CN110939796A - Composite felt epoxy resin rubber tube and production method thereof - Google Patents
Composite felt epoxy resin rubber tube and production method thereof Download PDFInfo
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- CN110939796A CN110939796A CN201911195598.3A CN201911195598A CN110939796A CN 110939796 A CN110939796 A CN 110939796A CN 201911195598 A CN201911195598 A CN 201911195598A CN 110939796 A CN110939796 A CN 110939796A
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- epoxy resin
- layer
- composite felt
- felt
- axial
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/10—Silicon-containing compounds
- C08K7/12—Asbestos
-
- 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
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Laminated Bodies (AREA)
Abstract
The invention aims to design a composite felt epoxy resin rubber pipe and a production method thereof.A first layer in the wall of the pipe is epoxy resin rubber, a second layer is an axial composite felt, a third layer is epoxy resin rubber, a fourth layer is glass fiber yarn, a fifth layer is epoxy resin rubber, a sixth layer is an axial composite felt, a seventh layer is epoxy resin rubber, the axial composite felt is stretched and wrapped in the pipe wall along the axial direction of the pipe, the glass fiber yarn is wound along the transverse direction of the axial lead of the pipe, and the axial composite felt and the glass fiber yarn are soaked and wrapped by epoxy resin rubber layer by layer to form the pipe wall.
Description
The technical field is as follows:
the invention relates to a pipeline and a production method thereof, in particular to a composite felt epoxy resin rubber pipe which is mainly suitable for laying cables, drainage pipelines and underground pipelines and a production method thereof.
Background art:
at present, most of traditional pipelines are made of metal, plastic or rubber materials, and fiber yarns are also added into the wall of some plastic or rubber pipelines, but the fiber yarns are not distributed uniformly or have few layers, so that the traditional pipelines have the defects of insufficient strength and the like.
The invention content is as follows:
the invention aims to design a composite felt epoxy resin rubber pipe and a production method thereof.A first layer in the wall of the pipe is epoxy resin rubber, a second layer is an axial composite felt, a third layer is epoxy resin rubber, a fourth layer is glass fiber yarn, a fifth layer is epoxy resin rubber, a sixth layer is an axial composite felt, a seventh layer is epoxy resin rubber, the axial composite felt is stretched and wrapped in the pipe wall along the axial direction of the pipe, the glass fiber yarn is wound along the transverse direction of the axial lead of the pipe, and the axial composite felt and the glass fiber yarn are soaked and wrapped by epoxy resin rubber layer by layer to form the pipe wall.
The technical scheme for solving the technical problems of the invention is as follows: it is composed of epoxy resin glue, axial composite felt I, glass fiber reinforced plastic yarn, axial composite felt II, felt roll frame I, fixed seat, core mold, cover mold, motor, wire spool, gear, felt roll frame II, forming mold, pipe inner layer, creel, sol pool, heater I, heater II, heater III, cooler, stretcher I, stretcher II, cutting machine, diphenol propane epoxy resin, acid anhydride, asbestos powder, talcum powder and mica powder, the first layer of the epoxy resin glue pipeline is epoxy resin glue, the second layer is an axial composite felt I, the third layer is epoxy resin glue, the fourth layer is glass fiber reinforced plastic yarn, the fifth layer is epoxy resin glue, the sixth layer is an axial composite felt II, the seventh layer is epoxy resin glue, the axial composite felt I and the axial composite felt II are stretched in the longitudinal direction of the pipeline axial lead in the epoxy resin glue pipeline wall, and the glass fiber reinforced plastic yarn is wound in the transverse direction of the axial lead. The core mould is fixed on a fixed seat, a felt roll stand I is arranged below the axis of the core mould, the core mould is wrapped by an axial composite felt I on the felt roll stand I, a gear and a wire spool are arranged on a cover film, the wire spool rotates by taking the core mould as an axis under the drive of a motor, a sol pool is arranged below the wire spool, a gummy epoxy resin adhesive is arranged in the sol pool, a creel is arranged on the wire spool, one end of a glass fiber reinforced plastic yarn on the creel is wound on the axial composite felt I wrapped on the core mould, the glass fiber reinforced plastic yarn on the creel can be dipped in the gummy epoxy resin adhesive in the sol pool by the rotation of the wire spool, the dipped gummy epoxy resin adhesive is taken by the glass fiber reinforced plastic yarn to the axial composite felt I, the axial composite felt II on the felt roll stand II wraps the inner layer of the pipe on which the glass fiber reinforced plastic yarn is wound from the upper part of the axis of the core mould, and then enters a forming mould, the heater II controls the temperature to be 150 ℃ and the heater III controls the temperature to be 200 ℃, the epoxy resin glue pipeline formed under the extrusion of the forming die is alternately and uninterruptedly stretched by the stretcher I and the stretcher II and continuously enters a cooler and a cutting machine, the core die, the covering film, the wire reel, the forming die, the cooler, the stretcher I, the stretcher II and the cutting machine are arranged on the same axis, the tail end of the core die does not exceed the outlet end of the forming die, under the mutually alternate and uninterruptedly pulling of the stretcher I and the stretcher II, the axial composite felt I, the glass fiber reinforced plastic yarn, the axial composite felt II and the epoxy resin glue are uninterruptedly formed into the epoxy resin glue pipeline through the forming die, and due to the extrusion of the forming die, the viscose epoxy resin glue soaked on the glass fiber reinforced plastic yarn is extruded to the axial composite felt I and the axial composite felt II, and the inner part of the epoxy resin glue pipeline is extruded through the axial composite, The outer wall forms the first layer in the epoxy resin glue pipeline wall and is epoxy resin glue, the second layer is the axial composite felt I, the third layer is epoxy resin glue, the fourth layer is glass steel fiber yarn, the fifth layer is epoxy resin glue, the sixth layer is the axial composite felt II, the seventh layer is epoxy resin glue. The epoxy resin adhesive matrix comprises 95.4 percent of diphenol propane epoxy resin, 0.6 percent of curing agent anhydride and 1.0 percent of asbestos powder, so as to improve the heat resistance; 1.0 percent of talcum powder is added to improve the abrasion resistance and the lubricating property; adding 2.0% of mica powder to increase the insulating property, firstly adding curing agent anhydride into the diphenol propane epoxy resin, uniformly stirring, and then sequentially adding asbestos powder, talcum powder and mica powder, and uniformly stirring.
The invention has the beneficial effects that: the axial composite felt and the glass fiber yarn are wrapped by the epoxy resin glue layer by layer, the pipeline is high in strength and corrosion resistant, the inner surface and the outer surface of the pipeline are smooth, the production process is continuous, and the pipeline pultrusion is facilitated.
Description of the drawings:
the embodiments of the invention will be further explained with reference to the drawings in which:
FIG. 1 is a schematic view of the interior of the wall of an epoxy pipe (1).
Fig. 2 is a sectional view a-a of fig. 1.
FIG. 3 is a schematic diagram of the manufacturing process of the present invention.
FIG. 4 is a composition diagram of the epoxy resin paste (2).
In the figure, 1, an epoxy resin glue pipeline, 2, epoxy resin glue, 3, axial composite felts I, 4, glass fiber reinforced plastic yarns, 5, axial composite felts II, 6, felt roll frames I, 7, a fixed seat, 8, a core mold, 9, a sleeve mold, 10, a motor, 11, a winding disc, 12, a gear, 13, felt roll frames II, 14, a forming mold, 15, an inner pipe layer, 16, a yarn frame, 17, a sol pool, 18, heaters I, 19, a heater II, 20, a heater III, 21, a cooler, 22, a stretcher I, 23, a stretcher II, 24, a cutting machine, 25, diphenol propane epoxy resin, 26, acid anhydride, 27, asbestos powder, 28, talcum powder and 29 mica powder are arranged.
The specific implementation mode is as follows:
in fig. 1 and fig. 2, the first layer of the epoxy resin glue pipeline (1) is epoxy resin glue (2), the second layer is axial composite felt I (3), the third layer is epoxy resin glue (2), the fourth layer is glass fiber reinforced plastic yarn (4), the fifth layer is epoxy resin glue (2), the sixth layer is axial composite felt II (5), and the seventh layer is epoxy resin glue (2), the axial composite felt I (3) and the axial composite felt II (5) are longitudinally stretched in the epoxy resin glue pipeline (1) wall according to the pipeline axial lead, and the glass fiber reinforced plastic yarn (4) is transversely wound according to the axial lead.
In figure 3, a core mould (8) is fixed on a fixed seat (7), a felt roll stand I (6) is arranged below the axis of the core mould (8), an axial composite felt I (3) on the felt roll stand I (6) wraps the core mould (8), a gear (12) and a wire reel (11) are arranged on a covering film (9), the wire reel (11) rotates by taking the core mould (8) as the axis under the drive of a motor (10), a sol pool (17) is arranged below the wire reel (11), colloidal epoxy resin adhesive (2) is arranged in the sol pool (17), a creel (16) is arranged on the wire reel (11), one end of glass fiber reinforced plastic yarn (4) on the creel (16) is wound on the axial composite felt I (3) wrapped on the core mould (8), the wire reel (11) rotates to dip the glass fiber reinforced plastic yarn (4) on the creel (16) in the colloidal epoxy resin adhesive (2) in the sol pool (17), the method comprises the steps that a viscose glue-shaped epoxy resin adhesive (2) soaked in a glass fiber reinforced plastic yarn (4) is brought to an axial composite felt I (3), an axial composite felt II (5) on a felt roll frame II (13) wraps an inner pipe layer (15) wound with the glass fiber reinforced plastic yarn (4) from the upper side of the axis of a core mold (8), then the axial composite felt II enters a forming mold (14), a heater I (18) is arranged on the forming mold (14) and is controlled to be 100 ℃, a heater II (19) is controlled to be 150 ℃, a heater III (20) is controlled to be 200 ℃, an epoxy resin adhesive pipeline (1) formed under the extrusion of the forming mold (14) is alternately and uninterruptedly stretched by a stretcher I (22) and a stretcher II (23) and continuously enters a cooler (21) and a cutting machine (24), the core mold (8), a covering film (9), a winding disc (11), the forming mold (14), the cooler (21), The drawing machine I (22), the drawing machine II (23) and the cutting machine (24) are arranged on the same axis, the tail end of the core mould (8) is not beyond the outlet end of the forming mould (14), under the mutual alternate and uninterrupted pulling of the drawing machine I (22) and the drawing machine II (23), the axial composite felt I (3), the glass fiber reinforced plastic (4), the axial composite felt II (5) and the epoxy resin glue (2) uninterruptedly pass through the forming mould (14) to form an epoxy resin glue pipeline (1), due to the extrusion of the forming mould (14), the viscose-shaped epoxy resin glue (2) soaked on the glass fiber reinforced plastic (4) is extruded to the axial composite felt I (3) and the axial composite felt II (5), the inner wall and the outer wall of the epoxy resin glue pipeline (1) are extruded through the axial composite felt I (3) and the axial composite felt II (5), and the first layer in the wall of the epoxy resin glue pipeline (1) is formed by the epoxy resin glue (2), The second layer is an axial composite felt I (3), the third layer is epoxy resin glue (2), the fourth layer is glass fiber reinforced plastic fiber yarn (4), the fifth layer is epoxy resin glue (2), the sixth layer is an axial composite felt II (5), and the seventh layer is epoxy resin glue (2).
In fig. 4, the components of the epoxy resin adhesive (2) matrix are 95.4% of diphenol propane epoxy resin (25), 0.6% of curing agent adopting anhydride (26) and 1.0% of asbestos powder (27) added to improve heat resistance; 1.0 percent of talcum powder (28) is added to improve the abrasion resistance and the lubricating property; adding 2.0% of mica powder (29) to increase the insulating property, firstly adding curing agent anhydride (26) into diphenol propane epoxy resin (25) and uniformly stirring, and then sequentially adding asbestos powder (27), talcum powder (28) and mica powder (29) and uniformly stirring.
Claims (3)
1. The utility model provides a compound felt epoxy rubber tube and production method thereof, by epoxy glue (2), axial compound felt I (3), glass steel fiber yarn (4), axial compound felt II (5), felt roll frame I (6), fixing base (7), mandrel (8), cover mould (9), motor (10), wire reel (11), gear (12), felt roll frame II (13), moulded die (14), inside pipe layer (15), creel (16), sol pond (17), heater I (18), heater II (19), heater III (20), cooler (2), stretcher I (22), stretcher II (23), cutting machine (24), diphenol propane epoxy (25), acid anhydride (26), asbestos powder (27), talcum powder (28), mica powder (29) are constituteed, characterized by: the first layer of the epoxy resin glue pipeline (1) is epoxy resin glue (2), the second layer is an axial composite felt I (3), the third layer is epoxy resin glue (2), the fourth layer is glass fiber reinforced plastic yarn (4), the fifth layer is epoxy resin glue (2), the sixth layer is an axial composite felt II (5), the seventh layer is epoxy resin glue (2), the axial composite felt I (3) and the axial composite felt II (5) are longitudinally stretched in the wall of the epoxy resin glue pipeline (1) according to the axial lead of the pipeline, and the glass fiber reinforced plastic yarn (4) is transversely wound according to the axial lead.
2. The composite felt epoxy resin hose and the production method thereof as claimed in claim 1, wherein the composite felt epoxy resin hose is characterized in that: the core mould (8) is fixed on the fixed seat (7), the felt roll stand I (6) is arranged below the axis of the core mould (8), the core mould (8) is wrapped by the axial composite felt I (3) on the felt roll stand I (6), the sleeve film (9) is provided with the gear (12) and the wire spool (11), the wire spool (11) rotates by taking the core mould (8) as the axis under the drive of the motor (10), the glue pool (17) is arranged under the wire spool (11), the gummy epoxy resin glue (2) is arranged in the glue pool (17), the wire spool (11) is provided with the creel (16), one end of the glass fiber yarn (4) on the creel (16) is wound on the axial composite felt I (3) wrapped on the core mould (8), the wire spool (11) rotates to dip the glass fiber yarn (4) on the creel (16) in the gummy epoxy resin glue (2) in the glue pool (17), the method comprises the steps that a viscose glue-shaped epoxy resin adhesive (2) soaked in a glass fiber reinforced plastic yarn (4) is brought to an axial composite felt I (3), an axial composite felt II (5) on a felt roll frame II (13) wraps an inner pipe layer (15) wound with the glass fiber reinforced plastic yarn (4) from the upper side of the axis of a core mold (8), then the axial composite felt II enters a forming mold (14), a heater I (18) is arranged on the forming mold (14) and is controlled to be 100 ℃, a heater II (19) is controlled to be 150 ℃, a heater III (20) is controlled to be 200 ℃, an epoxy resin adhesive pipeline (1) formed under the extrusion of the forming mold (14) is alternately and uninterruptedly stretched by a stretcher I (22) and a stretcher II (23) and continuously enters a cooler (21) and a cutting machine (24), the core mold (8), a covering film (9), a winding disc (11), the forming mold (14), the cooler (21), The drawing machine I (22), the drawing machine II (23) and the cutting machine (24) are arranged on the same axis, the tail end of the core mould (8) is not beyond the outlet end of the forming mould (14), under the mutual alternate and uninterrupted pulling of the drawing machine I (22) and the drawing machine II (23), the axial composite felt I (3), the glass fiber reinforced plastic (4), the axial composite felt II (5) and the epoxy resin glue (2) uninterruptedly pass through the forming mould (14) to form an epoxy resin glue pipeline (1), due to the extrusion of the forming mould (14), the viscose-shaped epoxy resin glue (2) soaked on the glass fiber reinforced plastic (4) is extruded to the axial composite felt I (3) and the axial composite felt II (5), the inner wall and the outer wall of the epoxy resin glue pipeline (1) are extruded through the axial composite felt I (3) and the axial composite felt II (5), and the first layer in the wall of the epoxy resin glue pipeline (1) is formed by the epoxy resin glue (2), The second layer is an axial composite felt I (3), the third layer is epoxy resin glue (2), the fourth layer is glass fiber reinforced plastic fiber yarn (4), the fifth layer is epoxy resin glue (2), the sixth layer is an axial composite felt II (5), and the seventh layer is epoxy resin glue (2).
3. The composite felt epoxy resin hose and the production method thereof as claimed in claim 1, wherein the composite felt epoxy resin hose is characterized in that: the epoxy resin adhesive (2) matrix comprises 95.4% of diphenol propane epoxy resin (25), 0.6% of curing agent anhydride (26) and 1.0% of asbestos powder (27) to improve heat resistance; 1.0 percent of talcum powder (28) is added to improve the abrasion resistance and the lubricating property; adding 2.0% of mica powder (29) to increase the insulating property, firstly adding curing agent anhydride (26) into diphenol propane epoxy resin (25) and uniformly stirring, and then sequentially adding asbestos powder (27), talcum powder (28) and mica powder (29) and uniformly stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911195598.3A CN110939796A (en) | 2019-11-21 | 2019-11-21 | Composite felt epoxy resin rubber tube and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911195598.3A CN110939796A (en) | 2019-11-21 | 2019-11-21 | Composite felt epoxy resin rubber tube and production method thereof |
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| Publication Number | Publication Date |
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| CN110939796A true CN110939796A (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911195598.3A Pending CN110939796A (en) | 2019-11-21 | 2019-11-21 | Composite felt epoxy resin rubber tube and production method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122417A (en) * | 1987-09-17 | 1992-06-16 | Toa Nenryo Kogyo Kabushiki Kaisha | Fiber-reinforced composite resin pultrusion products and method of manufacturing the same |
| JPH06201072A (en) * | 1992-12-28 | 1994-07-19 | Asahi Glass Matetsukusu Kk | Fiber-reinforced synthetic resin pipe |
| CN101328993A (en) * | 2007-08-17 | 2008-12-24 | 大连宇星净水设备有限公司 | Glass fiber reinforced plastic pressure pipe and preparing method thereof |
| CN102434727A (en) * | 2011-11-30 | 2012-05-02 | 徐云清 | Glass fiber reinforced plastic finned tube and production method |
| CN102777708A (en) * | 2012-07-25 | 2012-11-14 | 广东宝通玻璃钢有限公司 | Fiber-woven pultrusion pipeline and production method |
| CN103171155A (en) * | 2013-01-23 | 2013-06-26 | 浙江科成电气有限公司 | Manufacturing method of fiber-reinforced epoxy resin composite tubes and equipment |
| CN103557376A (en) * | 2013-11-15 | 2014-02-05 | 广东宝通玻璃钢有限公司 | Continuous large-caliber woven fiber reinforced thermoset pultrusion pipeline and production method |
| CN104405962A (en) * | 2014-11-08 | 2015-03-11 | 湖南潇湘源科技开发有限责任公司 | High-strength glass fiber-reinforced plastic pipeline and production method thereof |
-
2019
- 2019-11-21 CN CN201911195598.3A patent/CN110939796A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122417A (en) * | 1987-09-17 | 1992-06-16 | Toa Nenryo Kogyo Kabushiki Kaisha | Fiber-reinforced composite resin pultrusion products and method of manufacturing the same |
| JPH06201072A (en) * | 1992-12-28 | 1994-07-19 | Asahi Glass Matetsukusu Kk | Fiber-reinforced synthetic resin pipe |
| CN101328993A (en) * | 2007-08-17 | 2008-12-24 | 大连宇星净水设备有限公司 | Glass fiber reinforced plastic pressure pipe and preparing method thereof |
| CN102434727A (en) * | 2011-11-30 | 2012-05-02 | 徐云清 | Glass fiber reinforced plastic finned tube and production method |
| CN102777708A (en) * | 2012-07-25 | 2012-11-14 | 广东宝通玻璃钢有限公司 | Fiber-woven pultrusion pipeline and production method |
| CN103171155A (en) * | 2013-01-23 | 2013-06-26 | 浙江科成电气有限公司 | Manufacturing method of fiber-reinforced epoxy resin composite tubes and equipment |
| CN103557376A (en) * | 2013-11-15 | 2014-02-05 | 广东宝通玻璃钢有限公司 | Continuous large-caliber woven fiber reinforced thermoset pultrusion pipeline and production method |
| CN104405962A (en) * | 2014-11-08 | 2015-03-11 | 湖南潇湘源科技开发有限责任公司 | High-strength glass fiber-reinforced plastic pipeline and production method thereof |
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Application publication date: 20200331 |