WO2010057628A1 - Oberflächenbehandelte titandioxid-pigmente für kunststoffe und verfahren zur herstellung - Google Patents
Oberflächenbehandelte titandioxid-pigmente für kunststoffe und verfahren zur herstellung Download PDFInfo
- Publication number
- WO2010057628A1 WO2010057628A1 PCT/EP2009/008219 EP2009008219W WO2010057628A1 WO 2010057628 A1 WO2010057628 A1 WO 2010057628A1 EP 2009008219 W EP2009008219 W EP 2009008219W WO 2010057628 A1 WO2010057628 A1 WO 2010057628A1
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- WO
- WIPO (PCT)
- Prior art keywords
- titanium dioxide
- pigment
- total
- treated titanium
- layer
- Prior art date
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- 239000000049 pigment Substances 0.000 title claims abstract description 103
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 40
- 229920003023 plastic Polymers 0.000 title claims abstract description 18
- 239000004033 plastic Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 53
- -1 polysiloxanes Polymers 0.000 claims abstract description 36
- 239000010410 layer Substances 0.000 claims abstract description 23
- 239000012044 organic layer Substances 0.000 claims abstract description 20
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 13
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 51
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 31
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 229920006351 engineering plastic Polymers 0.000 claims description 13
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 10
- 229920002545 silicone oil Polymers 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 18
- 239000011248 coating agent Substances 0.000 abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000003921 oil Substances 0.000 abstract 2
- 229910052710 silicon Inorganic materials 0.000 abstract 2
- 239000010703 silicon Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 45
- 238000003756 stirring Methods 0.000 description 39
- 229920000515 polycarbonate Polymers 0.000 description 29
- 239000004417 polycarbonate Substances 0.000 description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 27
- 239000000725 suspension Substances 0.000 description 21
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 15
- 229910001388 sodium aluminate Inorganic materials 0.000 description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 8
- 239000002585 base Substances 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000012065 filter cake Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920001921 poly-methyl-phenyl-siloxane Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920004034 Makrolon® 2408 Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 150000001343 alkyl silanes Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000001636 atomic emission spectroscopy Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 230000019612 pigmentation Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012667 polymer degradation Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- RLQWHDODQVOVKU-UHFFFAOYSA-N tetrapotassium;silicate Chemical compound [K+].[K+].[K+].[K+].[O-][Si]([O-])([O-])[O-] RLQWHDODQVOVKU-UHFFFAOYSA-N 0.000 description 1
- ZSDSQXJSNMTJDA-UHFFFAOYSA-N trifluralin Chemical compound CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O ZSDSQXJSNMTJDA-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3692—Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3684—Treatment with organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Definitions
- the invention relates to titanium dioxide pigments, which are particularly suitable for use in plastics, a process for their preparation and a plastic composition containing these pigments.
- Plastics include a variety of different polymers, in particular one distinguishes the bulk plastics such as polyethylene, polypropylene, polyvinyl chloride, polystyrene or polyurethane from engineering plastics.
- Engineering plastics are characterized by special mechanical and thermal properties, chemical stability and low flammability.
- the engineering plastics include, for example, polycarbonate, polyamide, polyester, polyoxymethylene and acrylonitrile-butadiene-styrene.
- Polycarbonate is a technical plastic that is widely used because of its properties, for example in the automotive sector, in electrical engineering, in the
- CD compact discs
- household appliances electronic components and many more.
- Polycarbonate is a predominantly amorphous transparent, hard elastic plastic and, due to its low water absorption, is particularly suitable as a material for precision parts.
- polycarbonate is characterized by particularly good basic properties such as high toughness and heat resistance and good processability.
- TiO 2 pigment for use in engineering plastics, especially in polycarbonate, are, in addition to the optical properties, good processing properties and good thermostability of the plastic.
- polycarbonate there are a number of commercial pigments that offer a H-siloxane functionalized pigment surface, such as KRONOS K2230 or K2233 pigment grades. These are characterized by a low weather resistance.
- WO 2008/071382 A1 teaches an alternative procedure for the production of an inorganic surface coating with a dense SiO 2 -HII and subsequently an Al 2 O 3 -HuIIe. According to one embodiment of this method, the dense SiO 2 -HuIIe during the sanding of the TiO 2 -based body in a continuous process on the
- EP 1 760 116 A1 describes a titanium dioxide pigment especially for use in engineering plastics, which has a SiO 2 coating and an organic BeSchichtung.
- the organic coating is applied directly to the SiO 2 coating.
- An Al 2 O 3 layer between the SiO 2 and the organic coating is given as unfavorable and occupied by corresponding comparative examples.
- Trimethylolpropane, trimethylolethane, alkylsilanes having 4-10 carbon atoms, polydimethylsiloxane and polymethylhydrogensiloxane are mentioned as organic coating materials.
- the organic coating consists of polymethylhydrogensiloxane.
- a weathering resistance of the plastics produced with these TiO 2 pigments is found to be advantageous.
- the lack of thermally induced discoloration is advantageous.
- the invention has for its object to provide a titanium dioxide pigment with good optical properties and high weather resistance, which leads to a good processing stability of the plastic and good properties of the final product, especially when used in engineering plastics.
- the invention is further based on the object of specifying a production method for such a titanium dioxide pigment.
- the object is achieved in a surface-treated titanium dioxide pigment characterized in that on the surface of the pigment particles from the inside to the outside in succession, a SiO 2 - layer, an Al 2 O 3 layer and an organic layer are applied, wherein the organic layer at least contains a compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes and wherein the total Al 2 O 3 content of the particles is at most 2.4% by weight, based on the total pigment.
- the object is further achieved in a process for the production of surface-treated titanium dioxide pigment particles, characterized by the following steps: a) an aqueous suspension of untreated titanium dioxide particles is subjected to a stirrer grinding, b) Subsequently, in batch mode, a dense SiO 2 layer and an Al 2 O 3 layer are successively applied to the titanium dioxide particles, the total Al 2 O 3 content of the particles being not more than 2.4% by weight Total pigment is and c) then an organic layer containing at least one compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes on the
- the solution of the problem is further in the use of surface-treated titanium dioxide particles in engineering plastics, wherein on the particle surface from the inside to the outside, a SiO 2 layer, an Al 2 O 3 - layer and an organic layer are applied successively, wherein the organic layer contains at least one compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes, and wherein the total Al 2 O 3 content of the particles is at most 2.4% by weight, based on the total pigment.
- the invention relates to a weather-stable titanium dioxide pigment which is readily dispersible and suitable for use in plastics, in particular in engineering plastics.
- the pigment particles according to the invention are provided from the inside to the outside with an SiO 2 layer, an Al 2 O 3 layer and an organic layer.
- the SiO 2 layer is located preferably in an amount of 0.5 to 5.0 wt .-% SiO 2 , in particular 2.0 to 2.5 wt .-% SiO 2 based on the total pigment before.
- the SiO 2 layer is present as a so-called dense SiO 2 shell, wherein a "dense SiO 2 -HuIIe" is characterized by the sulfuric acid solubility test as in the article by Helmut Weber "silica as a constituent of titanium dioxide pigments" (Kronos Information 6.1 , 1978).
- Sulfuric acid solubility of a dense SiO 2 -HCl 2 is therefore preferably less than about 10% by weight.
- the total aluminum content of the pigment is at most 2.4 wt .-% calculated as Al 2 O 3 based on total pigment, preferably at most 2.0 wt .-% and in particular 1, 6 to 1, 8 wt .-% Al 2 O. 3 .
- Higher aluminum contents than 2.4% by weight of Al 2 O 3 lead to a deterioration in the processing stability of the plastic and in the properties of the end product.
- the TiO 2 pigment particles according to the invention are provided on the outside with an organic layer which contains at least one compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes.
- a suitable H-siloxane is, for example, polymethylhydrogensiloxane.
- silicone oils are, for example, polydimethylsiloxanes, polymethylalkylsiloxanes having C 2 -C 14 -alkyl groups or polymethylphenylsiloxanes and, for example, dimethylsiloxane-based copolymers with methylalkylsiloxanes having C 2 -C 14 -alkyl groups and methylphenylsiloxanes.
- Organically functionalized polysiloxanes in the context of the invention are polysiloxanes which contain organic groups such as, for example, alkyl, alkoxy, vinyl or amino groups.
- organic groups such as, for example, alkyl, alkoxy, vinyl or amino groups.
- this exemplary listing should not be construed as limiting the invention.
- the organic layer consists of polymethylhydrogensiloxane and polydimethylsiloxane.
- the inventive method is based on an aqueous suspension of untreated titanium dioxide particles (TiO 2 basic body).
- the particles are preferably derived from the
- Aluminum doping is usually about 0.8 to 1, 5 wt .-% calculated as Al 2 O 3 and preferably about 1, 2 wt .-% Al 2 O 3 .
- the aqueous suspension of titanium dioxide particles is ground in an agitating mill in a manner known to those skilled in the art. For example, a pH of about 11 is set before grinding.
- the ground suspension is transferred to a stirred vessel and heated to a temperature of about 40 to 90 0 C, preferably 60 to 80 0 C.
- the particles are provided in a batch process with a dense SiO 2 -HII and subsequently with an Al 2 O 3 -HuIIe.
- the suspension is first added alkali metal silicate in the form of sodium or potassium water glass. The addition is carried out in one or more stages with known technical methods.
- the pH is lowered by addition of suitable substances to about 3 to 8, preferably about 4.
- suitable substances for example HCl, known.
- an Al 2 O 3 precursor compound for example sodium aluminate
- the addition is carried out in one or more stages with known technical methods.
- a preferred embodiment is the addition of an alkaline Al compound such as sodium aluminate in a fixed pH range, preferably in the range of 4 to 7, by parallel addition of an acidic compound such as HCl or aluminum sulfate.
- Preference is given to 0.1 to about 1, 0 wt .-% Al 2 O 3 based on total pigment, in particular 0.2 to 0.6 wt .-% Al 2 O 3 was added.
- the pH is subsequently adjusted to 4 to 8, preferably with NaOH / HCl or with sodium aluminate / aluminum sulfate.
- the total amount of Al 2 O 3 including the aluminum doping of the main body should not exceed 2.4% by weight, based on the total pigment.
- the surface-treated TiO 2 pigment particles are separated from the suspension by filtration, and the filter cake is optionally washed in order to free it of water-soluble salts.
- the pigment is dried with technically known dryers (for example spray drier, leveler, etc.).
- a thermal treatment is followed at temperatures of 200 to 600 0 C, preferably 300 to 500 0 C in conventional apparatus such as a rotary kiln.
- the organic shell contains at least one compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes.
- a suitable H-siloxane is, for example, polymethylhydrogensiloxane.
- silicone oils which can be used are polydimethylsiloxane or polymethylalkylsiloxanes with C 2 -C 14 -alkyl groups or polymethylphenylsiloxanes, and, for example, dimethylsiloxane-based copolymers with methylalkylsiloxanes with C 2 -C 14 Alkyl groups and methylphenylsiloxanes can be used.
- Suitable organically functionalized polysiloxanes are, for example, vinyl, alkyl, alkoxy or amino functionalized silanes. However, this exemplary listing should not be construed as limiting the invention. In a particular embodiment of the invention, polymethylhydrogensiloxane and polydimethylsiloxane are used.
- the organic coating advantageously takes place during the pigment grinding, which is usually carried out with a steam jet mill, but can also be carried out with other suitable apparatuses for an organic coating.
- the organic coating by means of a steam jet mill the organic coating substances are introduced into the steam mill simultaneously with the pigment.
- the finished pigment contains preferably 0.05 to 1 wt .-%, in particular 0.1 to 0.6 wt .-% of carbon based on the total pigment.
- the pigments treated according to the invention have a better filterability of the filter cake, whereby higher filtration capacities can be realized.
- the filter cake resistance is suitable, which can be determined on the basis of VDI Guideline 2762 (Febr. 1997) on the basis of laboratory experiments. For an overview of the design and evaluation of such experiments, see the publication by JW Tichy "Designed and optimized. Accurate filter tests for solid-liquid separation "(CITplus 10/2005, pp.
- the TiO 2 pigment particles prepared according to the invention are not only better filterable, they also lead, even when used in engineering plastics, in particular in polycarbonate, to no disadvantages with regard to the optical properties or the thermostability of the plastics in comparison to WO 2008 / 071382 A1 (see Example 4 and Comparative Example 2).
- Titanium dioxide pigment particles which are provided from the inside to the outside with a dense SiO 2 layer, an Al 2 O 3 layer and an organic layer, wherein the organic layer comprises at least one compound from the group H-siloxanes, silicone oils and organically functionalized polysiloxanes contains and wherein the total Al 2 O 3 content of the particles is at most 2.4 wt .-% based on the total pigment, are well suited for use in engineering plastics, especially in polycarbonate.
- Example 1 (coated only with SiO 2 and Al 2 O 3 )
- a sand-milled aqueous suspension of TiO 2 base which had an Al 2 O 3 content of about 1, 2 wt .-% and was prepared by the chloride process, with a TiO 2 - concentration of 350 g / l was at 70 0 C. adjusted to a pH of 11 with NaOH. While stirring, 2.2% by weight of SiO 2 was added to the suspension as sodium water glass. After a stirring time of 15 minutes, the pH was lowered to a value of 4 with stirring within 70 minutes.
- the TiO 2 suspension was filtered and freed by washing of water-soluble salts.
- the washed filter paste was dried in a floor dryer at 160 0 C and then thermally treated at 420 ° C for 2 hours.
- the product was milled in a mortar mill (Pulverisette) at 10 g / 10 min.
- Example 2 A sand-milled aqueous suspension of TiO 2 base, which had an Al 2 O 3 content of about 1.2% by weight and was prepared by the chloride process, with a TiO 2 - Concentration of 350 g / l was adjusted at 70 0 C with NaOH to a pH of 1 1. While stirring, 2.2% by weight of SiO 2 was added to the suspension as sodium water glass. After a stirring time of 15 minutes, the pH was lowered to a value of 4 with stirring within 70 minutes. After a further stirring time of 15 minutes, 0.4% by weight of Al 2 O 3 was added as sodium aluminate, the pH being kept at 4 by the parallel addition of HCl.
- the pH was adjusted to a value of 5.5 with 0.1% by weight of Al 2 O 3 as sodium aluminate.
- the TiO 2 suspension was filtered and freed by washing of water-soluble salts.
- the washed filter paste was dried in a spray dryer at 110 0 C and then thermally treated at 420 0 C for 2 hours.
- the thermally treated product was then subjected to steam milling with the addition of polymethylhydrogensiloxane.
- the carbon content of the TiO 2 particles was 0.2 wt .-% based on pigment.
- a sand-milled aqueous suspension of TiO 2 base which had an Al 2 O 3 content of about 1, 2 wt .-% and was prepared by the chloride process, with a TiO 2 - concentration of 350 g / l was at 70 0 C. adjusted to a pH of 11 with NaOH. While stirring, 2.2% by weight of SiO 2 was added to the suspension as sodium water glass. After a stirring time of 15 minutes, the pH was lowered to a value of 4 with stirring within 70 minutes.
- Polydimethylsiloxane (0.1 wt .-% C based on pigment) subjected to a steam grinding.
- the carbon content of the TiO 2 particles was 0.4 wt .-% based on pigment.
- Example 4 A sand-milled aqueous suspension of TiO 2 base, which had an Al 2 O 3 content of about 1.2% by weight and was prepared by the chloride process, with a TiO 2 - Concentration of 350 g / l was adjusted at 70 0 C with NaOH to a pH of 11. While stirring, 2.2% by weight of SiO 2 was added to the suspension as sodium water glass. After a stirring time of 15 minutes, the pH was lowered to a value of 4 with stirring within 70 minutes. After a further stirring time of 15 minutes, 0.4% by weight of Al 2 O 3 was added as sodium aluminate, the pH being kept at 4 by the parallel addition of HCl.
- the pH was adjusted to a value of 5.5 with 0.1% by weight of Al 2 O 3 as sodium aluminate.
- the TiO 2 suspension was filtered and freed by washing of water-soluble salts.
- the washed filter paste was dried in a rack drier at 160 0 C.
- the dried product was then subjected to the addition of polymethylhydrogensiloxane (0.3 wt .-% C based on pigment) and polydimethylsiloxane (0.3 wt .-% C based on pigment) subjected to steam milling.
- the carbon content of the TiO 2 particles was 0.6 wt .-% based on pigment.
- a sand-milled aqueous suspension of TiO 2 base which had an Al 2 O 3 content of about 1.2% by weight and was prepared by the chloride process, with a TiO 2 -
- the TiO 2 suspension was filtered and freed by washing of water-soluble salts.
- the washed filter paste was dried in a rack drier at 160 0 C.
- Comparative Example 2 An aqueous suspension of TiO 2 base having an Al 2 O 3 content of about 1.2
- the suspension was then diluted with water to 350 g / l, heated to 70 ° C, 1, 7 wt .-% SiO 2 added as sodium water glass and adjusted with stirring with HCl within 70 minutes to a pH of 4.
- Polydimethylsiloxane (0.1 wt .-% C based on pigment) subjected to a steam grinding.
- the carbon content of the TiO 2 particles was 0.4 wt .-% based on pigment.
- Comparative Example 3 A sand-milled aqueous suspension of TiO 2 base having an Al 2 O 3 content of about 1.2% by weight and prepared by the chloride method with a TiO 2 concentration of 350 g / l became 70 0 C with NaOH adjusted to a pH of 11. While stirring, 2.2% by weight of SiO 2 was added to the suspension as sodium water glass. After a stirring time of 15 minutes, the pH was lowered to a value of 4 with stirring within 70 minutes.
- the dried product was then subjected to the addition of polymethylhydrogensiloxane (0.3 wt .-% C based on pigment) and polydimethylsiloxane (0.3 wt .-% C based on pigment) subjected to steam milling.
- the carbon content of the TiO 2 particles was 0.6 wt .-% based on pigment.
- the BET surface area of the pigment is measured using a Tristar 3000 from Micromeritics according to the static volumetric principle.
- the optical properties L * and b * are determined on the injection molded bodies with a GretagMacbeth spectrometer (d / 8 °, D65).
- a decreasing L * value or an increasing b * value indicate molecular changes of the polymer.
- the measurement of the volume flow index MVR (MeIt Volume Rate) according to DIN EN ISO 1133 is carried out with crushed polycarbonate injection molded parts, with the difference that it is heated to 280 ° C. instead of 300 ° C.
- An increase in the MVR value means increased degradation of the polymer and thus degraded properties of the final product.
- Table 2 shows the test results for the polycarbonate properties.
- the color hue b * of the polycarbonate pigmented with the pigments according to the invention (Examples 2, 3, 4) is slightly improved compared to the commercial polycarbonate pigment Kronos 2233, as is the volume flow index MVR.
- In comparison to a surface-treated in the sand mill TiO 2 pigment (Comparative Example 2) equal good polycarbonate properties are achieved with the pigments of the invention.
- there are advantages in pigment production in terms of filterability see Fig. 1).
- Polycarbonates pigmented with pigments having an Al 2 O 3 content above 2.4% by weight (Comparative Example 3) have degraded optical properties (b * ) and processing stability (MVR).
- the titanium dioxide pigment provided with the surface coating according to the invention is more weather-stable than the commercial pigments and improves the processing stability of engineering plastics, in particular of polycarbonate.
- the method according to the invention for applying the inorganic surface coating to the sandmill coating method has advantages in filter cake filtration.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0921100A BRPI0921100A2 (pt) | 2008-11-20 | 2009-11-18 | pigmentos de dióxido de titânio tratados na superfície para matérias sintéticas e processos para produção |
AU2009317581A AU2009317581A1 (en) | 2008-11-20 | 2009-11-18 | Surface-treated titanium dioxide pigments for plastics and method for production |
JP2011536772A JP2012509371A (ja) | 2008-11-20 | 2009-11-18 | 表面処理されたプラスチック用二酸化チタン顔料、及びその製造法 |
EP09764448A EP2358821A1 (de) | 2008-11-20 | 2009-11-18 | Oberflächenbehandelte titandioxid-pigmente für kunststoffe und verfahren zur herstellung |
CN200980146018XA CN102216398A (zh) | 2008-11-20 | 2009-11-18 | 应用于塑料的经表面处理的二氧化钛颜料及其制备方法 |
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DE102008058351A DE102008058351A1 (de) | 2008-11-20 | 2008-11-20 | Oberflächenbehandelte Titandioxid-Pigmente für Kunststoffe und Verfahren zur Herstellung |
DE102008058351.0 | 2008-11-20 |
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WO2010057628A1 true WO2010057628A1 (de) | 2010-05-27 |
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PCT/EP2009/008219 WO2010057628A1 (de) | 2008-11-20 | 2009-11-18 | Oberflächenbehandelte titandioxid-pigmente für kunststoffe und verfahren zur herstellung |
Country Status (10)
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US (1) | US20100125117A1 (de) |
EP (1) | EP2358821A1 (de) |
JP (1) | JP2012509371A (de) |
KR (1) | KR20110100223A (de) |
CN (1) | CN102216398A (de) |
AU (1) | AU2009317581A1 (de) |
BR (1) | BRPI0921100A2 (de) |
DE (1) | DE102008058351A1 (de) |
TW (1) | TW201026790A (de) |
WO (1) | WO2010057628A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102443283A (zh) * | 2010-10-14 | 2012-05-09 | 上海澎博钛白粉有限公司 | 一种化纤钛白粉的制浆工艺 |
EP3607005B1 (de) | 2017-04-05 | 2021-04-14 | Venator Uerdingen GmbH | Pigmente die mit mindestens einem polysiloxan behandelt wurden zur verwendung in thermoplasten |
Families Citing this family (15)
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CN102558918B (zh) * | 2010-12-07 | 2014-05-07 | 河南佰利联化学股份有限公司 | 利用晶种制备钛白粉的生产方法 |
US8840719B2 (en) * | 2011-03-09 | 2014-09-23 | Tronox Llc | Titanium dioxide pigments and manufacturing method |
DE102013009390A1 (de) * | 2012-06-29 | 2014-01-02 | Kronos International, Inc. | Verfahren zur Oberflächenbehandlung von anorganischen Pigmentpartikeln |
JP6053444B2 (ja) * | 2012-10-11 | 2016-12-27 | 旭化成株式会社 | 金属酸化物ナノ粒子分散液の製造方法 |
CN103849136B (zh) * | 2012-11-30 | 2016-12-21 | 纳幕尔杜邦公司 | 包含包覆的二氧化钛颗粒的增强的聚合物组合物 |
KR101593732B1 (ko) * | 2012-12-28 | 2016-02-12 | 제일모직주식회사 | 열가소성 수지 조성물 및 이로부터 형성된 성형품 |
EP2987834A1 (de) * | 2014-08-18 | 2016-02-24 | Kronos International, Inc. | Verfahren zur Oberflächenbeschichtung von anorganischen Partikeln mit Siliciumdioxid und mindestens einer weiteren anorganischen Verbindung |
EP3283574A1 (de) * | 2015-04-13 | 2018-02-21 | The Chemours Company TT, LLC | Hitzebeständige titandioxidteilchen und herstellung von kühlen artikeln |
JP6161772B1 (ja) * | 2016-07-29 | 2017-07-12 | 東洋インキScホールディングス株式会社 | ホワイト液体現像剤及びその製造方法、またそれを用いた印刷物 |
WO2019228959A1 (de) | 2018-05-29 | 2019-12-05 | Covestro Deutschland Ag | Opaker mehrschichtkörper aus polycarbonat mit hoher bewitterungsstabilität |
EP3626885A1 (de) * | 2018-09-21 | 2020-03-25 | Kronos International, Inc. | Laminatpigment mit abstandseigenschaften und hoher uv-graustabilität |
KR20210093912A (ko) * | 2018-11-28 | 2021-07-28 | 코베스트로 인텔렉쳐 프로퍼티 게엠베하 운트 콤파니 카게 | 배터리 모듈을 위한 통합된 냉각 요소 |
CN111117299A (zh) * | 2020-01-14 | 2020-05-08 | 长乐力恒锦纶科技有限公司 | 一种缓解预聚塔结垢的二氧化钛消光剂 |
EP4083136A1 (de) | 2021-04-30 | 2022-11-02 | Covestro Deutschland AG | Polycarbonat-zusammensetzungen mit zinksulfid als weisspigment |
CN115895296A (zh) * | 2022-11-24 | 2023-04-04 | 广州市德力塑化工科技有限公司 | 一种有机包膜的钛白粉及其制备方法和应用 |
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EP1760116A1 (de) * | 2004-06-24 | 2007-03-07 | Ishihara Sangyo Kaisha, Ltd. | Titandioxidpigmente, herstellungsverfahren dafür und die pigmente enthaltende harzzusammensetzungen |
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2008
- 2008-11-20 DE DE102008058351A patent/DE102008058351A1/de not_active Withdrawn
-
2009
- 2009-11-05 TW TW098137518A patent/TW201026790A/zh unknown
- 2009-11-17 US US12/619,834 patent/US20100125117A1/en not_active Abandoned
- 2009-11-18 CN CN200980146018XA patent/CN102216398A/zh active Pending
- 2009-11-18 KR KR1020117013984A patent/KR20110100223A/ko not_active Application Discontinuation
- 2009-11-18 AU AU2009317581A patent/AU2009317581A1/en not_active Abandoned
- 2009-11-18 BR BRPI0921100A patent/BRPI0921100A2/pt not_active IP Right Cessation
- 2009-11-18 WO PCT/EP2009/008219 patent/WO2010057628A1/de active Application Filing
- 2009-11-18 EP EP09764448A patent/EP2358821A1/de not_active Withdrawn
- 2009-11-18 JP JP2011536772A patent/JP2012509371A/ja not_active Withdrawn
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CN102443283A (zh) * | 2010-10-14 | 2012-05-09 | 上海澎博钛白粉有限公司 | 一种化纤钛白粉的制浆工艺 |
EP3607005B1 (de) | 2017-04-05 | 2021-04-14 | Venator Uerdingen GmbH | Pigmente die mit mindestens einem polysiloxan behandelt wurden zur verwendung in thermoplasten |
Also Published As
Publication number | Publication date |
---|---|
JP2012509371A (ja) | 2012-04-19 |
DE102008058351A1 (de) | 2010-06-02 |
KR20110100223A (ko) | 2011-09-09 |
CN102216398A (zh) | 2011-10-12 |
BRPI0921100A2 (pt) | 2016-02-16 |
TW201026790A (en) | 2010-07-16 |
US20100125117A1 (en) | 2010-05-20 |
EP2358821A1 (de) | 2011-08-24 |
AU2009317581A1 (en) | 2010-05-27 |
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