Classifications

• • 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
  • C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• • 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
  • C08K5/00—Use of organic ingredients
  • C08K5/54—Silicon-containing compounds
  • C08K5/544—Silicon-containing compounds containing nitrogen

Definitions

• This invention relates to a silicone composite.
• the composite in this invention can be used to adjust the pH value in water-based architectural coatings.
• pH regulators are commonly used additives in water-based architectural coatings.
• the alkali swelling emulsion thickener in the formulations is acidic. Only after alkaline pH regulator is added and polymer carboxylate is formed can it function as a thickener.
• slightly alkaline water-based coating will not get corrupted easily .
• slightly alkaline coating can decelerate the corruption of the iron tins .
• pH regulators in water-based coatings are as follows: potassium hydroxide (or sodium hydroxide) , ammonia, monoethanol amine, diethanolamine , triethanolamine ,
• the purpose of this invention is to obtain a pH regulator which is able to adjust pH value stably, safe and environment friendly, cheap and able to improve the scrubbing resistance of the water-based architectural coating.
• the composite obtained by combining alkylsilanol metal salt and functional silane can significantly increase the scrubbing resistance of the water-based architectural coating and meanwhile it has no VOC or smell, and is also cheap.
• the composite as defined in this invention is mainly used in water-based architectural coatings and it can be also used in water-based polymer emulsions, water-based inks, water-based adhesives and water-based wood coatings etc.
• R ⁇ i (OH) 2 OM in which R 1 is C1-C4 alkyl or alkene; M is alkali metal,
• the general chemical formula of the functional silane as defined is (R 2 0) a (R 3 ) b Si R 4 ; in which, R 2 , R 3 are C1-C6 alkyl, preferably C1-C2 alkyl, R 2 and R 3 can either be the same or different, a is 1 or 2 or 3, b is 0,1 or 2; R 4 is a functional group containing nitrogen, preferably functional groups containing primary amines and/or 1-3 secondary amines, preferably functional groups containing propyl, 1 primary amine and/or 1 secondary amine, preferably the ones with structural formula from -C 3 H e NHCONH 2 , -C 3 H 6 NH 2 , - C3H6 HC2H4NH2 .
• R 1 is C1-C4 alkyl, preferably methyl , ethyl and propyl, most preferably methyl or ethyl;
• M is sodium or potassium, preferably potassium .
• the functional silane is preferably silane with boiling point higher than 250 ° C, which is one of the following or a mixture of several from the following: N- ( - 2 -aminoethyl) (3-aminopropyl) trimethoxy silane,
• the alkylsilanol metal salt is 1-99%, based on total weight of the water-based pH regulator, preferably 15-60%; most preferably 15-35% (w/w) .
• the functional silane is 0.1-99%, based on total weight of the water-based pH regulator, preferably 1-20%; most preferably 1-5% (w/w) .
• the composite also contains 0.1-10% potassium hydroxide or sodium hydroxide.
• the silicone composite is 0.05-1
• the water-based architectural coatings include vinyl acetate-ethylene coating system, styrene acrylic coating system, pure acrylic coating system, silicone-acrylic coating system and vinyl acetate-acrylic coating system.
• the preparation process of the pH regulator as defined in this invention is relatively easy. Simply mix the alkylsilanol metal salt and the functional silane under room temperature, and add potassium hydroxide or sodium hydroxide or potassium hydroxide water solution or sodium hydroxide water solution as needed.
• Potassium methylsiliconate CH 3 Si (OH) 2 OK brand name SILRES ® BS16 , is a water solution that contains 54%(w/w) potassium
• N- ( -2-aminoethyl) (3 -aminopropyl) trimethoxy silane brand name GENIOSIL ® GF 91, from Wacker Chemie AG;
• the viscometer used in this invention is "KU-2 Viscometer” from BROOKFIELD, the unit of the values in all the tables is KU.
• the instrument for measuring pH value is the "lab pH meter” from METTLER TOLDO .
• the scrubbing resistance tester REF 903 from SHEEN is used in this invention and the protocol in ASTM D2486-2006 is followed to test the scrubbing resistance. Preparation of pH regulator comparison example
• AMP 95 from the DOW Chemical Company, is a water solution containing 95 % (w/w) 2 -amino-2 -methyl-1-propanol . It is the best pH regulator in the current commercial coating area and is set as pH regulator comparison example 3.
• alkylsilanol metal salt which can be made from water solutions of potassium methylsiliconate, sodium methylsiliconate, etc.
• functional silane which includes N- ( -2-aminoethyl) (3-aminopropyl) trimethoxy silane, N- ( -2 -aminoethyl ) (3 -aminopropyl ) methyl dimethoxy silane, (3-aminopropyl) trimethoxy silane,
• the pH regulator examples 1-13 and 17-23 prepared in this invention are colorless transparent solutions with stable characters and odorless .
• Potassium methyl silicate mentioned in Table 1, 2 and 3 is referred to pure material. But Potassium methyl silicate is added to pH regulator samples as its water solution during preparation, such as SILRES ® BS16. In Table 1, 2 and 3, KOH and NaOH are referred to pure material which can be also added in the form of KOH/NaOH water solution during preparation.
• a typical water-based architectural coating preparation method is as follows:
• Titanium dioxide Ti-Pure ® R-706 (DuPont) 12 Calcined kaolin CK-400 (Jiaoling Guangfu) 7
• Film forming emulsions brand name VINNAPAS ® EF718, is from Wacker Chemie AG, vinyl acetate-ethylene polymer dispersions, solid content 55 % (w/w) , density 1.07g/mL, viscosity 150-650mPa»s (Brookfield Viscometer No. 2 rotor 60 rpm)
• the coating example 1 and 2 which are made in coating system 1 and the coating comparison example 1 are stored in oven for 30 day under 50 ° C, then measure the stability. See the following table for the viscosity stability and pH stability of the system:
• Coating examples 1 and 2 show that the scrubbing resistance of the coating products (Coating examples 1 and 2) can be significantly improved by adding the composite of potassium methyl silicate and functional silane. There is a significant improvement of scrubbing resistance compared with the coating comparison example 1 in which only potassium methyl silicate is added. Increasing the amount of functional silane in a certain range can significantly improve the scrubbing resistance of the product .
• Coating system 2 vinyl acetate-ethylene VAE emulsion system
• VINNAPAS ® EZ 3010 is vinyl acetate-ethylene polymer emulsion from Wacker Chemie AG, normal viscosity 2700-5900 mPa . s , density 1.06g/ cm 3 .
• Coating examples 6-13 all possess good pH stability; after one month storage in 50 ° C, the change of viscosity is within +5KU, which is in compliance with the national standard.
• Scrubbing resistance data of coating examples 17-23 and coating comparison example 2 are as follows: Average wet scrubbing cycles
• VINNAPAS ® EZ 3010 is vinyl acetate-ethylene polymer emulsion from Wacker Chemie AG, normal viscosity 2700-5900 mPa.s, density
• coating example 3 prepared according to this invention is better than coating comparison example 3 which is prepared using the best pH regulator AMP95 in the current market.
• Coating system 4 acetate-acrylic emulsions system
• NaPoly ® 7188 acetate-acrylic dispersion is solid content 55 % (w/w) , normal viscosity 500-2000 mPa.s, density 1. lg/ cm 3 .
• coating system 4 acetate-acrylic system
• the scrubbing resistance of coating examples 4 and 5 which containing pH regulators from this invention is much better than coating comparison example 4 which containing AMP 95 as pH regulator.
• the performance can be improved by 30 % or more.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50693636

Family Applications (1)

Country Status (3)

Families Citing this family (5)

Family Cites Families (7)

• 2013
  • 2013-05-04 CN CN201310175055.1A patent/CN104130620A/zh active Pending
• 2014
  • 2014-04-28 WO PCT/EP2014/058567 patent/WO2014180690A1/en active Application Filing
  • 2014-04-28 EP EP14723369.6A patent/EP2992059A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events