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CN-121989483-A - Production process suitable for R290 refrigerant rubber hose

CN121989483ACN 121989483 ACN121989483 ACN 121989483ACN-121989483-A

Abstract

The invention relates to a production process of a rubber hose suitable for an R290 refrigerant, which comprises the following steps of (S1) extruding an inner rubber layer, (S2) extruding a composite layer outside the inner rubber layer, (S3) continuously extruding a middle rubber layer, (S4) braiding a reinforcing layer, (S5) extruding an outer rubber layer, namely, after the steps are finished, transferring to an outer rubber extruding step, extruding an outer rubber to use synthetic rubber with excellent weather resistance, (S6) marking and pre-vulcanization treatment, namely, filling various required marks in a printing, spraying and other modes during the outer rubber extruding, S7) vulcanizing, namely, vulcanizing the R290 hose, (S8) transferring to a water stripping cloth and plastic stripping step after vulcanizing the rubber hose, then removing cores and performing a constant pressure test, and (S9) finally, checking, packaging and warehousing. The process method can effectively obtain the high-barrier rubber hose suitable for R290 refrigerant, the process is improved in the prior art, and the high-barrier performance of the air conditioner can be better met under the condition of meeting the process cost requirement.

Inventors

  • Request for anonymity
  • Request for anonymity

Assignees

  • 浙江方威胶管科技有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. The production process suitable for the R290 refrigerant rubber hose is characterized by comprising the following steps of: (S1) extruding an inner adhesive layer, namely extruding a layer of inner adhesive layer by taking a core rod as a support; (S2) extruding a composite layer outside the inner adhesive layer, extruding the composite layer by using a three-composite nylon extruder, and making the extrusion caliber size according to actual needs; (S3) continuously extruding a middle adhesive layer; (S4) braiding a reinforcing layer, wherein 1000D/3 impregnated polyester yarns are adopted as a framework material for braiding in order to ensure that the rubber tube has enough working pressure; (S5) extruding an outer rubber layer, namely transferring to an outer rubber extrusion process after the processes are finished, and extruding the outer rubber by using synthetic rubber with excellent weather resistance; (S6) marking and pre-vulcanization treatment, namely filling various required marks by using modes such as printing, spraying and the like during outer glue extrusion, and simultaneously entering a vulcanization process for vulcanization by winding water cloth or plastic coating and the like during outer glue extrusion according to different requirements of customers; (S7) vulcanizing, namely vulcanizing the R290 hose; (S8) transferring the vulcanized rubber tube into a water-splitting cloth and plastic stripping process, removing the core, and performing constant pressure test, wherein the constant pressure is 1.3-7 megapascals, and the constant pressure time is 60 seconds; and (S9) finally, checking, packaging and warehousing.
  2. 2. The process for producing R290 refrigerant rubber hose according to claim 1, wherein in the step (S1), the core rod is made of rubber or PP material, the inner rubber layer is made of EPDM, and the extrusion thickness is 1-1.2mm.
  3. 3. The process for producing a rubber hose for R290 as claimed in claim 1, wherein in the step (S2), the total thickness of the composite layer is 1.98-2.02mm.
  4. 4. The process for producing a rubber hose for R290 as claimed in claim 1, wherein in the step (S2), the composite layer is formed by using PA6 and EV0H with high barrier property as an intermediate layer.
  5. 5. The process for producing R290 refrigerant rubber hose according to claim 1, wherein in the step (S2), a rubber layer is added in the three composite nylon layers for buffering the whole joint when the joint is buckled, and the thickness of the inner rubber layer is 0.9-1.1mm.
  6. 6. The process for producing a rubber hose for R290 as claimed in claim 1, wherein the thickness of the middle rubber layer in the step (S3) is 0.4-0.6mm.
  7. 7. The process for producing R290 refrigerant rubber hose according to claim 1, wherein in the step (S4), the braiding angle is 54 degrees, the braiding machine is 24 or 36 ingots, and the braiding pitch is 26.8-27.2mm depending on the caliber size of the pipe, so as to meet the requirement that the test burst pressure of the final rubber hose should be more than or equal to 12 megapascals.
  8. 8. The process for producing R290 refrigerant rubber hose according to claim 1, wherein in the step (S5), a smooth surface tube is produced, the extrusion material is TPX, the TPX is coated on the outer rubber layer, the next vulcanization step is carried out, and the TPX is peeled and crushed for reuse after vulcanization.
  9. 9. The process for producing a rubber hose for R290 as claimed in claim 1, wherein the thickness of the outer rubber layer extruded in the step (S5) is 1.6-2.0mm.
  10. 10. The process for producing a rubber hose for R290 as claimed in claim 1, wherein in the step (S7), the vulcanization temperature is 162-168 ℃, the pressure is 3-8kg, and the time is 55-60 minutes.

Description

Production process suitable for R290 refrigerant rubber hose Technical Field The invention belongs to the technical field of air conditioner rubber tubes, and particularly relates to a production process suitable for an R290 refrigerant rubber hose. Background R290 is mainly composed of propane, is a natural hydrocarbon refrigerant which can be directly obtained from liquefied gas, and compared with freon which is an artificially synthesized refrigerant, the natural working medium R290 does not contain chlorine atoms in the molecule, so that the ODP value is zero, the ozone layer is not destroyed, and the environmental protection form and standard requirements of the world and the domestic can be met. R290 is one of the R134A refrigerants which is regulated by the China government environmental protection agency and the automobile industry after 2030, and is far more than the refrigerants used by the current household air conditioner in terms of GWP and ODP data indexes, so the prospect is self-evident At present, the R290 series air conditioning unit is used, and the inflammability and the explosiveness of the propane refrigerant are important to pay attention to the safety problem of the R290. The R290 is required to burn and explode, and has two preconditions, namely (a) the burning is required to be carried out by an open flame, and (a) the burning and explosion are required to reach more than ten percent of the concentration in the air. In the related process for producing the high-barrier rubber hose of the R290 air conditioner, no related process is found at present, and therefore, it is necessary to provide a suitable process. Disclosure of Invention The invention aims to provide a production process suitable for R290 refrigerant rubber hoses, so that a high-barrier rubber hose production process can be provided, and the production process is suitable for being installed and used by an R290 air conditioner. In order to achieve the above object, the present invention has the following technical scheme. The production process suitable for the R290 refrigerant rubber hose specifically comprises the following steps: (S1) extruding an inner adhesive layer, namely extruding a layer of inner adhesive layer by taking a core rod as a support; (S2) extruding a composite layer outside the inner adhesive layer, extruding the composite layer by using a three-composite nylon extruder, and making the extrusion caliber size according to actual needs; (S3) continuously extruding a middle adhesive layer; (S4) braiding a reinforcing layer, wherein 1000D/3 impregnated polyester yarns are adopted as a framework material for braiding in order to ensure that the rubber tube has enough working pressure; (S5) extruding an outer rubber layer, namely transferring to an outer rubber extrusion process after the processes are finished, and extruding the outer rubber by using synthetic rubber with excellent weather resistance; (S6) marking and pre-vulcanization treatment, namely filling various required marks by using modes such as printing, spraying and the like during outer glue extrusion, and simultaneously entering a vulcanization process for vulcanization by winding water cloth or plastic coating and the like during outer glue extrusion according to different requirements of customers; (S7) vulcanizing, namely vulcanizing the R290 hose; (S8) transferring the vulcanized rubber tube into a water-splitting cloth and plastic stripping process, removing the core, and performing constant pressure test, wherein the constant pressure is 1.3-7 megapascals, and the constant pressure time is 60 seconds; and (S9) finally, checking, packaging and warehousing. Further, in the step (S1), the core rod is made of rubber or PP material, the inner rubber layer is made of EPDM, and the extrusion thickness is 1-1.2mm. Further, in the step (S2), the total thickness of the composite layer is 1.98-2.02mm. Further, in step (S2), PA6 and EV0H having high barrier property as an intermediate layer are used for both sides of the composite layer. Further, in the step (S2), a rubber layer is added in the three-composite nylon layer, so that the purpose of the rubber layer is to play a role in buffering when the whole joint is buckled and pressed, and the thickness of the inner rubber layer is 0.9-1.1mm. Further, in the step (S3), the thickness of the middle adhesive layer is 0.4-0.6mm. Further, in the step (S4), the braiding angle is 54 degrees, the braiding machine adopts 24 ingots or 36 ingots, and the braiding pitch is 26.8-27.2mm according to the caliber and the size of the pipe, so as to meet the requirement that the test burst pressure of the final rubber pipe is more than or equal to 12 megapascals. Further, in the step (S5), a smooth surface pipe is manufactured, plastic coating extrusion is added to the outer glue, the extrusion material is TPX, the TPX is coated on the outer glue layer, the next vulcanization process is carried out, and the TPX