Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09G—POLISHING COMPOSITIONS; SKI WAXES
  • C09G1/00—Polishing compositions
  • C09G1/02—Polishing compositions containing abrasives or grinding agents

Definitions

• the present invention relates to a painted surface treating composition, a painted surface treating method and a painted surface patching method, and particularly, to a composition for treating a painted surface with low glossiness, especially a grinding paste for painted surface with low glossiness, as well as a painted surface treating method and a painted surface patching method utilizing this painted surface treating composition.
• Matte surfaces are an important application representation in the coating and paint industry. In daily life, the articles with matte effect can be seen everywhere: they can be encountered in home, on the road to work, or in restaurants under curtain of night. Indoor furniture mostly utilizes a matte surface and the wooden boards coating the exterior of eateries also basically have matte appearances. When being confronted with the choice for a glossy effect or a matte effect, we are not only limited to a demand of style and appearance. The practice has proved that the demands in the aspects of cleaning ability, glossy effect and touch or feeling or the like also affect our choice. When we go to offices, whether by driving, by bus, or by train, we will find that the inner decorative surfaces of various vehicles are basically matte surfaces. In view of the aspects of actual use and safety, the blackboards in schools all utilize matte surfaces to avoid glare. The interior of automobiles also utilize that kind of design, and in view of safety, some economical and practical devices and inner decorations all utilize the dull flat paints.
• Anti-light reflection is a subject with significant meaning.
• the surfaces of skyscrapers are generally not coated with the gloss coatings, instead, pre-painted boards are coated on the substrates of steel or aluminum, and additionally, matte coatings are used without exception so as to avoid producing dangerous light reflection to stimulate the eyes of passengers or drivers.
• Matte finish is a method for obtaining a painted surface with low glossiness.
• the storage life and condition of the paint are all more rigorous than those of the ordinary paints.
• U.S. Patent Application Publication No. 2001/0056146 discloses a mixed preparation agent which can obtain a matte effect on the surfaces of floor and culinary surfaces. However, the duration of the matte effect produced by the preparation agent is limited.
• EP Patent No. 1013731 discloses a mixed solvent containing a polymeric film- forming agent which can also obtain a matte effect.
• the usage of solvent limits the application range thereof.
• U.S. Patent Application Publication No. 2005/0166464 is also a grinding paste containing an abrasive, however, it can only obtain a painted surface effect with high glossiness.
• the invention obtains a new grinding paste with low glossiness by selecting an abrasive with appropriate particle size and hardness.
• the invention provides a painted surface treating composition which includes a dispersed medium and an abrasive dispersing in the dispersed medium, wherein said abrasive has an average particle diameter of 12-55 ⁇ m and a Mohs' hardness of 5.5-6.
• the painted surface treating composition of the invention further comprises a rheological agent of anionic hydrophobic-modified acrylic alkali- swelling thickening agent or the like.
• said dispersed medium is an environmentally friendly water-oil dispersion emulsion.
• said abrasive comprises 35-50% of the total weight of the system. According to certain embodiments, in the painted surface treating composition of the invention, said abrasive is pyrolutite.
• the particle diameter distribution D 90 of said abrasive is between 30-110 ⁇ m.
• the invention further provides a painted surface treating method including applying the painted surface treating composition of the invention on a substrate.
• Still another aspect of the invention provides a painted surface defect patching method including applying the painted surface treating composition of the invention on a painted surface to be patched.
• the traditional painted surface treating compositions if there are flaws on the matte painted surface, it can only firstly remove the flaws and then perform an overall re-coating on the surface to obtain a uniform painted surface. If the painted surface grinding paste with low glossiness of the invention is used, it is only demanded to perform a treatment in a small range to obtain a uniform surface effect.
• Figure Ia is a schematic view of light reflection routes on a surface with high glossiness
• Figure Ib is a schematic view of light reflection routes on a matte surface
• Figure Ic is a schematic view of light reflection routes on a matte surface with sand marks.
• Figure 2 is a particle diameter distribution diagram of HP 40/N abrasives; the particle size distribution thereof is relatively narrow and concentrated, and the average particle size thereof is 54 ⁇ m.
• Figure 3 is a particle diameter distribution diagram of Dymco-325 abrasives; the particle size distribution thereof is relatively narrow and concentrated, and the average particle size thereof is 38 ⁇ m.
• Figure 4 is a particle diameter distribution diagram of LHM-325 abrasives; the particle size distribution thereof is relatively narrow and concentrated, and the average particle size thereof is 15 ⁇ m.
• Figure 5 is a particle diameter distribution diagram of Double Cream Tripoli diatomite abrasives; the particle size distribution thereof is relatively- wide, and the average particle size thereof is 25 ⁇ m.
• the invention provides a painted surface treating composition (that is, a painted surface treating composition) which includes a dispersed medium and an abrasive dispersing in the dispersed medium, wherein said abrasive has an average particle diameter of 12-55 ⁇ m and a Mohs' hardness of 5.5-6.
• abrasives with small particle diameters will be produced due to the breakage and deformation of said abrasives which results in a very small change in glossiness and even the appearance of high glossiness, just like the polishing coarse grinding paste being sample #4; and an alumina abrasive with a Mohs' hardness of 6 or more has excellent polishing property when the particle size thereof is small, however, sand marks will be left when the particle size of the abrasive is 20-30 ⁇ m, just like the polishing coarse grinding paste being sample #5 described later.
• the hardness in the invention is the Mohs' hardness measured according to the traditional methods such as the national correlative standards.
• the Mohs' hardness is a standard for indicating the hardness of minerals.
• a scratching method By applying a scratching method, a scratching is produced by scratching the surface of a tested mineral using a pyramid-shaped diamond drill bit, and customarily, the Mohs' hardness is used in mineralogy and gemology.
• the hardness is classified into 10 grades using the measured depths of the scratchings: talc 1 (the smallest hardness), gypsum 2, calcite 3, fluorite 4, apatite 5, (feldspar; orthoclase; periclase) 6, quartz 7, topaz 8, corundum 9, diamond 10.
• the painted surface treating composition of the invention further comprises a rheological agent.
• the rheological agent include, but are not limited to, anionic hydrophobic-modified acrylic alkali- swelling thickening agents or the like.
• said dispersed medium is an environmentally friendly water-oil dispersion emulsion.
• the oil has a grinding aiding property, which can adjust the volatility so as to ensure that there is solvent in the process of the polishing process and the dry grinding of the abrasives will not occur; and simultaneous, can further ensure that the solvent can be removed easily after polishing.
• the solvent content is low and therefore there is small harm to the environment.
• said abrasive comprises 35-50% of the total weight of the system.
• said abrasive is pyrolutite. Because pyrolutite has a particulate shape with obvious contour and stereo property, the grinding efficiency thereof is very high.
• the natural pyrolutite is a porous glassy acidic rock formed by the cooling of magma after volcano breaking forth, which has relatively many air pores, a very small relative density comparing with water such that it is capable of being floated on water, and is often appeared in nature in a manner of white or gray.
• Pyrolutite is a pure natural grinding material, which is nonflammable, corrosiveless, water absorbable and gas passable, and has a light weight.
• the particle diameter distribution D 90 of said abrasive is between 30-110 ⁇ m.
• This particle diameter distribution is a highly concentrated particle size distribution. Because the particle size distribution thereof is relatively narrow and concentrated, it favors the uniformity of the surface of the work piece after actual grinding. Thereby, it will neither leave sand marks of large particles nor produce high light effect of the micro-powder particles.
• the invention further provides a painted surface treating method including applying the painted surface treating composition of the invention on a substrate.
• Still another aspect of the invention provides a painted surface defect patching method including applying the painted surface treating composition of the invention on a painted surface to be patched.
• the painted surface treating composition of the invention on a painted surface to be patched.
• the Particle diameter and particle diameter distribution were tested by a JIS R6012 Coulter particle diameter counter.
• Rheological agent an anionic hydrophobic-modified acrylic alkali-swelling thickening agent.
• HESS pyrolutite HP4 O/N KC-009 (with an average particle size of 54 ⁇ m)
• HESS pyrolutite Dymco325 KC-006 (with an average particle size of 38 ⁇ m)
• HESS pyrolutite LHM-325 KC-003 (with an average particle size of 15 ⁇ m), all provided by Dymco Co. Ltd., Shanghai.
• Mohs' hardness 5.5-6.0; acid-base property: 7.2; radiating energy: 0; combustion loss: 5%; Fe iron: without blue color; aqueous substance: 0.15%; acidic substance: 2.9%; softening temperature: 900 degree.
• SiO 2 70.5%; Al 2 O 3 : 13.5%; Fe: 0.1%; Fe 2 O 3 : 1.1%; H 2 O: 3.4%; Na: 1.6%; K: 1.8%; Ca: 0.8%; TiO 2 : 0.2%; SO 3 : 0.1%; MgO: 5%.
• a grinding dispersion emulsion was formulated according to the formula shown in Table 1. Under a condition of moderate speed (400-800 rounds/minute) stirring with a stirrer, the raw materials were added into a container successively according to the order and proportion shown in Table 1. After all of the raw materials had been added, the mixture was stirred for 15-20 min under a high rotating speed (1200-1600 rpm). Therefore, a stable grinding dispersion emulsion with an acid-base degree between 8.6 and 9.0 was obtained.
• Table 1 The composition of a grinding dispersion emulsion
• the painted surface treating compositions obtained in examples 1-3 were coated respectively on automobile painted surfaces and the glossiness change on the automobile painted surfaces was measured.
• the grinding paste was coated uniformly on a 3M 85078 white wool ball (2 grams), and a metal plate sprayed with an automobile painted surface was burnished for 15 sec using a 7403 burnisher under a pressure of 3 pounds, and then the surface of the painted surface was cleaned with a soft cloth. Then, a measurement was performed using a vancometer.
• Wood painted surfaces were treated with the painted surface treating compositions obtained in examples 1-3 respectively and the glossiness change on the wood painted surfaces was measured.
• An ultrafme wire wool (3 M Ultra Fine) was fit on a 30 pound vibrating burnisher. After being sprayed with clean water, the painted surface was burnished 3 times to obtain a uniform surface. Then, the grinding paste was coated uniformly on a 3 M white wire wool (Type T) and the painted surface was burnished for 3-4 times using a 30 pound vibrating burnisher. The surface of the painted surface was cleaned with a soft cloth. Then, a measurement was performed using a vancometer.
• Sample #1 had very minute scratchings after polishing. Scratching could not be observed in sample #2 after polishing. Scratching could not be observed in sample #3 after polishing. Generally speaking, it could be proved after testing that the samples #1, #2 and #3 could make glossiness decrease about 30°. Simultaneously, this system was stable under a condition of room temperature and sealing. The utilizing process thereof was the same as that of the generally used painted surface patching system at present and could be used on the wood furniture painted surfaces and automobile painted surfaces conveniently.
• painted surface treating compositions of the invention were formulated according to the formulas in the following Table 5-1 (example 4), Table 5-2(example 5) and Table 5-3 (example 6).
• the painted surface treating compositions obtained in examples 4-6 were coated respectively on automobile painted surfaces and the glossiness change on the automobile painted surfaces was measured.
• the grinding paste was coated uniformly on a 3M 85078 white wool ball (2 grams), and a metal plate sprayed with an automobile painted surface was burnished for 15 sec using a 7403 burnisher under a pressure of 3 pounds, and then the surface of the painted surface was cleaned with a soft cloth. Then, a measurement was performed using a vancometer.
• the glossiness of the paint on the carpentry surface could be about 40.
• a painted surface treating composition of comparative example 1 was formulated according to the formula shown in Table 7-1.
• the correlative physical properties of Double Cream Tripoli diatomite were as follows: Mohs' hardness : ⁇ 5.5; acid-base property: 6.2-7.0; melting temperature 1707 0 C; average particle diameter: 24 ⁇ m (all of them were supplied by the supplier).
• the testing results of glossiness thereof were listed in Table 8 and Table 9.
• a painted surface treating composition of comparative example 2 was formulated according to the formula shown in Table 7-2.
• the alumina was supplied by Quanzhou Huaming Trading Co., Ltd., and had a Mohs' hardness of 7.5-8.0 and an average particle diameter of 20-30 ⁇ m (both were supplied by Quanzhou Huaming Trading Co., Ltd.).
• the testing results of glossiness thereof were listed in Table 8 and Table 9.
• Table 7-1 The component formula of a polishing coarse grinding paste being sample #4
• Table 7-2 The component formula of a polishing coarse grinding paste being sample #5
• sample #4 and sample #5 both would change the surface glossiness of the metal paint. However, some scrapes would appear in sample #5.
• the data of sample #4 were shown in Table 9 which indicated that sample #4 could make the glossiness of the painted surface reach about 60-70 and had a certain effect for increasing the glossiness.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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• 2008
  • 2008-05-26 CN CNA2008100989780A patent/CN101591510A/zh active Pending
• 2009
  • 2009-04-27 WO PCT/US2009/041787 patent/WO2009151802A2/en not_active Ceased
  • 2009-04-27 EP EP09763093A patent/EP2297264A4/en not_active Withdrawn
  • 2009-04-27 US US12/937,281 patent/US20110203185A1/en not_active Abandoned
  • 2009-04-27 JP JP2011511679A patent/JP2011522918A/ja active Pending

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