KR20140052698A - Composition of e-co friendly silicone-acrylic paint - Google Patents
Composition of e-co friendly silicone-acrylic paint Download PDFInfo
- Publication number
- KR20140052698A KR20140052698A KR20120119119A KR20120119119A KR20140052698A KR 20140052698 A KR20140052698 A KR 20140052698A KR 20120119119 A KR20120119119 A KR 20120119119A KR 20120119119 A KR20120119119 A KR 20120119119A KR 20140052698 A KR20140052698 A KR 20140052698A
- Authority
- KR
- South Korea
- Prior art keywords
- weight
- parts
- silicone
- soluble silicone
- varnish composition
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/06—Acrylates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Paints Or Removers (AREA)
Abstract
Description
The present invention relates to an environmentally-friendly water-soluble silicone-acrylic varnish composition, and more particularly, to a high-performance environmentally-water-soluble silicone-acrylic varnish composition containing recyclable environmentally friendly waste resources.
As the industrialization society progresses, it is reported that modern people live more than 85% of the day in enclosed indoor space.
The living pattern in the closed space became the cause of the interest in the indoor air quality, and it became an opportunity to attract a lot of attention to the volatile organic compounds which are the main cause of indoor air pollution. Volatile organic compounds (VOCs) are generated in various places in the living environment. Especially, it is known that the sources of VOCs occur in a closed space mostly in paints, adhesives and various chemicals. These volatile organic compounds have many adverse effects on the human body and are considered to be a major cause of health threat to modern people.
This problem is caused by a large amount of waxy materials. However, existing waxy waxy products cause many problems as they are used in general industrial processes as well as in our living environment. These problems are caused by organic solvents It emits volatile organic compounds, which are air pollutants, and is found to be a serious problem releasing various wastes generated during the coating process.
In general, the wall of a building is painted with paint or applied with a cement mixture to improve weatherability, corrosion resistance, chemical resistance, or to form a beautiful surface. Conventional wax materials related to this technology are organic waxes based on synthetic resins for various paints such as phenol resin, alkyd resin, acrylic resin and the like. The wax is used by dissolving in water or dissolving in organic solvent , What is dissolved in water is referred to as a water-soluble organic solvent.
However, such an organic waxy material as described above does not have elasticity in accordance with temperature changes, such as steel products, concrete structures, copper structures, etc., which are in contact with the outside air in spite of their water and oiliness, and they are cracked and peeled Rust and so on.
In addition, the organic waxy material has fluidity or toxicity due to mixing, which is a cause of allergy and is a serious problem of safety and air pollution.
This problem can not be solved by using an organic-based varnish, and it has been noted that a synthetic resin for a paint which is used as a main component of an organic varnish is replaced or an inorganic varnish is used as a main component of a hydraulic varnish .
However, in comparison with the organic paint, the inorganic material of the inorganic paint is inferior in adhesiveness, and the material is easily broken due to the weakness of the material. Thus, the anti-corrosive effect is insufficient and the cleaning performance of the air pollution is also problematic.
As a result of efforts to solve these problems, the present inventors have developed a high-performance, environmentally-friendly water-soluble silicone-acrylic varnish composition containing recyclable eco-friendly waste resources, and completed the present invention.
Accordingly, an object of the present invention is to provide an environmentally-friendly water-soluble silicone-acrylic varnish composition having an antibacterial effect and an air purification function by adding a mineral composition.
Another object of the present invention is to provide an environment-friendly water-soluble silicone-acrylic varnish composition which generates far-infrared rays and anions by using an inorganic material which is an environmentally-friendly waste resource.
Another object of the present invention is to provide an environmentally friendly environmentally-soluble water-soluble silicone-acrylic varnish composition which can reduce the production cost by adding recyclable eco-friendly inorganic waste material.
Another object of the present invention is to provide an eco-friendly water-soluble silicone-acrylic varnish composition which is easy to use and harmless to human body by using water as a solvent.
In order to achieve the object of the present invention described above, the present invention provides an environmentally-friendly water-soluble silicone-acrylic wax including a binder including hydraulic cement and aggregate, a mineral composition, talc, an organic thickener, an adsorbent, an inorganic material, Lt; / RTI >
In addition, the present invention relates to a cement admixture comprising 2 to 10 parts by weight of a mineral composition, 10 to 15 parts by weight of talc, 5 to 10 parts by weight of an organic thickener, 5 to 10 parts by weight of an adsorbent, To 15 parts by weight of silicon, 5 to 20 parts by weight of silicon, 10 to 30 parts by weight of acrylic and 1 to 3 parts by weight of pigment.
In a preferred embodiment, the binders are mixed in a weight ratio of 1: 1 to 3: 1.
In a preferred embodiment, the organic thickener is any one selected from cellulose ether, ethyl cellulose, polyvinyl alcohol and synthetic resin emulsion.
In a preferred embodiment, the adsorbent is at least one selected from zeolite, bentonite, activated carbon, silica gel and alumina.
In a preferred embodiment, the inorganic material is at least one selected from coal fly ash, stone powder, and blast furnace slag.
In a preferred embodiment, the fly ash is at least one of fly ash and bottom ash.
In a preferred embodiment, the above-mentioned abrasive is at least one selected from the group consisting of ilite, pozzolan, ceramic powder, jade, loess, dolomite and calcite.
In a preferred embodiment, the mineral composition comprises 65 to 70% by weight of rare earth, 10 to 15% by weight of zinc oxide or titanium dioxide, and 15 to 20% by weight of barium sulfate.
In a preferred embodiment, the rare earth is at least one of monazite, bastesite and genitoite.
The present invention has the following excellent effects.
First, according to the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention, by adding a mineral composition, it has an antibacterial effect and an atmospheric purification function.
Further, according to the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention, far-infrared rays and negative ions are generated by adding an inorganic material, which is eco-
Further, according to the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention, production cost is reduced by adding recyclable eco-friendly waste inorganic material.
Further, according to the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention, water is used as a solvent, which is easy to use and harmless to the human body.
Although the term used in the present invention has been selected as a general term that is widely used at present, there are some arbitrary terms selected by the applicant in a specific case. In this case, the meaning written or used in the detailed description part of the invention The meaning must be grasped.
Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
However, the present invention is not limited to the embodiments described herein but may be practiced in other forms.
In order to accomplish the above object, the present invention provides an environmentally-friendly water-soluble silicone-acrylic varnish composition of the present invention, which comprises a hydraulic binder, mineral composition, talc, organic thickener, adsorbent, inorganic material, silicone, And a control unit.
More specifically, the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention comprises 2 to 10 parts by weight of a mineral composition, 10 to 15 parts by weight of a talc, 5 to 10 parts by weight of an organic thickener based on 100 parts by weight of a binder containing hydraulic cement and aggregate 5 to 10 parts by weight of an adsorbent, 10 to 15 parts by weight of an inorganic material, 5 to 20 parts by weight of silicon, 10 to 30 parts by weight of acrylic and 1 to 3 parts by weight of a pigment.
The eco-friendly water-soluble silicone-acrylic varnish composition of the present invention is characterized in that it can be used as a paint for architectural use and metal, including recyclable environmentally friendly waste resources, mineral composition, adsorbent and organic thickener.
Hereinafter, the eco-friendly water-soluble silicone-acrylic varnish composition of the present invention will be described for each component.
First, the environmentally friendly water-soluble silicone-acrylic sealant composition comprises a binder made of hydraulic cement and aggregate.
Hydraulic cement is characterized in that it includes any one of ordinary portland cement, white cement, low heat cement and blast furnace cement. In addition, the aggregate is preferably a powdery recycled inorganic material having at least one or more selected from quartz, waste glass powder, diatomaceous earth, and waste ceramics powder.
The weight ratio of the hydraulic cement and the aggregate of the binder is 1: 1 ~ 3. When the weight ratio is less than 1 times the weight of the hydraulic cement, the bonding strength of the binder deteriorates. When the weight of the binder is more than 3 times, This is because the breakdown phenomenon tends to occur.
Next, the mineral composition comprises 65 to 70% by weight of rare earth, 10 to 15% by weight of zinc oxide or titanium dioxide, and 15 to 20% by weight of barium sulfate.
The rare earth may be any one of monazite, bastesite and genoite. Monazite, a phosphite mineral with rare earth elements of cerium, and bastesite, which is the most abundant carbonate mineral, and genotypes belonging to tetragonal system are mixed with functional minerals as far-infrared and anion-generating minerals, and are used as paints and coatings.
In addition, zinc oxide plays a role of preservation and antibacterial effect, and zinc oxide can be replaced by titanium dioxide. Barium sulfate plays a role in absorbing radiation such as X-rays.
The present invention relates to an environmentally-friendly water-soluble silicone-acrylic varnish composition, which is excellent in the ability to remove atmospheric pollutants and release far-infrared rays and anions by including a mineral composition. The mineral composition is added in an amount of 2 to 10 parts by weight . If the addition amount of the mineral composition is less than 2 parts by weight, the ability to remove the air pollutant is lowered, and if it exceeds 10 parts by weight, the durability and the bonding strength are lowered.
Next, the talc is a soft mineral having a Mohs hardness of 1, and is characterized in that it has no swelling property by water or an organic solution, has no ion exchange resistance, and has acid resistance. In addition, when powdered, the viscosity is increased, and it has paint gloss control, durability improvement, oxidation inhibition and corrosion resistance.
It is preferable to add 10-15 parts by weight of talc. If it is less than 10 parts by weight, it is difficult to maintain the thickness of the coating film. If it exceeds 15 parts by weight, durability may be deteriorated and the coating film may be weakened.
Next, the organic thickener is characterized by being selected from among cellulose ether, ethyl cellulose, polyvinyl alcohol and synthetic resin emulsion.
Organic thickener is an organic adhesive which improves workability when applied to metals such as metals, concrete, mortar, board, and non-ferrous metals, and improves workability. After curing, the coating film is flexible and has high tensile strength. Respectively.
The organic thickener is preferably used in an amount of 5 to 10 parts by weight based on 100 parts by weight of the binder. When the amount of the organic thickener is less than 5 parts by weight, the stretchability and the bending strength are lowered.
Next, the adsorbent may use at least one selected from zeolite, bentonite, activated carbon, silica gel, and alumina, and performs adsorption of contaminants.
The adsorbent has an advantage of not emitting organic volatiles and heavy metals, and has an effect of enhancing the antibacterial, fragrance and insecticidal properties of the room.
On the other hand, the adsorbent has the advantage of being able to control the humidity by absorbing and discharging the moisture through the fine pores therein, and having the same thermal expansion coefficient with the structure, and having excellent durability and adhesion characteristics according to external conditions.
Next, the inorganic material is characterized by containing at least one selected from coal fly ash, stone powder, and blast furnace slag.
The fly ash is burned in the thermal power plant and discharged from the boiler together with the flue gas. At this time, the fly ash which collects in the dust collector, and the fly ash or large fly ash falling on the bottom of the boiler is called bottom ash.
The fly ash is an environmentally friendly material that does not generate volatile organic compounds and does not contain harmful heavy metals such as mercury and arsenic. It is also environmentally friendly because it has antibacterial and fragrance functions and is alkaline and recycles waste resources.
The stone used as an inorganic material is a natural mineral mineral and is characterized in that it is contained in the form of powder such as ilite, pozzolan, ceramic powder, jade, loess, dolomite and ungas. It has excellent performance in thermal conductivity, heat reflection and insulation performance.
It is preferable that the blast furnace slag uses a slag having a particle size in the range of 2 to 20 mu m. When the grain size of the crude slag is less than 2 占 퐉, the hardness and strength at the time of melting are lowered. When the particle diameter of the blast furnace slag exceeds 20 탆, the warning is lowered and the evaporation property is not good, which may cause the uniformity.
The blast furnace slag may be produced by any method, but in particular, it is possible to use powdered material by quenching the molten slag generated in the steelmaking process, and the slag itself has latent hydraulic properties. As the alkali bond of the cement, . When cured, a dense tissue is formed, water tightness and durability are improved, and the adsorbability of chlorine (Cl) is excellent.
Next, the added silicon is a high-performance material used in the industrial field, which is made of a chemical material having organic and inorganic properties, is excellent in water resistance and stain resistance, and is harmless to the human body.
The silicone is preferably composed of 5 to 20 parts by weight. If the amount of the silicone is less than 5 parts by weight, water resistance and stain resistance may be deteriorated. If the amount of the silicone is more than 20 parts by weight, it is difficult to mix the composition in the composition, This can happen.
Next, acryl has a property that ultraviolet rays are transmitted well, and there is no discoloration, chemical resistance is good, and water resistance is good.
When acrylic is added in an amount of less than 10 parts by weight, discoloration, chemical resistance and water resistance are lowered and the adhesion of the coating film is lowered. When the amount of acrylic is more than 30 parts by weight When added, the moisture content of the wax becomes high, and it is difficult to apply and dry the wax together with shrinkage.
Next, the pigment is characterized by adding an inorganic pigment. In particular, titanium oxide is preferably used, and it is preferably added in an amount of 1 to 3 parts by weight based on 100 parts by weight of the binder composition. When it is added in an amount of less than 1 part by weight, the coloring state of the paint may not be good, color development may not be achieved on the surface of the composition, and when added in an amount of more than 3 parts by weight, residual components are formed, Lt; / RTI >
The water-soluble silicone-acrylic varnish composition is preferably used as a solvent. When the proportion of water to be added is small, paste forms are solidified at the time of use of the waxy material and are not easy to use. If the proportion of water is too large, So that a phenomenon in which the composition is too thin flows when using the composition.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20120119119A KR20140052698A (en) | 2012-10-25 | 2012-10-25 | Composition of e-co friendly silicone-acrylic paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20120119119A KR20140052698A (en) | 2012-10-25 | 2012-10-25 | Composition of e-co friendly silicone-acrylic paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20140052698A true KR20140052698A (en) | 2014-05-07 |
Family
ID=50885892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR20120119119A KR20140052698A (en) | 2012-10-25 | 2012-10-25 | Composition of e-co friendly silicone-acrylic paint |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20140052698A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106116296A (en) * | 2016-06-24 | 2016-11-16 | 广德县中威新型材料有限公司 | A kind of high tenacity tile adhesives |
| KR101725188B1 (en) * | 2016-07-28 | 2017-04-10 | 김원준 | Eco-friendly ceramic paint composition and method for manufacturing the same |
| WO2019010628A1 (en) * | 2017-07-11 | 2019-01-17 | Dow Global Technologies Llc | Aqueous dispersion and aqueous coating composition comprising the same |
| CN109250956A (en) * | 2018-10-08 | 2019-01-22 | 郭健 | It is a kind of for purifying the wall surface mortar and preparation method thereof of smoking room smoke from cigarette |
| KR20200144993A (en) * | 2019-06-20 | 2020-12-30 | 박인전 | Environmentally Friendly Floor Structure and Its Construction Method |
-
2012
- 2012-10-25 KR KR20120119119A patent/KR20140052698A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106116296A (en) * | 2016-06-24 | 2016-11-16 | 广德县中威新型材料有限公司 | A kind of high tenacity tile adhesives |
| KR101725188B1 (en) * | 2016-07-28 | 2017-04-10 | 김원준 | Eco-friendly ceramic paint composition and method for manufacturing the same |
| WO2019010628A1 (en) * | 2017-07-11 | 2019-01-17 | Dow Global Technologies Llc | Aqueous dispersion and aqueous coating composition comprising the same |
| CN110869449A (en) * | 2017-07-11 | 2020-03-06 | 陶氏环球技术有限责任公司 | Aqueous dispersion and aqueous coating composition comprising the same |
| CN109250956A (en) * | 2018-10-08 | 2019-01-22 | 郭健 | It is a kind of for purifying the wall surface mortar and preparation method thereof of smoking room smoke from cigarette |
| KR20200144993A (en) * | 2019-06-20 | 2020-12-30 | 박인전 | Environmentally Friendly Floor Structure and Its Construction Method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101914473B1 (en) | Composition of eco-friendly functional surface protecting materials for protecting concrete structure and method for protecting surface of concrete structure therewith | |
| KR101636337B1 (en) | Waterproof Lightweight Tile Cement Mortar Composition And Tile Application Method on Concrete Structure Using The Same | |
| KR20140044535A (en) | Composition of e-co friendly inorganic floor coating materials | |
| KR100883583B1 (en) | Antibacterial mortar using natural ceramic mineral | |
| KR20140052698A (en) | Composition of e-co friendly silicone-acrylic paint | |
| JP5818285B1 (en) | A sericite finishing composition for indoor building containing non-toxic adhesive components | |
| KR101931158B1 (en) | Mortar containing phosphoric acid-based ceramic resin composition and method for repairing and surface-protecting a concrete structure using the mortar | |
| KR101180060B1 (en) | Reinforcement compound for concrete structure | |
| Liyana et al. | Effect of fly ash/alkaline activator ratio and sodium silicate/NaOH ratio on fly ash geopolymer coating strength | |
| US20080264302A1 (en) | Curable Composition Containing as Constituent Material Silica Obtained by Decomposing Chrysotile and Cured Object | |
| CN105254278A (en) | Red fly ash sintered brick material | |
| KR101180054B1 (en) | Functional waterproof mortar for inner and outerwall of building | |
| KR20140119319A (en) | Inorganic aqueous binder and inorganic aqueous adhesive comprising the same | |
| US7097706B2 (en) | Non-heating clay composites for building materials | |
| KR101310324B1 (en) | Heat insulating construction method of building wall | |
| KR102259864B1 (en) | Eco-friendly inorganic waterproof coating composition suitable for drinking water standards and applicable to various environments and construction method for waterproof, erosionproof flooring material using the same | |
| KR20140044534A (en) | Composition of e-co friendly inorganic coating materials | |
| KR101745501B1 (en) | Repair and reinforcement for concrete structures | |
| KR100852776B1 (en) | a pro-environment mineral compound and a composition for concrete using the above mineral compound | |
| KR101225500B1 (en) | Room temperature curing type water-soluable inorganic painting composition having excellent water-resistance and method for preparing the same | |
| JP2006327866A (en) | Cement composition | |
| KR101049418B1 (en) | Mineral composition for preventing no and non-organic paint composition thereof | |
| KR100803226B1 (en) | Powder paint composition of various function that is hardened by hychation | |
| KR101646925B1 (en) | Chelate composition for preventing discoloration of surface of panel for construction and panel composition for construction containing the same | |
| JPH11246261A (en) | One pack powdery alkali silicate composition, paste-like alkali silicate solidifying agent using the composition, treatment of industrial waste and polymer product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WITN | Withdrawal due to no request for examination |