CN110724363A - Efficient wear-resistant sensor shell material and preparation method thereof - Google Patents
Efficient wear-resistant sensor shell material and preparation method thereof Download PDFInfo
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- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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Abstract
The invention provides a high-efficiency wear-resistant sensor shell material and a preparation method thereof, and relates to the technical field of sensor processing. The material is prepared from the following raw materials: 18-20 parts of high-density polyvinyl chloride, 20-22 parts of epoxy resin, 14-16 parts of organic silicon resin, 12-15 parts of acetal resin, 4-6 parts of special-grade bauxite powder, 2-3 parts of alumina micro powder, 1-3 parts of aluminum dihydrogen phosphate, 2-3 parts of basalt fiber, 1.8-2.6 parts of dodecyl trimethyl ammonium chloride, 1-3 parts of silicone powder, 3-4 parts of montmorillonite, 2-3 parts of N-lauroyl sarcosine sodium, 2-3 parts of 4-hydroxybenzene sulfonic acid, 1.4-1.6 parts of barium dinonyl naphthalene sulfonate, 2-4 parts of plasticizer, 1-3 parts of antioxidant and 1-2 parts of coupling agent. The invention overcomes the defects of the prior art, effectively improves the wear resistance of the shell material, prolongs the service life of the sensor and improves the economic value of the product.
Description
Technical Field
The invention relates to the technical field of sensor processing, in particular to a high-efficiency wear-resistant sensor shell material and a preparation method thereof.
Background
The sensor is a detection device which can sense the measured information and convert the sensed information into electric signals or other information in required forms according to a certain rule to output, so as to meet the requirements of information transmission, processing, storage, display, record, control and the like.
In order to conveniently carry and use a common sensor, a plastic shell is arranged outside the sensor to protect internal elements, but the sensor has a wide application range, so that friction is inevitably generated on the shell in the use process of the sensor, the shell is damaged even after long-term use, and the use of the internal elements is damaged, so that the improvement of the wear resistance of the sensor shell material is an important research direction at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-efficiency wear-resistant sensor shell material and the preparation method thereof, which can effectively improve the wear-resistant property of the shell material, prolong the service life of the sensor, reduce the use loss and improve the economic value of the product while ensuring the extrusion mechanical property of the shell material.
In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:
the efficient wear-resistant sensor shell material is prepared from the following raw materials in parts by weight: 18-20 parts of high-density polyvinyl chloride, 20-22 parts of epoxy resin, 14-16 parts of organic silicon resin, 12-15 parts of acetal resin, 4-6 parts of special-grade bauxite powder, 2-3 parts of alumina micro powder, 1-3 parts of aluminum dihydrogen phosphate, 2-3 parts of basalt fiber, 1.8-2.6 parts of dodecyl trimethyl ammonium chloride, 1-3 parts of silicone powder, 3-4 parts of montmorillonite, 2-3 parts of N-lauroyl sarcosine sodium, 2-3 parts of 4-hydroxybenzene sulfonic acid, 1.4-1.6 parts of barium dinonyl naphthalene sulfonate, 2-4 parts of plasticizer, 1-3 parts of antioxidant and 1-2 parts of coupling agent.
Preferably, the plasticizer is at least one of di (2-ethylhexyl) phthalate, dioctyl phthalate, di-n-octyl phthalate, butyl benzyl phthalate, di-sec-octyl phthalate, dicyclohexyl phthalate, and dibutyl phthalate.
Preferably, the antioxidant is a mixture of bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, thiodipropionic acid diester and didodecyl alcohol ester in a mass ratio of 3: 2: 1.
Preferably, the coupling agent is a 2: 1 ordered mixture of gamma-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane.
The preparation method of the high-efficiency wear-resistant sensor shell material comprises the following steps:
(1) mixing high-density polyvinyl chloride, organic silicon resin and acetal resin, grinding into powder, adding epoxy resin, and mechanically stirring at high speed in a stirrer to obtain a mixed resin base material for later use;
(2) mixing and calcining the superfine bauxite powder and the montmorillonite at high temperature, cooling, crushing and sieving by a 100-mesh sieve, adding the alumina micro powder, the basalt fiber, the silicone powder and the deionized water into an ultrasonic homogenizer for ultrasonic homogenization, and centrifuging the obtained homogenized liquid at high speed in a centrifuge to obtain a centrifugal precipitate for later use;
(3) adding dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosinate, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate into the mixed resin base material, mixing in a reaction kettle, and stirring at a high temperature of 180 ℃ for 2-3h at a constant speed under the protection of argon gas to obtain a mixed material for later use;
(4) drying the centrifugal precipitate at high temperature, crushing, adding an antioxidant and a coupling agent, mixing uniformly, adding the mixture into the mixture, slowly stirring uniformly at the high temperature of 190 ℃ and 200 ℃, adding a plasticizer, continuously stirring for 2-3h under ultraviolet illumination, taking out, and extruding for molding to obtain the high-efficiency wear-resistant sensor shell material.
Preferably, the powder obtained by mixing and grinding the high-density polyvinyl chloride, the organic silicon resin and the acetal resin in the step (1) needs to pass through a 120-mesh sieve, the rotating speed of the high-speed mechanical stirring is 1200-1400r/min, and the stirring time is 40-60 min.
Preferably, the power of the ultrasonic homogenization in the step (2) is 260-300W, the frequency is 25-30KHz, the homogenization time is 15-20min, the rotation speed of the centrifugation is 3200-3500r/min, and the centrifugation time is 12-15 min.
Preferably, the ultraviolet irradiation wavelength in the step (4) is 320-400 nm.
The invention provides a high-efficiency wear-resistant sensor shell material and a preparation method thereof, and compared with the prior art, the high-efficiency wear-resistant sensor shell material has the advantages that:
(1) according to the invention, high-density polyvinyl chloride, epoxy resin, organic silicon resin and acetal resin are used as main resin base materials, so that the basic mechanical property of the sensor shell can be effectively ensured, and meanwhile, the resin raw materials are mixed with dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosine, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate for high-temperature modification, so that the curing property and efficiency of the material can be effectively improved, the production time is reduced, the cost is saved, and the hardness and stability of the obtained sensor shell material are improved.
(2) The invention adds special-grade bauxite powder, montmorillonite, alumina micropowder, basalt fiber and silicone powder as fillers, and the special-grade bauxite powder and the montmorillonite are calcined in advance to expand, and then the alumina micropowder, the basalt fiber and the silicone powder are mixed for homogenization and centrifugation, so that the fillers are compounded uniformly, and the stability and the wear resistance of the product are improved.
(3) According to the invention, all the substances are mixed and stirred at high temperature in an ultraviolet irradiation environment, the raw materials can be subjected to surface curing phenomenon when being irradiated by ultraviolet light and are melted again in the high-temperature environment, a series of conversion of curing, melting and mixing is realized through stirring, the combination compactness of the raw materials is effectively improved, the stability of the product is enhanced, and the wear resistance of the product is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the efficient wear-resistant sensor shell material is prepared from the following raw materials in parts by weight: 18 parts of high-density polyvinyl chloride, 20 parts of epoxy resin, 14 parts of organic silicon resin, 12 parts of acetal resin, 4 parts of special-grade bauxite powder, 2 parts of alumina micropowder, 1 part of aluminum dihydrogen phosphate, 2 parts of basalt fiber, 1.8 parts of dodecyl trimethyl ammonium chloride, 1 part of silicone powder, 3 parts of montmorillonite, 2 parts of N-lauroyl sarcosine sodium, 2 parts of 4-hydroxybenzene sulfonic acid, 1.4 parts of barium dinonyl naphthalene sulfonate, 2 parts of plasticizer, 1 part of antioxidant and 1 part of coupling agent.
The plasticizer is di (2-ethylhexyl) phthalate; the antioxidant is a mixture of bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, thiodipropionic acid diester and docosanol ester in a mass ratio of 3: 2: 1; the coupling agent is a mixture of gamma-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane in a directive ratio of 2: 1.
The preparation method of the high-efficiency wear-resistant sensor shell material comprises the following steps:
(1) mixing high-density polyvinyl chloride, organic silicon resin and acetal resin, grinding into powder, adding epoxy resin, and mechanically stirring at high speed in a stirrer to obtain a mixed resin base material for later use;
(2) mixing and calcining the superfine bauxite powder and the montmorillonite at high temperature, cooling, crushing and sieving by a 100-mesh sieve, adding the alumina micro powder, the basalt fiber, the silicone powder and the deionized water into an ultrasonic homogenizer for ultrasonic homogenization, and centrifuging the obtained homogenized liquid at high speed in a centrifuge to obtain a centrifugal precipitate for later use;
(3) adding dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosinate, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate into the mixed resin base material, mixing in a reaction kettle, and stirring at a high temperature of 180 ℃ for 2-3h at a constant speed under the protection of argon gas to obtain a mixed material for later use;
(4) drying the centrifugal precipitate at high temperature, crushing, adding an antioxidant and a coupling agent, mixing uniformly, adding the mixture into the mixture, slowly stirring uniformly at the high temperature of 190 ℃ and 200 ℃, adding a plasticizer, continuously stirring for 2-3h under ultraviolet illumination, taking out, and extruding for molding to obtain the high-efficiency wear-resistant sensor shell material.
Wherein, the powder mixed and ground by the high-density polyvinyl chloride, the organic silicon resin and the acetal resin in the step (1) needs to pass through a 120-mesh sieve, the rotating speed of the high-speed mechanical stirring is 1200-1400r/min, and the stirring time is 40-60 min; the power of ultrasonic homogenization in the step (2) is 260-300W, the frequency is 25-30KHz, the homogenization time is 15-20min, the centrifugal rotating speed is 3200-3500r/min, and the centrifugal time is 12-15 min; the ultraviolet irradiation wavelength in the step (4) is 320-400 nm.
Example 2:
the efficient wear-resistant sensor shell material is prepared from the following raw materials in parts by weight: 20 parts of high-density polyvinyl chloride, 22 parts of epoxy resin, 16 parts of organic silicon resin, 15 parts of acetal resin, 6 parts of special-grade bauxite powder, 3 parts of alumina micro powder, 3 parts of aluminum dihydrogen phosphate, 3 parts of basalt fiber, 2.6 parts of dodecyl trimethyl ammonium chloride, 3 parts of silicone powder, 4 parts of montmorillonite, 3 parts of N-lauroyl sarcosine sodium, 3 parts of 4-hydroxybenzene sulfonic acid, 1.6 parts of barium dinonyl naphthalene sulfonate, 4 parts of plasticizer, 3 parts of antioxidant and 2 parts of coupling agent.
The plasticizer is di-sec-octyl phthalate; the antioxidant is a mixture of bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, thiodipropionic acid diester and docosanol ester in a mass ratio of 3: 2: 1; the coupling agent is a mixture of gamma-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane in a directive ratio of 2: 1.
The preparation method of the high-efficiency wear-resistant sensor shell material comprises the following steps:
(1) mixing high-density polyvinyl chloride, organic silicon resin and acetal resin, grinding into powder, adding epoxy resin, and mechanically stirring at high speed in a stirrer to obtain a mixed resin base material for later use;
(2) mixing and calcining the superfine bauxite powder and the montmorillonite at high temperature, cooling, crushing and sieving by a 100-mesh sieve, adding the alumina micro powder, the basalt fiber, the silicone powder and the deionized water into an ultrasonic homogenizer for ultrasonic homogenization, and centrifuging the obtained homogenized liquid at high speed in a centrifuge to obtain a centrifugal precipitate for later use;
(3) adding dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosinate, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate into the mixed resin base material, mixing in a reaction kettle, and stirring at a high temperature of 180 ℃ for 2-3h at a constant speed under the protection of argon gas to obtain a mixed material for later use;
(4) drying the centrifugal precipitate at high temperature, crushing, adding an antioxidant and a coupling agent, mixing uniformly, adding the mixture into the mixture, slowly stirring uniformly at the high temperature of 190 ℃ and 200 ℃, adding a plasticizer, continuously stirring for 2-3h under ultraviolet illumination, taking out, and extruding for molding to obtain the high-efficiency wear-resistant sensor shell material.
Wherein, the powder mixed and ground by the high-density polyvinyl chloride, the organic silicon resin and the acetal resin in the step (1) needs to pass through a 120-mesh sieve, the rotating speed of the high-speed mechanical stirring is 1200-1400r/min, and the stirring time is 40-60 min; the power of ultrasonic homogenization in the step (2) is 260-300W, the frequency is 25-30KHz, the homogenization time is 15-20min, the centrifugal rotating speed is 3200-3500r/min, and the centrifugal time is 12-15 min; the ultraviolet irradiation wavelength in the step (4) is 320-400 nm.
Example 3:
the efficient wear-resistant sensor shell material is prepared from the following raw materials in parts by weight: 19 parts of high-density polyvinyl chloride, 21 parts of epoxy resin, 15 parts of organic silicon resin, 13.5 parts of acetal resin, 5 parts of special-grade bauxite powder, 2.5 parts of alumina micro powder, 2 parts of aluminum dihydrogen phosphate, 2.5 parts of basalt fiber, 2.2 parts of dodecyl trimethyl ammonium chloride, 2 parts of silicone powder, 3.5 parts of montmorillonite, 2.5 parts of N-lauroyl sarcosine sodium, 2.5 parts of 4-hydroxybenzene sulfonic acid, 1.5 parts of barium dinonyl naphthalene sulfonate, 3 parts of plasticizer, 2 parts of antioxidant and 1.5 parts of coupling agent.
The plasticizer is dicyclohexyl phthalate; the antioxidant is a mixture of bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, thiodipropionic acid diester and docosanol ester in a mass ratio of 3: 2: 1; the coupling agent is a mixture of gamma-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane in a directive ratio of 2: 1.
The preparation method of the high-efficiency wear-resistant sensor shell material comprises the following steps:
(1) mixing high-density polyvinyl chloride, organic silicon resin and acetal resin, grinding into powder, adding epoxy resin, and mechanically stirring at high speed in a stirrer to obtain a mixed resin base material for later use;
(2) mixing and calcining the superfine bauxite powder and the montmorillonite at high temperature, cooling, crushing and sieving by a 100-mesh sieve, adding the alumina micro powder, the basalt fiber, the silicone powder and the deionized water into an ultrasonic homogenizer for ultrasonic homogenization, and centrifuging the obtained homogenized liquid at high speed in a centrifuge to obtain a centrifugal precipitate for later use;
(3) adding dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosinate, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate into the mixed resin base material, mixing in a reaction kettle, and stirring at a high temperature of 180 ℃ for 2-3h at a constant speed under the protection of argon gas to obtain a mixed material for later use;
(4) drying the centrifugal precipitate at high temperature, crushing, adding an antioxidant and a coupling agent, mixing uniformly, adding the mixture into the mixture, slowly stirring uniformly at the high temperature of 190 ℃ and 200 ℃, adding a plasticizer, continuously stirring for 2-3h under ultraviolet illumination, taking out, and extruding for molding to obtain the high-efficiency wear-resistant sensor shell material.
Wherein, the powder mixed and ground by the high-density polyvinyl chloride, the organic silicon resin and the acetal resin in the step (1) needs to pass through a 120-mesh sieve, the rotating speed of the high-speed mechanical stirring is 1200-1400r/min, and the stirring time is 40-60 min; the power of ultrasonic homogenization in the step (2) is 260-300W, the frequency is 25-30KHz, the homogenization time is 15-20min, the centrifugal rotating speed is 3200-3500r/min, and the centrifugal time is 12-15 min; the ultraviolet irradiation wavelength in the step (4) is 320-400 nm.
Example 4:
the materials obtained in examples 1 to 3 above were tested for various properties:
(1) selecting the materials obtained in the embodiments 1-3 as an experimental group and the materials of the shells of the common ABS plastic sensors as a control group;
(2) detecting the wear resistance of each group of materials by adopting an Amsler machine, preparing 4 groups of materials into disc-shaped samples with the diameter of 50cm and the thickness of 1cm, selecting a grinding disc with the surface roughness of 0.4um and the hardness of 60HRC, setting the rotating speed of the grinding disc to be 185r/min, grinding for 2 hours and the load to be 30kg, collecting worn-out scraps after grinding, weighing the scraps, and measuring the wear loss (mg) of the samples;
(3) preparing four groups of materials of an experimental group and a control group into samples of 80 multiplied by 10 multiplied by 4mm by an injection molding method, wherein 2 samples are prepared for each group; taking 1 sample of each group, detecting the bending strength (MPa) of the shell sample by adopting an ISO 178 standard test method, setting the bending speed to be 2mm/min, and detecting and recording; taking the rest 1 sample in each group, and detecting the impact strength (KJ/m) of the sample by adopting an ISO 180 (cantilever beam) standard test method2) And detecting and recording.
The above table shows that the sensor shell obtained by the invention has good wear resistance compared with the common ABS shell, and the product of the invention also has excellent mechanical properties.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The efficient wear-resistant sensor shell material is characterized by being prepared from the following raw materials in parts by weight: 18-20 parts of high-density polyvinyl chloride, 20-22 parts of epoxy resin, 14-16 parts of organic silicon resin, 12-15 parts of acetal resin, 4-6 parts of special-grade bauxite powder, 2-3 parts of alumina micro powder, 1-3 parts of aluminum dihydrogen phosphate, 2-3 parts of basalt fiber, 1.8-2.6 parts of dodecyl trimethyl ammonium chloride, 1-3 parts of silicone powder, 3-4 parts of montmorillonite, 2-3 parts of N-lauroyl sarcosine sodium, 2-3 parts of 4-hydroxybenzene sulfonic acid, 1.4-1.6 parts of barium dinonyl naphthalene sulfonate, 2-4 parts of plasticizer, 1-3 parts of antioxidant and 1-2 parts of coupling agent.
2. The high efficiency wear resistant sensor housing material of claim 1, wherein: the plasticizer is at least one of di (2-ethylhexyl) phthalate, dioctyl phthalate, di-n-octyl phthalate, butyl benzyl phthalate, di-sec-octyl phthalate, dicyclohexyl phthalate and dibutyl phthalate.
3. The high efficiency wear resistant sensor housing material of claim 1, wherein: the antioxidant is a mixture of bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, thiodipropionic acid diester and didodecyl alcohol ester in a mass ratio of 3: 2: 1.
4. The high efficiency wear resistant sensor housing material of claim 1, wherein: the coupling agent is a mixture of gamma-methacryloxypropyltrimethoxysilane and vinyltriethoxysilane in a directive ratio of 2: 1.
5. A preparation method of a high-efficiency wear-resistant sensor shell material is characterized by comprising the following steps: the preparation method of the high-efficiency wear-resistant sensor shell material comprises the following steps:
(1) mixing high-density polyvinyl chloride, organic silicon resin and acetal resin, grinding into powder, adding epoxy resin, and mechanically stirring at high speed in a stirrer to obtain a mixed resin base material for later use;
(2) mixing and calcining the superfine bauxite powder and the montmorillonite at high temperature, cooling, crushing and sieving by a 100-mesh sieve, adding the alumina micro powder, the basalt fiber, the silicone powder and the deionized water into an ultrasonic homogenizer for ultrasonic homogenization, and centrifuging the obtained homogenized liquid at high speed in a centrifuge to obtain a centrifugal precipitate for later use;
(3) adding dodecyl trimethyl ammonium chloride, aluminum dihydrogen phosphate, N-sodium lauroyl sarcosinate, 4-hydroxybenzene sulfonic acid and barium dinonyl naphthalene sulfonate into the mixed resin base material, mixing in a reaction kettle, and stirring at a high temperature of 180 ℃ for 2-3h at a constant speed under the protection of argon gas to obtain a mixed material for later use;
(4) drying the centrifugal precipitate at high temperature, crushing, adding an antioxidant and a coupling agent, mixing uniformly, adding the mixture into the mixture, slowly stirring uniformly at the high temperature of 190 ℃ and 200 ℃, adding a plasticizer, continuously stirring for 2-3h under ultraviolet illumination, taking out, and extruding for molding to obtain the high-efficiency wear-resistant sensor shell material.
6. The preparation method of the high-efficiency wear-resistant sensor shell material as claimed in claim 5, wherein the preparation method comprises the following steps: the powder obtained by mixing and grinding the high-density polyvinyl chloride, the organic silicon resin and the acetal resin in the step (1) needs to pass through a 120-mesh sieve, the rotating speed of high-speed mechanical stirring is 1200-1400r/min, and the stirring time is 40-60 min.
7. The preparation method of the high-efficiency wear-resistant sensor shell material as claimed in claim 5, wherein the preparation method comprises the following steps: the power of ultrasonic homogenization in the step (2) is 260-300W, the frequency is 25-30KHz, the homogenization time is 15-20min, the centrifugal rotation speed is 3200-3500r/min, and the centrifugal time is 12-15 min.
8. The preparation method of the high-efficiency wear-resistant sensor shell material as claimed in claim 5, wherein the preparation method comprises the following steps: the ultraviolet irradiation wavelength in the step (4) is 320-400 nm.
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| CN104710768A (en) * | 2013-12-11 | 2015-06-17 | 张国华 | Plastic synthetic composite material |
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