CN113843930A - Method for preparing spray pipe plugging cover from nylon silk-natural rubber composite material - Google Patents
Method for preparing spray pipe plugging cover from nylon silk-natural rubber composite material Download PDFInfo
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- CN113843930A CN113843930A CN202111112774.XA CN202111112774A CN113843930A CN 113843930 A CN113843930 A CN 113843930A CN 202111112774 A CN202111112774 A CN 202111112774A CN 113843930 A CN113843930 A CN 113843930A
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- spray pipe
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- natural rubber
- nylon silk
- silk
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- 239000007921 spray Substances 0.000 title claims abstract description 74
- 239000004677 Nylon Substances 0.000 title claims abstract description 62
- 229920001778 nylon Polymers 0.000 title claims abstract description 62
- 229920003052 natural elastomer Polymers 0.000 title claims abstract description 49
- 229920001194 natural rubber Polymers 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 239000003292 glue Substances 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 31
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 28
- 238000007723 die pressing method Methods 0.000 claims description 21
- 230000000903 blocking effect Effects 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- 238000007605 air drying Methods 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 12
- 230000001680 brushing effect Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000007598 dipping method Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000004880 explosion Methods 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 description 10
- 238000004321 preservation Methods 0.000 description 8
- 238000005238 degreasing Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000007767 bonding agent Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000012634 fragment Substances 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- 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
-
- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
- B29C2071/0045—Washing using non-reactive liquids
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/748—Machines or parts thereof not otherwise provided for
- B29L2031/749—Motors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a method for preparing a spray pipe plugging cover by using a nylon silk-natural rubber composite material, which specifically comprises the following steps: placing the mold into a vulcanizing machine, preheating the mold, opening the mold, clamping 1-4 layers of pretreated nylon silk between two natural rubbers, placing the natural rubbers at the center of a concave-convex mold, closing the mold, performing mold pressing and heating on the mold after the mold closing is finished, naturally cooling the mold pressing machine, performing product demolding, and performing flash and burr treatment to obtain a spray pipe plugging cover; and finally, carrying out surface treatment on the bonding surface of the spray pipe plugging cover. The nylon silk is treated by using the glue solution prepared from natural rubber and aviation gasoline, and the spray pipe blanking cap bonding surface is carbonized by using concentrated sulfuric acid, so that the explosion pressure of the spray pipe blanking cap is greatly improved.
Description
Technical Field
The invention belongs to the technical field of composite material preparation, and particularly relates to a method for preparing a spray pipe plugging cover from a nylon silk-natural rubber composite material.
Background
The nozzle blanking cover is one of the key parts of the integral solid rocket ramjet engine, plays a role in sealing and preventing moisture when in storage and in preparation for hanging flight, and can quickly establish the pressure of a combustion chamber at the moment of ignition of the engine so as to ensure the normal ignition of the engine. The main function of the nozzle blocking cover determines the pressure bearing capacity of the nozzle blocking cover, if the pressure bearing capacity is too low, the nozzle blocking cover is likely to break during storage and hanging flight, and the engine charge is affected with damp or other damages; in addition, the peak value of the ignition pressure of the engine is reduced due to the excessively low pressure bearing capacity, the ignition time of the engine is prolonged, and ignition failure can be caused in severe cases. If the pressure bearing capacity is too high, the ignition pressure peak value of the engine is higher, the engine charging and the shell structure are damaged, and the engine explosion is caused in severe cases. In addition, the fragments generated when the blocking cover is thrown out can cause damage to the aerial carrier or the formation friend, so that the fragments generated by the blocking cover are required not to damage the fighter plane.
In the integral solid rocket ramjet, the booster and the ramjet are connected in series to work and share one combustion chamber. In order to improve the performance of the ramjet engine and reduce the structural complexity, a booster without a spray pipe is generally adopted, and the booster is characterized in that the diameter of the outlet of the spray pipe is large, the bonding area is small, and the booster can be bonded at the position of the spray pipe only, so that the booster can bear large pressure under smaller design pressure. In addition, in order to ensure the safety of the aerial carrier or the teammate machine, the blocking cover is required to be broken without generating overlarge fragments.
Disclosure of Invention
The invention aims to provide a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which greatly improves the explosion pressure of the plugging cover.
The technical scheme adopted by the invention is that the method for preparing the spray pipe plugging cover by using the nylon silk-natural rubber composite material is implemented according to the following steps:
step 1, placing a mold into a vulcanizing machine, and preheating the mold for 30-60min at 40-80 ℃; opening the mould, clamping 1-4 layers of the pretreated nylon silk between two pieces of natural rubber, placing the nylon silk at the center of a concave-convex mould, and closing the mould;
step 2, after the die assembly is completed, carrying out die pressing heating on the die, then opening the die pressing machine after the die pressing machine is naturally cooled to 100 ℃, taking out the die, carrying out product demolding, and simultaneously carrying out flash and burr treatment to obtain the nozzle plug cover;
and 3, carrying out surface treatment on the bonding surface of the nozzle plug cover.
The present invention is also characterized in that,
in the step 1, the treatment mode of the brocade silk is as follows: washing the silk with clear water for 2-3 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 4-8 hours for 2 times, and standing and air drying; and finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is uniformly stressed, thus obtaining the pretreated nylon silk.
The preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h.
In step 2, the process of mould pressing and heating comprises the following steps: heating at a heating rate of 0.33 ℃/min, simultaneously applying a pressure of 2-4Mpa to the mold, then applying a pressure of 9-11Mpa to the mold when the temperature of the mold rises to 85-102 ℃, preserving heat for 30min, then heating at a heating rate of 1 ℃/min to 145-155 ℃, and preserving heat for 30 min.
In step 3, the method specifically comprises the following steps: cleaning the surface of the spray pipe blanking cap by using industrial acetone, dipping concentrated sulfuric acid with the mass fraction of 98% by using a brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe blanking cap, and standing the spray pipe blanking cap for 3 min; repeating for 3 times; and then washing the nozzle plug cover with water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally uniformly coating the adhesive on the adhesive surface of the nozzle plug cover.
The invention has the beneficial effects that the nylon silk is treated by using the glue solution prepared from natural rubber and aviation gasoline, and the spray pipe blanking cap bonding surface is carbonized by using concentrated sulfuric acid, so that the explosion pressure of the spray pipe blanking cap is greatly improved. The preparation process is simple, the cost is low, and the practicability and the popularization value are wide; the nozzle blocking cover prepared by the preparation method can meet the application requirements of the integral solid rocket ramjet in the aerospace field.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which is implemented according to the following steps:
step 1, starting a flat vulcanizing machine, putting a mold into the vulcanizing machine, and preheating the mold for 30-60min at 40-80 ℃; opening the mould, clamping 1-4 layers of pretreated silk fabric with the diameter of 150 mm-200 mm between two pieces of natural rubber, placing the silk fabric at the center of the concave-convex mould, and closing the mould.
The processing mode of the brocade silk is as follows: washing the silk with clear water for 2-3 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 4-8 hours for 2 times, and standing and air drying; finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk which are close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is stressed uniformly, thus obtaining the pretreated nylon silk;
the preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to fully dissolve the natural rubber to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h;
step 2, after the die assembly is completed, continuing to start a flat vulcanizing machine to carry out die pressing heating on the die, wherein the heating rate is 0.33 ℃/min, simultaneously applying 2-4Mpa pressure to the die, then applying 9-11Mpa pressure to the die when the temperature of the die rises to 85-102 ℃, preserving heat for 30min, then heating to 145-155 ℃ at the heating rate of 1 ℃/min, preserving heat for 30min, then closing a heating power supply, naturally cooling to 100 ℃ along with the die pressing machine, opening the die pressing machine, taking out the die, carrying out product demolding, and simultaneously carrying out flash burr treatment to obtain a nozzle plugging cover;
the nozzle blanking cover is one of the key parts of the integral solid rocket ramjet, and the formed product is used for the nozzle blanking cover, thereby being beneficial to replacing the nozzle aluminum blanking cover, simultaneously being capable of further promoting the development of the nozzle blanking cover and also widening the application of the nylon silk-natural rubber composite material.
Step 3, carrying out surface treatment on the bonding surface of the nozzle plug cover;
the method specifically comprises the following steps: firstly, carrying out degreasing and impurity removal treatment on the surface of the spray pipe plug cover by using industrial acetone, then dipping concentrated sulfuric acid with the mass fraction of 98% by using a small brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe plug cover, and then standing the spray pipe plug cover for 3 min; repeating for 3 times; and then washing the spray pipe blanking cap with a large amount of flowing clear water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally respectively and uniformly coating the bonding agent on the spray pipe blanking cap bonding surface and the spray pipe bonding surface for bonding the spray pipe and the spray pipe blanking cap.
Example 1
The invention relates to a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which is implemented according to the following steps:
step 1, starting a flat vulcanizing machine, putting a mold into the vulcanizing machine, and preheating the mold for 30min at 40 ℃; the mold is opened, 1 layer of pretreated nylon silk with the diameter of 150mm is clamped between two pieces of natural rubber, and the nylon silk is placed in the center of the concave-convex mold, and the mold is closed at the same time.
The processing mode of the brocade silk is as follows: washing the silk with clear water for 2 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 4 hours for 2 times, and standing and air drying; finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk which are close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is stressed uniformly, thus obtaining the pretreated nylon silk;
the preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to fully dissolve the natural rubber to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h;
step 2, after the die assembly is completed, continuing to start a flat vulcanizing machine to carry out die pressing heating on the die, wherein the heating rate is 0.33 ℃/min, simultaneously applying 2MPa of pressure to the die, then applying 9MPa of pressure to the die when the temperature of the die rises to 85 ℃, carrying out heat preservation for 30min, then heating the die to 145 ℃ at the heating rate of 1 ℃/min, carrying out heat preservation for 30min, then closing a heating power supply, naturally cooling the die to 100 ℃ along with the die pressing machine, opening the die pressing machine, taking out the die, carrying out product demolding, and simultaneously carrying out flash burr treatment to obtain a nozzle plugging cover;
step 3, carrying out surface treatment on the bonding surface of the nozzle plug cover;
the method specifically comprises the following steps: firstly, carrying out degreasing and impurity removal treatment on the surface of the spray pipe plug cover by using industrial acetone, then dipping concentrated sulfuric acid with the mass fraction of 98% by using a small brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe plug cover, and then standing the spray pipe plug cover for 3 min; repeating for 3 times; and then washing the spray pipe blanking cap with a large amount of flowing clear water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally uniformly coating a binder on the spray pipe blanking cap bonding surface and the spray pipe bonding surface for bonding the spray pipe and the spray pipe blanking cap.
The nozzle plug cap prepared by the method is bonded with the nozzle, then the nozzle plug cap is cured and molded under the pressure of 160N, and the cured and molded product is subjected to a pressure-bearing failure test. Assembling the product on an airtight device, and filling high-purity N with different pressures into the airtight device2And observing the rupture condition of the nozzle blocking cover from the pressure ranging from 0.15MPa to 0.95 MPa.
Example 2
The invention relates to a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which is implemented according to the following steps:
step 1, starting a flat vulcanizing machine, putting a mold into the vulcanizing machine, and preheating the mold for 40min at 50 ℃; the mold was opened, 2 layers of pretreated polyamide silk with a diameter of 160mm were sandwiched between two pieces of natural rubber, and placed in the center of the male and female molds while closing the molds.
The processing mode of the brocade silk is as follows: washing the silk with clear water for 3 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 5 hours for 2 times, and standing and air drying; finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk which are close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is stressed uniformly, thus obtaining the pretreated nylon silk;
the preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to fully dissolve the natural rubber to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h;
step 2, after the die assembly is completed, continuing to start a flat vulcanizing machine to carry out die pressing heating on the die, wherein the heating rate is 0.33 ℃/min, simultaneously giving the pressure of 2MPa to the die, then giving the pressure of 9MPa to the die when the temperature of the die rises to 90 ℃, carrying out heat preservation for 30min, then heating the temperature to 145 ℃ at the heating rate of 1 ℃/min, carrying out heat preservation for 30min, then closing a heating power supply, naturally cooling the die pressing machine to 100 ℃, opening the die pressing machine, taking out the die, carrying out product demolding, and simultaneously carrying out flash burr treatment to obtain a nozzle plugging cover;
step 3, carrying out surface treatment on the bonding surface of the nozzle plug cover;
the method specifically comprises the following steps: firstly, carrying out degreasing and impurity removal treatment on the surface of the spray pipe plug cover by using industrial acetone, then dipping concentrated sulfuric acid with the mass fraction of 98% by using a small brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe plug cover, and then standing the spray pipe plug cover for 3 min; repeating for 3 times; and then washing the spray pipe blanking cap with a large amount of flowing clear water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally respectively and uniformly coating the bonding agent on the spray pipe blanking cap bonding surface and the spray pipe bonding surface for bonding the spray pipe and the spray pipe blanking cap.
The nozzle cap produced by the method of the invention is bonded to the nozzle and subsequently cured under a pressure of 160NAnd carrying out a pressure-bearing failure test on the cured and molded product. Assembling the product on an airtight device, and filling high-purity N with different pressures into the airtight device2And observing the rupture condition of the nozzle blocking cover from 0.15MPa to 1.7 MPa.
Example 3
The invention relates to a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which is implemented according to the following steps:
step 1, starting a flat vulcanizing machine, putting a mold into the vulcanizing machine, and preheating the mold for 50min at 65 ℃; the mold was opened and 3 layers of pretreated polyamide silk with a diameter of 175mm were sandwiched between two pieces of natural rubber and placed in the center of the male and female molds while closing the molds.
The processing mode of the brocade silk is as follows: washing the silk with clear water for 3 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 7 hours for 2 times, and standing and air drying; finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk which are close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is stressed uniformly, thus obtaining the pretreated nylon silk;
the preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to fully dissolve the natural rubber to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h;
step 2, after the die assembly is completed, continuing to start a flat vulcanizing machine to carry out die pressing heating on the die, wherein the heating rate is 0.33 ℃/min, simultaneously applying 3MPa pressure to the die, then applying 10MPa pressure to the die when the temperature of the die rises to 96 ℃, carrying out heat preservation for 30min, then heating the die to 150 ℃ at the heating rate of 1 ℃/min, carrying out heat preservation for 30min, then closing a heating power supply, naturally cooling the die to 100 ℃ along with the die pressing machine, opening the die pressing machine, taking out the die, carrying out product demolding, and simultaneously carrying out flash burr treatment to obtain a nozzle plugging cover;
step 3, carrying out surface treatment on the bonding surface of the nozzle plug cover;
the method specifically comprises the following steps: firstly, carrying out degreasing and impurity removal treatment on the surface of the spray pipe plug cover by using industrial acetone, then dipping concentrated sulfuric acid with the mass fraction of 98% by using a small brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe plug cover, and then standing the spray pipe plug cover for 3 min; repeating for 3 times; and then washing the spray pipe blanking cap with a large amount of flowing clear water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally respectively and uniformly coating the bonding agent on the spray pipe blanking cap bonding surface and the spray pipe bonding surface for bonding the spray pipe and the spray pipe blanking cap.
The nozzle plug cap prepared by the method is bonded with the nozzle, then the nozzle plug cap is cured and molded under the pressure of 160N, and the cured and molded product is subjected to a pressure-bearing failure test. Assembling the product on an airtight device, and filling high-purity N with different pressures into the airtight device2And observing the rupture condition of the nozzle blocking cover from 0.15MPa to 2.8 MPa.
Example 4
The invention relates to a method for preparing a spray pipe plugging cover from nylon silk-natural rubber composite material, which is implemented according to the following steps:
step 1, starting a flat vulcanizing machine, putting a mold into the vulcanizing machine, and preheating the mold for 60min at 80 ℃; the mold is opened, 4 layers of pretreated nylon silk with the diameter of 200mm are clamped between two pieces of natural rubber, and the nylon silk is placed in the center of the concave-convex mold, and the mold is closed at the same time.
The processing mode of the brocade silk is as follows: washing the silk with clear water for 2 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 8 hours for 2 times, and standing and air drying; finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk which are close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is stressed uniformly, thus obtaining the pretreated nylon silk;
the preparation process of the glue solution comprises the following steps: soaking natural rubber in aviation gasoline, and stirring to fully dissolve the natural rubber to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h;
step 2, after the die assembly is completed, continuing to start a flat vulcanizing machine to carry out die pressing heating on the die, wherein the heating rate is 0.33 ℃/min, simultaneously applying 4MPa pressure to the die, then applying 11MPa pressure to the die when the temperature of the die rises to 102 ℃, carrying out heat preservation for 30min, then heating the die to 155 ℃ at the heating rate of 1 ℃/min, carrying out heat preservation for 30min, then closing a heating power supply, naturally cooling the die to 100 ℃ along with the die pressing machine, opening the die pressing machine, taking out the die, carrying out product demolding, and simultaneously carrying out flash burr treatment to obtain a nozzle plugging cover;
step 3, carrying out surface treatment on the bonding surface of the nozzle plug cover;
the method specifically comprises the following steps: firstly, carrying out degreasing and impurity removal treatment on the surface of the spray pipe plug cover by using industrial acetone, then dipping concentrated sulfuric acid with the mass fraction of 98% by using a small brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe plug cover, and then standing the spray pipe plug cover for 3 min; repeating for 3 times; and then washing the spray pipe blanking cap with a large amount of flowing clear water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally respectively and uniformly coating the bonding agent on the spray pipe blanking cap bonding surface and the spray pipe bonding surface for bonding the spray pipe and the spray pipe blanking cap.
The nozzle plug cap prepared by the method is bonded with the nozzle, then the nozzle plug cap is cured and molded under the pressure of 160N, and the cured and molded product is subjected to a pressure-bearing failure test. Assembling the product on an airtight device, and filling high-purity N with different pressures into the airtight device2And observing the rupture condition of the nozzle blocking cover from 0.15MPa to 3.8 MPa.
The different nylon silk-natural rubber composite materials prepared in the embodiments 1 to 4 of the invention are used for manufacturing the nozzle block cover, and corresponding pressure-bearing failure tests are carried out on the composite materials, the results are shown in table 1, and the table 1 shows that the highest explosion pressure which can be borne by the composite materials is obviously improved along with the increase of the number of the layers of the pretreated nylon silk. Meanwhile, the bonding surface of the spray pipe blanking cap is further treated by concentrated sulfuric acid, so that the bonding force of the spray pipe blanking cap and the composite material on the surface of the spray pipe can be well enhanced, and the pressure-bearing capacity of the spray pipe blanking cap is improved.
TABLE 1 pressure-bearing blasting pressure of the nozzle blanking cap corresponding to the pretreated nylon silk with different layer numbers
| Number of layers | 1 | 2 | 3 | 4 |
| Pressure intensity (Mpa) | 0.95 | 1.7 | 2.8 | 3.8 |
The spray pipe blanking cap prepared by the method has the advantages that the bearing capacity can be greatly improved after the nylon silk is treated by the glue solution prepared from the natural rubber and the aviation gasoline and the adhesive surface of the formed spray pipe blanking cap is carbonized by the concentrated sulfuric acid. When the number of the pretreated nylon silk layers is 4, the prepared spray pipe plugging cover can bear the explosion pressure of 3.8 MPa. This provides a feasible solution for making a nozzle closure with excellent properties.
Claims (5)
1. The method for preparing the spray pipe plugging cover from the nylon silk-natural rubber composite material is characterized by comprising the following steps of:
step 1, placing a mold into a vulcanizing machine, and preheating the mold for 30-60min at 40-80 ℃; opening the mould, clamping 1-4 layers of the pretreated nylon silk between two pieces of natural rubber, placing the nylon silk at the center of a concave-convex mould, and closing the mould;
step 2, after the die assembly is completed, carrying out die pressing heating on the die, then opening the die pressing machine after the die pressing machine is naturally cooled to 100 ℃, taking out the die, carrying out product demolding, and simultaneously carrying out flash and burr treatment to obtain the nozzle plug cover;
and 3, carrying out surface treatment on the bonding surface of the nozzle plug cover.
2. The method for preparing the nozzle blocking cover from the nylon silk-natural rubber composite material according to claim 1, wherein in the step 1, the nylon silk is treated in a way that: washing the silk with clear water for 2-3 minutes, removing impurities, air drying, uniformly coating the glue solution on the silk, coating the glue solution once every 4-8 hours for 2 times, and standing and air drying; and finally, cutting the nylon silk coated with the glue solution, brushing the glue solution on two surfaces of the nylon silk close to each other, and applying pressure by using a pressure block to ensure that the nylon silk is uniformly stressed, thus obtaining the pretreated nylon silk.
3. The method for preparing the nozzle blocking cover from the nylon silk-natural rubber composite material according to claim 2, wherein the glue solution is prepared by the following steps: soaking natural rubber in aviation gasoline, and stirring to obtain a glue solution; the mass ratio of the natural rubber to the aviation gasoline is 1: 7; the soaking time is 48 h.
4. The method for preparing the nozzle blocking cover from the nylon silk-natural rubber composite material according to claim 1, wherein in the step 2, the process of mould pressing and heating comprises the following steps: heating at a heating rate of 0.33 ℃/min, simultaneously applying a pressure of 2-4Mpa to the mold, then applying a pressure of 9-11Mpa to the mold when the temperature of the mold rises to 85-102 ℃, preserving heat for 30min, then heating at a heating rate of 1 ℃/min to 145-155 ℃, and preserving heat for 30 min.
5. The method for preparing the nozzle blocking cover from the nylon silk-natural rubber composite material according to claim 1, wherein in the step 3, the method specifically comprises the following steps: cleaning the surface of the spray pipe blanking cap by using industrial acetone, dipping concentrated sulfuric acid with the mass fraction of 98% by using a brush, uniformly coating the concentrated sulfuric acid on the bonding surface of the spray pipe blanking cap, and standing the spray pipe blanking cap for 3 min; repeating for 3 times; and then washing the nozzle plug cover with water, removing concentrated sulfuric acid on the surface, drying for 1h at the temperature of 60 ℃, and finally uniformly coating the adhesive on the adhesive surface of the nozzle plug cover.
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