk 2000) as dispersing agents; and soyalecithin as an emulsifier.
  • the fluid medium is at least one selected from mixed xylene, n-butanol, isobutanol, solvent C-IX (a mixture of aromatic hydrocarbon solvents), and mineral turpentine oil.
  • the fluid medium is a combination of mixed xylene and isobutanol.
  • the fluid medium is a combination of mixed xylene, isobutanol and solvent C-IX (a mixture of aromatic hydrocarbon solvents).
  • the hollow glass microspheres used in the coating composition of the present disclosure enhance filler loading, lower the viscosity/improve the flow ability and reduce shrinkage of the coating composition. Further, the hollow glass microspheres enhance higher pigment loading and give high heat resistance along with extreme cryogenic resistance properties to the coating composition.
  • the present disclosure provides a process for preparing the coating composition.
  • the process comprises a step of mixing predetermined amounts of a polysiloxane copolymer, at least one modifying agent and at least one additive in a first fluid medium under stirring at a first predetermined speed for a first predetermined time period at a first predetermined temperature to obtain a mill base.
  • the first predetermined speed is in the range of 200 rpm to 300 rpm.
  • the first predetermined time period is in the range of 10 minutes to 15 minutes.
  • the first predetermined temperature is in the range of 30 °C to 35 °C.
  • Predetermined amounts of at least one pigment and at least one extender are added to the mill base followed by grinding at a second predetermined speed for a second predetermined time period at a second predetermined temperature to obtain a slurry.
  • the second predetermined speed is in the range of 1200 rpm to 1500 rpm.
  • the second predetermined time period is in the range of 30 minutes to 45 minutes.
  • the second predetermined temperature is in the range of 40 °C to 60 °C.
  • a predetermined amount of glass microspheres is added to the slurry followed by thinning by using at least one second fluid medium at a third predetermined speed for a third predetermined time period at a third predetermined temperature to obtain a homogenized slurry.
  • the third predetermined speed is in the range of 200 rpm to 300 rpm.
  • the third predetermined time period is in the range of 10 minutes to 15 minutes.
  • the third predetermined temperature is in the range of 35 °C to 40 °C.
  • the homogenized slurry is cooled to a temperature in the range of 20 °C to 28 °C followed by filtration to obtain the coating composition.
  • the coating composition prepared by using the polysiloxane copolymer can maintain its flexibility at a temperature in the range of 500 °C to 1000 °C on suitable substrates, particularly upto 800 °C.
  • the coating composition prepared by using the polysiloxane copolymer is characterized by having the following properties:
  • Example- 1 48 g of an silanol-functional phenylpropyl polysiloxane prepolymer and 27g of an alkoxyfunctional phenyl polysiloxane prepolymer were mixed in 25ml of ortho-xylene (fluid medium) at 120 °C for 9 h to obtain the poly siloxane copolymer.
  • Tyzor TNBT organometallic catalyst
  • Table 1 Performance comparison of polysiloxane copolymers between examples 1-6 of the present disclosure and comparative examples
  • the polysiloxane copolymer of Examples 1-6 when studied for the time required for drying the film on mild 10 steel at ambient temperature, was found to be in the range of 4 to 6 hours, whereas, for the polysiloxane copolymer of Comparative Examples I-II, it was found to be non-drying and for Comparative Example III, it was 12 hours.
  • Predetermined amounts of the polysiloxane copolymer prepared in Example 2 of Experiment 1, at least one modifying agent and at least one additive were mixed in a first fluid medium under stirring at a first predetermined speed for a first predetermined time period at a first 5 predetermined temperature to obtain a mill base.
  • Predetermined amounts of at least one pigment and at least one extender were added to the mill base followed by grinding at a second predetermined speed for a second predetermined time period at a second predetermined temperature to obtain a slurry.
  • a predetermined amount of glass microspheres was added to the slurry followed by thinning by using at least one second fluid medium at a 10 third predetermined speed for a third predetermined time period at a third predetermined temperature to obtain a homogenized slurry.
  • the homogenized slurry was cooled to 25 °C followed by filtration to obtain the coating composition.
  • the coating composition of the examples 1-8 were prepared by following the process as 15 disclosed herein above, with variable ingredients with variable amounts.
  • Table 2a The ingredients with variable amounts used in the process for preparing the coating composition and the test results of the coating composition (Examples 1-8).
  • Table 2b The ingredients with variable amounts used in the process for preparing the coating composition and the test results of the coating composition (Examples 9-16).
  • the examples 1 to 16 were designed by varying the ingredient type and amount. The experiments are presented as a sequence to achieve desired physical- mechanical and heat resistance properties. The coating composition of example 16 shows the satisfactory performance as compared to the coating compositions of examples 1-15.
  • Table 3a indicates the mechanical properties such as impact test, abrasion resistance and adhesion strength of optimized formulation.
  • Table 3b shows the chemical resistance and corrosion resistance properties of coating in different corrosive environments.

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Abstract

La présente invention concerne un copolymère de polysiloxane et un procédé pour sa préparation. Le copolymère de polysiloxane de la présente invention peut être durci à une température ambiante et est maintenu à des températures élevées sans perte de souplesse. En outre, la présente invention concerne une composition de revêtement comprenant le copolymère de polysiloxane et un procédé de préparation de la composition de revêtement. La composition de revêtement de la présente invention peut être utilisée pour un revêtement à résistance thermique élevée et le revêtement anti-corrosion sous isolation (CUI).
PCT/IB2021/058796 2020-09-26 2021-09-27 Copolymère de polysiloxane et composition de revêtement préparée à partir de celui-ci WO2022064460A1 (fr)

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CN116144262A (zh) * 2023-03-27 2023-05-23 天津灯塔涂料工业发展有限公司 有机硅复配涂料及其制备方法
CN117659862A (zh) * 2023-12-18 2024-03-08 北京和尔泰新材料科技有限公司 一种耐高温防护涂料及其制备和使用方法

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Publication number Priority date Publication date Assignee Title
CN116144262A (zh) * 2023-03-27 2023-05-23 天津灯塔涂料工业发展有限公司 有机硅复配涂料及其制备方法
CN117659862A (zh) * 2023-12-18 2024-03-08 北京和尔泰新材料科技有限公司 一种耐高温防护涂料及其制备和使用方法

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