Composition for making polishing disk
FIELD: polishing materials.
SUBSTANCE: invention relates to manufacturing cotton polishing disks based on friction effect. The composition for making polishing disks comprises a binding agent aqueous solution wherein an aqueous emulsion of copolymer 15-50% of its total mass is used and prepared by emulasion polymerization of butyl acrylate, ethyl acrylate, methyl methacrylate and acrylic acid amide in the ratio, mas. p. p.: butyl acrylate, 140-160; ethyl acrylate, 140-160; methyl methacrylate, 205-231; acrylic acid amide, 17-19. Invention provides enhancing durability of polishing disks and to reduce cost in their making. Invention can be used for polishing table dishware and their parts made of stainless, devices for dental practice, jewelry articles, watches and so on.
EFFECT: improved and valuable properties of composition.
2 tbl, 9 ex
The invention relates to the production of cotton polishing laps, based on the effect of friction.
It is known the use of an abrasive tool with textile linings resinoid bond, vulcanicola bunch, flexible grinding wheels - elastic tools. Produce polishing wheels on the basis of foamed polyurethane resins and foams, providing the surface roughness 9-11 class /pp.52-57. Kudasov GF Abrasive materials and tools. L., engineering, 1967, 160 C./.
On the performance of the polishing and the roughness of the processed surface has a significant impact as a polishing material basis, the form of its installation in the circle, providing dimensional stability (elasticity) of the terms and composition of the impregnated composition. The selection of optimum design and characteristics of the polishing wheel depend on many factors, including material polished product, the source and the desired surface roughness (purity polishing), price range, etc. Polishing wheels of hard and soft cotton fabric used for preliminary and final processing of Cutlery and stainless steel appliances, appliances for dental practices, products Amateur crafts, jewelry and watches is so
Cotton polishing wheels without proper impregnation and curing impregnating compositions have a small resistance, wear out quickly, which is economically disadvantageous.
JSC “Kyshtym plant abrasives” /Directory. Kyshtym plant abrasive materials. M, VIITAMIN, 1991, 28 S./ to manufacture, for example, svobodnoradikal with metal gear hub polishing laps, uses cotton fabrics and processes them impregnating composition pentaftalevyh varnish PF-587, cured at a temperature of T=81-85°for 4 h Quality polishing products, such as spoons circles 150×10×H impregnated specified composition and dried for 4 h at T=85°meets the requirements of the standard. However, the resistance of ethics circles is very low. So, to scoop a tablespoon resistance equal to 36 thousand units (table 1). In addition, when the impregnation varnish pollute the environment, may cause a fire when drying the impregnated circles.
In the manufacture of the circle of fabric material lay in the metal ring in the role of reinforcement and increasing the strength of the circle. The ring is bore.
The famous “Polymer composition” (As the USSR №642337, C 08 L 29/04, 1979), including ingredients: polyvinyl alcohol, copolymer of vinyl alcohol with vinyl is cetecom, polietilenglikol and quartz sand.
Technical solution No. 652196 (A.S. USSR №642337, C 08 L 29/04, 1979) includes ingredients: aqueous solution of polyvinyl alcohol, an aqueous solution of polyvinyl acetate or (co) polymers of esters of acrylic acid and a plasticizer.
Known composition /Patent # 37304, C 08 L 29/04 1985, Bulgaria is a 3-15% solution of polyvinyl alcohol in water. Circles soaked in this solution, dried at room temperature for 24 h and then at 70°C. the Composition is non-toxic, non-flammable, does not pollute the environment. However, the resistance circles, saturated aqueous solution of polyvinyl alcohol and dried at polishing tablespoons, is up to 29 thousand pieces
The purpose of technical solutions to increase the resilience of the polishing circles by impregnation with an aqueous solution of copolymer (latex obtained by the emulsion polymerization of (meth) acrylic monomers, and lowering the cost of production.
The technical result according to the invention is achieved in that in the composition for manufacturing the polishing circles as the aqueous binder used aqueous emulsion copolymer 15-50% (i.e. 15-50 wt.% the dry copolymer) of total mass obtained by the emulsion polymerization of butyl acrylate, stylability, amide methacrylate and acrylic acid in sootnoshenie is, parts by weight: butyl acrylate - 140-160; acrylate - 140-160; methyl methacrylate - 205-231; amide of acrylic acid - 17-19.
In the implementation of the proposed technical solutions can be used, for example, the following materials:
Copolymer /refer to p.44-45, 406-407, 778-779-chemist's Handbook v.2, L., “Chemistry”, 1971 and str-455 - the encyclopedia of polymers, volume 3. M., Soviet encyclopedia, 1971/;
A copolymer of acrylate /methacrylate (GOST 20370-74), acrylate and butyl acrylate, acrylic acid amide (acrylamide) - their characteristics are listed in the “Catalogue (Meth) acrylic monomers and oligoadenylate”. Cherkasy, 1988/; used In the latex solid content of copolymer 50±5 wt.%.
Fabric material (canvas tent Art. C3720-EX; GOST 29298; 11680; 15530-93:7297-75, 7701-75 etc).
The proposed arrangement provides obtaining cotton circles with high elasticity than the well-known circles of cotton fabrics.
Latex is an aqueous emulsion copolymer may contain surfactants, initiators of polymerization, flame retardants or antiseptic.
The claimed composition is cured at T=130°C for 0.5 hours roughness after polishing circles 150×10×H impregnated proposed composition tablespoons of stainless steel decreases from 0.3 to concave surface to 0.12 and a convex surface to 0.15-0.2 μm. Technology is prepared polished circles on the machine PP-3 with their pre-impregnation on the special patented installation.
The characteristic circles of cotton fabric impregnated with an aqueous solution of a copolymer containing a basic substance in an average of 30-32%, and then dried at T=130°and a comparative evaluation with known characteristics of circles are shown in table 1 and 2.
|N||Name laps||The manufacturer of the circle||The consumption rate of the circles on 1000 PCs||Number of ampoliros. products (thousand pieces) one shaft||Name of product||Quality-relevant standard||Price range, RR|
|1||150×10×H||Lippert-UNIPOL||1,72||56||Spoon, scoop||The standard*||72,2|
|3||150×10×H||According to the claimed invention||1,72||56||-||-||31,11|
|4||120×10×H||Lilbert-UNIPOL||1,3||75||Spoon tea & spoon||-||75,04|
|5||120×10×H||According to the claimed invention||1,3||75||-||-||to 27.88|
|Note: *reference taken purity processing circles of the German firm Lippert-UNIPOL.|
Polishing spoons circles 150×10×H
|No. p.p||Manufacturer of circles||Cleanliness class to polishing, mcm||Roughness after polishing, mcm||Product|
|1||Lippert-UNIPOL||0.15 to 0.2||The release of. on top of the terrain spoons|
|2||The claimed invention||0,3||of 0.15-0.2||-|
|3||Lippert-UNIPOL||0,3||0,12||Bent over the terrain spoons|
|4||According to the claimed invention||0,3||0.12||-|
As can be seen from the tables, the quality of the polished product meets the essential requirements, the circles have a high resistance; they do not burn, do not pollute the atmosphere, easy to dry and no smell.
Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant had not discovered similar, characterized by signs, identical to all the essential features of the claimed technical solution. The definition from the list of identified unique prototype, as the closest together su is the natural enemy of features analog, helped to identify a set of essential in relation to perceived technical result of the distinctive features in the claimed compositions set forth in the claims. Therefore, the claimed invention meets the condition of “novelty.”
To verify compliance of the claimed invention the term “inventive step”, the applicant conducted an additional search of the known solutions that match the distinctive features of the prototype of the characteristics of the claimed composition. The search results showed that the claimed invention not apparent to the expert in the obvious way from the prior art. Not known compositions compositions for the manufacture of polishing wheel, ensuring to achieve the goal, which testifies to the satisfaction of the criterion of “inventive step”.
The claimed technical solution can be used at the enterprises of folk arts and crafts, jewelry and medical industry, it is disclosed in the application materials in sufficient detail for its implementation. Thus, the proposed solution meets the criteria of the invention “industrial applicability”.
The composition for manufacturing the polishing circles containing an aqueous solution of a binder, characterized in that an aqueous solution tie the existing use aqueous emulsion copolymer 15-50% of its total weight, obtained by the emulsion polymerization of butyl acrylate, ethyl acrylate, methyl methacrylate and amide of acrylic acid in the ratio, parts by weight:
The acrylate 140-160
The acrylate 140-160
The methyl methacrylate 205-231
Amide of acrylic acid 17-19
FIELD: soft abrasive materials based on mixed aluminum and iron oxides.
SUBSTANCE: method includes blending of raw components and subsequent heat treatment. Solutions of aluminum and iron sulfate with ammonia bicarbonate admixture heated to 40-600C are used as raw materials to produce slurry of aluminum and iron bicarbonates. Precipitate is separated by filtration, washed and dried. Heat treatment is carried out at 1150-12000C to provide solid solution expressed by general formula Al2-xFexO3, wherein x = 0.30-0.37. Mass part of iron oxide in finished product is 20-25 mass %. Abrasive materials of present invention are useful for finished polishing of metal parts, have polishing ability of 0.37-0.40 mg/min.cm2, provide roughness RZ = 0.07-0.08 mum after polishing and 85-90 %-yield of high-precision accepted metal parts.
EFFECT: environmentally friendly abrasive materials of improved quality.
1 cl, 3 ex, 1 dwg
FIELD: polymer materials.
SUBSTANCE: composition contains, wt %: vinylidene fluoride 20-40, methyl methacrylate homopolymer or copolymer, acryl elastomer 5-18, and UV-absorbing substance 1-4. Invention also discloses jointly extruded films (options) and substrates covered by these films. Invention enables preparing composition with not rising UV-absorbing substances and manufacturing films showing high mechanical strength and providing high-quality adhesion to substrate while being resistant to radiation.
EFFECT: improved consumer's properties of films.
14 cl, 7 ex