CN110951439A - Laminating method of middle polyurethane layer and high-curvature organic glass - Google Patents
Laminating method of middle polyurethane layer and high-curvature organic glass Download PDFInfo
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- CN110951439A CN110951439A CN201911218941.1A CN201911218941A CN110951439A CN 110951439 A CN110951439 A CN 110951439A CN 201911218941 A CN201911218941 A CN 201911218941A CN 110951439 A CN110951439 A CN 110951439A
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- polyurethane layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/06—Polyurethanes from polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
- B29C65/4835—Heat curing adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
- B29C65/527—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by gravity only, e.g. by pouring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
- B29C66/0222—Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4202—Two or more polyesters of different physical or chemical nature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
The invention relates to a laminating method of an intermediate polyurethane layer and a high-curvature organic glass, wherein the intermediate polyurethane layer comprises the following components in percentage by weight: 30-35% of isocyanate; 50-55% of polyester diol; 10-15% of polyester triol; 0.5% of antioxidant; 0.5% of an ultraviolet absorber; and 0.2% of a silane coupling agent. The synthesis method comprises the following steps: taking two pieces of double-curved-surface high-curvature organic glass to be laminated; placing a silicone tube on one circle of the edge of one piece of hyperboloid high-curvature organic glass, covering the other piece of hyperboloid high-curvature organic glass on the silicone tube, forming an accommodating space between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and clamping the two pieces of hyperboloid high-curvature organic glass; adding the intermediate polyurethane layer into a reaction kettle, heating to fully react, and pouring into an accommodating space; and curing the intermediate polyurethane layer and cooling. The laminated double-curved-surface large-curvature organic glass has good optics, excellent bonding force and no bubbles.
Description
Technical Field
The invention relates to an organic glass laminating method, in particular to an intermediate polyurethane layer and a large-curvature organic glass laminating method.
Background
The prior art glazing laminates typically employ glue bonds and Thermoplastic polyurethane elastomer rubber (TPU) film bonds.
For the organic glass which is formed by hot bending and has curvature, if a glue bonding mode is adopted, the conditions of uneven glue thickness, air bubbles, optical deformation and the like are easily caused. Therefore, in the prior art, the organic glass with curvature formed by hot bending is generally laminated by adopting a TPU film bonding method, wherein a TPU film with a fixed thickness is placed between two layers of organic glass, and the organic glass is laminated by a vacuum high-pressure method.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the laminating of the TPU film in the prior art is only limited to the organic glass with smaller radian or single curved surface, and if the TPU film is applied to the organic glass with large curvature of double curved surfaces, the laminating of the TPU film is easy to generate bubbles, and the films are not laid flatly and are deformed optically.
Therefore, a laminating method for the organic glass with large curvature is urgently needed to solve the problems of bubbles, uneven film laying and optical deformation of the organic glass with double curved surfaces and large curvature laminated by the TPU film.
Disclosure of Invention
In order to solve the technical problems in the prior art, the embodiment of the invention provides a coating device and a coating method for the outer surface of hemispherical glass. The specific technical scheme is as follows:
in a first aspect, an intermediate polyurethane layer is provided, wherein the intermediate polyurethane layer comprises the following components in percentage by weight:
30-35% of isocyanate;
50-55% of polyester diol;
10-15% of polyester triol;
0.5% of antioxidant;
0.5% of an ultraviolet absorber; and
0.2% of a silane coupling agent.
In a first possible implementation manner of the first aspect, the isocyanate is dicyclohexylmethane-4, 4-diisocyanate.
In a second possible implementation manner of the first aspect, the molecular weight of the polyester diol is 540-1000.
In a third possible implementation manner of the first aspect, the molecular weight of the polyester triol is 300-600.
In a fourth possible implementation manner of the first aspect, the antioxidant is antioxidant 1010.
In a fifth possible implementation manner of the first aspect, the ultraviolet absorber is UV-328.
In a sixth possible implementation manner of the first aspect, the silane coupling agent is a 1170.
In a second aspect, a method for laminating a high-curvature organic glass is provided, which comprises the following steps:
taking two pieces of hyperboloid high-curvature organic glass to be laminated, and cleaning the surfaces of the two pieces of hyperboloid high-curvature organic glass;
placing a silicone tube on one circle of the edge of one piece of hyperboloid high-curvature organic glass, covering the other piece of hyperboloid high-curvature organic glass on the silicone tube, forming an accommodating space between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and clamping the two pieces of hyperboloid high-curvature organic glass;
adding the intermediate polyurethane layer in any one of the first aspect into a reaction kettle, heating to fully react, and pouring into an accommodating space; and
the intermediate polyurethane layer is cured and cooled.
In a first possible implementation manner of the second aspect, the heating temperature of the reaction kettle is 70 degrees celsius, and the heating time is 1 hour.
In a second possible implementation of the second aspect, the temperature for curing the intermediate polyurethane layer is 80 degrees celsius for 24 hours.
Compared with the prior art, the invention has the advantages that:
according to the invention, the two pieces of double-curved-surface high-curvature organic glass are laminated by pouring the middle polyurethane layer between the two pieces of double-curved-surface high-curvature organic glass and then performing a thermal curing process, and the laminated double-curved-surface high-curvature organic glass has good optics, excellent bonding force and no bubbles.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of the steps of the lamination method of the high-curvature organic glass in the first, second and third embodiments of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In one embodiment of the invention, the intermediate polyurethane layer is weighed according to the weight percentage: 30% of isocyanate, 55% of polyester diol, 13.8% of polyester triol, 0.5% of antioxidant, 0.5% of ultraviolet absorbent and 0.2% of silane coupling agent.
Referring to fig. 1, a schematic flow chart of the steps of a method 1 for laminating a high-curvature organic glass according to an embodiment of the present invention is shown. The large curvature plexiglass lamination method 1 includes the following steps 101-104, wherein:
and 101, selecting two pieces of double-curved-surface high-curvature organic glass. Taking two pieces of hyperboloid high-curvature organic glass to be laminated, then sequentially cleaning the inner and outer surfaces of the two pieces of hyperboloid high-curvature organic glass by using alcohol and deionized water, and wiping the two pieces of hyperboloid high-curvature organic glass clean.
And 102, placing a silicone tube between the two pieces of double-curved-surface large-curvature organic glass. The silicone tube is placed on one circle of the edge of one piece of hyperboloid high-curvature organic glass, the other piece of hyperboloid high-curvature organic glass is covered on the silicone tube, an accommodating space is formed between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and the two pieces of hyperboloid high-curvature organic glass are clamped.
And 103, pouring. And (3) adding the weighed intermediate polyurethane layer into a reaction kettle, heating to fully react, and pouring into an accommodating space. Preferably, the heating temperature of the reaction kettle is set to 70 ℃ and the heating time is set to 1 hour, but the heating temperature is not limited to this.
And 104, solidifying and cooling. And (3) transferring the two pieces of double-curved-surface high-curvature organic glass poured in the step 103 into an oven, setting the heating temperature of the oven, curing the middle polyurethane layer, and then transferring out of the oven to naturally cool the middle polyurethane layer. Preferably, the curing temperature is 80 degrees celsius and the curing time is 24 hours, but not limited thereto.
In the second embodiment of the invention, the intermediate polyurethane layer is weighed according to the weight percentage: 35% of isocyanate, 55% of polyester diol, 8.8% of polyester triol, 0.5% of antioxidant, 0.5% of ultraviolet absorbent and 0.2% of silane coupling agent.
Referring to fig. 1, a schematic flow chart of the steps of a method 1 for laminating a high-curvature organic glass according to two embodiments of the present invention is shown. The large curvature plexiglass lamination method 1 includes the following steps 101-104, wherein:
and 101, selecting two pieces of double-curved-surface high-curvature organic glass. Taking two pieces of hyperboloid high-curvature organic glass to be laminated, then sequentially cleaning the inner and outer surfaces of the two pieces of hyperboloid high-curvature organic glass by using alcohol and deionized water, and wiping the two pieces of hyperboloid high-curvature organic glass clean.
And 102, placing a silicone tube between the two pieces of double-curved-surface large-curvature organic glass. The silicone tube is placed on one circle of the edge of one piece of hyperboloid high-curvature organic glass, the other piece of hyperboloid high-curvature organic glass is covered on the silicone tube, an accommodating space is formed between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and the two pieces of hyperboloid high-curvature organic glass are clamped.
And 103, pouring. And (3) adding the weighed intermediate polyurethane layer into a reaction kettle, heating to fully react, and pouring into an accommodating space. Preferably, the heating temperature of the reaction kettle is set to 70 ℃ and the heating time is set to 1 hour, but the heating temperature is not limited to this.
And 104, solidifying and cooling. And (3) transferring the two pieces of double-curved-surface high-curvature organic glass poured in the step 103 into an oven, setting the heating temperature of the oven, curing the middle polyurethane layer, and then transferring out of the oven to naturally cool the middle polyurethane layer. Preferably, the curing temperature is 80 degrees celsius and the curing time is 24 hours, but not limited thereto.
In the three embodiments of the invention, the intermediate polyurethane layer is weighed according to the weight percentage: 32.5 percent of isocyanate, 55 percent of polyester diol, 11.3 percent of polyester triol, 0.5 percent of antioxidant, 0.5 percent of ultraviolet absorbent and 0.2 percent of silane coupling agent.
Referring to fig. 1, a schematic flow chart of the steps of a lamination method 1 for large-curvature organic glass according to three embodiments of the present invention is shown. The large curvature plexiglass lamination method 1 includes the following steps 101-104, wherein:
and 101, selecting two pieces of double-curved-surface high-curvature organic glass. Taking two pieces of hyperboloid high-curvature organic glass to be laminated, then sequentially cleaning the inner and outer surfaces of the two pieces of hyperboloid high-curvature organic glass by using alcohol and deionized water, and wiping the two pieces of hyperboloid high-curvature organic glass clean.
And 102, placing a silicone tube between the two pieces of double-curved-surface large-curvature organic glass. The silicone tube is placed on one circle of the edge of one piece of hyperboloid high-curvature organic glass, the other piece of hyperboloid high-curvature organic glass is covered on the silicone tube, an accommodating space is formed between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and the two pieces of hyperboloid high-curvature organic glass are clamped.
And 103, pouring. And (3) adding the weighed intermediate polyurethane layer into a reaction kettle, heating to fully react, and pouring into an accommodating space. Preferably, the heating temperature of the reaction kettle is set to 70 ℃ and the heating time is set to 1 hour, but the heating temperature is not limited to this.
And 104, solidifying and cooling. And (3) transferring the two pieces of double-curved-surface high-curvature organic glass poured in the step 103 into an oven, setting the heating temperature of the oven, curing the middle polyurethane layer, and then transferring out of the oven to naturally cool the middle polyurethane layer. Preferably, the curing temperature is 80 degrees celsius and the curing time is 24 hours, but not limited thereto.
The hyperboloid high-curvature organic glass prepared in the above one to three examples is divided into three groups to be tested, and each group of test items comprises the adhesive force (MPa) between two hyperboloid high-curvature organic glasses and the tensile strength (MPa), the elongation at break, the light transmittance and the haze of the cured intermediate polyurethane layer. Wherein the test standard of the adhesive force is ASTM D1002, the test standard of the tensile strength and the elongation at break is ASTM D638, and the test standard of the light transmittance and the haze is GBT 2410.
A first group: the test object is the hyperboloid large-curvature organic glass prepared in one embodiment, and the test results are as follows:
second group: the test object is the hyperboloid large-curvature organic glass prepared in the two examples, and the test results are as follows:
third group: the test object is the hyperboloid large-curvature organic glass prepared in the three embodiments, and the test results are as follows:
by combining the test data of the adhesive force of the first group to the third group, the maximum adhesive force of the prepared hyperboloid high-curvature organic glass can reach 4.3MPa by utilizing the intermediate polyurethane layer and the high-curvature organic glass laminating method 1; the bonding strength of the hyperboloid large-curvature organic glass prepared by laminating by adopting the glue in the prior art, such as acrylic glue, is usually 1.6 MPa; the prepared double-curved-surface large-curvature organic glass is laminated by adopting a TPU film bonding mode in the prior art, and the bonding strength of the prepared double-curved-surface large-curvature organic glass is usually 2.9 MPa.
Therefore, by using the intermediate polyurethane layer and the large-curvature organic glass laminating method 1, the prepared double-curved-surface large-curvature organic glass can obviously improve the bonding force. In addition, by combining the test data of the tensile strength, the elongation at break, the light transmittance and the haze of the first to third groups, it can be further obtained that the mechanical properties of the cured intermediate polyurethane layer prepared by using the intermediate polyurethane layer and the large-curvature organic glass laminating method 1 have excellent tensile strength and elongation at break, good optics and no bubbles.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An intermediate polyurethane layer, characterized in that the intermediate polyurethane layer comprises the following components in percentage by weight:
30-35% of isocyanate;
50-55% of polyester diol;
10-15% of polyester triol;
0.5% of antioxidant;
0.5% of an ultraviolet absorber; and
0.2% of a silane coupling agent.
2. The intermediate polyurethane layer of claim 1, wherein the isocyanate is dicyclohexylmethane-4, 4-diisocyanate.
3. The intermediate polyurethane layer as claimed in claim 1, wherein the polyester diol has a molecular weight of 540-.
4. The intermediate polyurethane layer as claimed in claim 1, wherein the molecular weight of the polyester triol is 300-600.
5. The intermediate polyurethane layer of claim 1, wherein the antioxidant is antioxidant 1010.
6. The intermediate polyurethane layer of claim 1, wherein the ultraviolet absorber is UV-328.
7. The intermediate polyurethane layer of claim 1, wherein the silane coupling agent is a 1170.
8. A laminating method of a high-curvature organic glass is characterized by comprising the following steps:
taking two pieces of hyperboloid high-curvature organic glass to be laminated, and cleaning the surfaces of the two pieces of hyperboloid high-curvature organic glass;
placing a silicone tube on one circle of the edge of one piece of hyperboloid high-curvature organic glass, covering the other piece of hyperboloid high-curvature organic glass on the silicone tube, forming an accommodating space between the two pieces of hyperboloid high-curvature organic glass and the silicone tube, and clamping the two pieces of hyperboloid high-curvature organic glass;
adding the intermediate polyurethane layer as claimed in any one of claims 1 to 7 into a reaction kettle, heating to fully react, and pouring into the accommodating space; and
the intermediate polyurethane layer is cured and cooled.
9. The lamination method of high-curvature organic glass according to claim 8, wherein the heating temperature of the reaction kettle is 70 ℃ and the heating time is 1 hour.
10. The method of laminating high curvature plastic glazing as claimed in claim 8, wherein the temperature of curing the intermediate polyurethane layer is 80 degrees celsius for 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911218941.1A CN110951439A (en) | 2019-12-03 | 2019-12-03 | Laminating method of middle polyurethane layer and high-curvature organic glass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911218941.1A CN110951439A (en) | 2019-12-03 | 2019-12-03 | Laminating method of middle polyurethane layer and high-curvature organic glass |
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| CN110951439A true CN110951439A (en) | 2020-04-03 |
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| CN201911218941.1A Pending CN110951439A (en) | 2019-12-03 | 2019-12-03 | Laminating method of middle polyurethane layer and high-curvature organic glass |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1146539A (en) * | 1966-09-21 | 1969-03-26 | Ici Ltd | Laminated glass |
| GB1214519A (en) * | 1967-06-14 | 1970-12-02 | Ppg Industries Inc | Laminated glass windows |
| US4556600A (en) * | 1979-09-03 | 1985-12-03 | Saint Gobain Vitrage | Laminated glasses using a non-thermoplastic adhesive insert layer |
| CN110358459A (en) * | 2019-08-20 | 2019-10-22 | 万华化学集团股份有限公司 | A kind of dedicated HXDI type polyurethane film of laminated glass and its preparation method and application |
-
2019
- 2019-12-03 CN CN201911218941.1A patent/CN110951439A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1146539A (en) * | 1966-09-21 | 1969-03-26 | Ici Ltd | Laminated glass |
| GB1214519A (en) * | 1967-06-14 | 1970-12-02 | Ppg Industries Inc | Laminated glass windows |
| US4556600A (en) * | 1979-09-03 | 1985-12-03 | Saint Gobain Vitrage | Laminated glasses using a non-thermoplastic adhesive insert layer |
| CN110358459A (en) * | 2019-08-20 | 2019-10-22 | 万华化学集团股份有限公司 | A kind of dedicated HXDI type polyurethane film of laminated glass and its preparation method and application |
Non-Patent Citations (1)
| Title |
|---|
| 刘益军: "《聚氨酯原料及助剂手册》", 30 April 2005, 化学工业出版社 * |
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