Improved air conditioner hose structure with ultrahigh barrier property
By adopting an improved composite barrier layer in the air-conditioning hose, combined with PA66, EVOH and PA6 layers, the problem of poor resistance to R744 refrigerant is solved, ultra-high barrier performance and high temperature durability are achieved, and phase-based Capacity.
Patent Information
- Application Number
- CN202411887085.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-02-14
AI Technical Summary
The existing ultra-high barrier air conditioning hoses have poor resistance to R744 refrigerant, especially in high temperature environments.
Using an improved composite barrier layer, a six-layer structure barrier layer is formed by combining PA66 with EVOH and PA6 layers to improve the tolerance of the hose to R744.
The ultra-high barrier properties of R744 refrigerant are achieved, the durability of the hose in high temperature environments is enhanced, and compatibility with petroleum-based refrigerated oil or synthetic refrigerated oil is maintained.
Smart Images
Figure CN119435842A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of air-conditioning hoses, and in particular relates to an improved air-conditioning hose structure with ultra-high barrier properties. Background Art
[0002] The applicant proposed an ultra-high barrier air conditioning hose structure in another patent application filed on the same day. The air conditioning hose with this structure can flow R290 and other refrigerants with zero ODP and is compatible with petroleum-based refrigeration oil or synthetic refrigeration oil. However, the composite barrier layer of this air conditioning hose structure contains PA6, which is not suitable for contact with the high-pressure R744 refrigerant flowing in the pipe at a temperature of 140°C-150°C.
[0003] After careful research, the applicant discovered that PA66 has high temperature resistance, and using it to replace PA6 to make a new composite barrier layer or improved composite barrier layer can withstand the high temperature environment when R744 is circulated. Therefore, an improved ultra-high barrier air conditioning hose structure was produced. Summary of the invention
[0004] The present invention mainly solves the problem that the previous ultra-high barrier air conditioning hose has poor tolerance to R744, and provides an improved ultra-high barrier air conditioning hose structure. It is well known that EVOH has excellent extremely high gas barrier properties or high barrier properties among the currently known polymer materials, and the improved ultra-high composite barrier layer of the present invention fully utilizes the high barrier properties of EVOH and the high temperature resistance of PA66. Therefore, the improved ultra-high barrier rubber air conditioning hose structure was born.
[0005] An improved ultra-high barrier air conditioning hose structure, comprising an air conditioning hose with a multi-layer structure, wherein the air conditioning hose is composed of a rubber layer 1, an improved composite barrier layer A, a middle rubber layer 8, a reinforcement layer 9 and an outer rubber layer 10 from the inside to the outside;
[0006] Among them, the improved composite barrier layer A is composed of a six-layer structure, which is composed of PA66 layer 2 + adhesive layer 3 + EVOH layer 4 + PA6 layer 5 + EVOH layer 6 + PA6 layer 7 from the inside to the outside, and is co-extruded and bonded in the above order; the following improved composite barrier layers A are the same.
[0007] Among them, the inner rubber layer 1, the middle rubber layer 8 and the outer rubber layer 10 are added with an adhesive containing a meta-methyl methacrylate system adhesive or a maleic anhydride adhesive when mixing the rubber, so as to be bonded to the corresponding PA66 layer 2, PA6 layer 7 and reinforcement layer 9 during vulcanization.
[0008] Preferably, the air conditioning hose is composed of a modified composite barrier layer A, a middle rubber layer 8, a reinforcement layer 9 and an outer rubber layer 10 from the inside to the outside;
[0009] Wherein, the improved composite barrier layer A is the same as the improved composite barrier layer A mentioned above.
[0010] The middle rubber layer 8 and the outer rubber layer 10 are both added with an adhesive containing a meta-methyl methacrylate system or a maleic anhydride-based adhesive during mixing, so as to be bonded to the corresponding PA6 layer and the reinforcing layer during vulcanization.
[0011] Preferably, the air conditioning hose is composed of a modified composite barrier layer A, a middle rubber layer 8 and a reinforcement layer 9 from the inside to the outside;
[0012] Wherein, the improved composite barrier layer A is the same as the improved composite barrier layer A mentioned above.
[0013] The middle rubber layer 8 is added with a m-formaldehyde-white adhesive or a maleic anhydride-based adhesive during mixing so as to be bonded to the corresponding PA6 layer and the reinforcing layer during vulcanization.
[0014] Preferably, the material of the reinforcing layer is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire. When used to manufacture a hose comprising three rubber layers, inner, middle and outer, or for manufacturing a hose comprising two rubber layers, middle and outer, the reinforcing layer can be manufactured by a weaving process or a winding process.
[0015] Preferably, the material of the reinforcing layer is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire. When used to manufacture a hose containing only a middle rubber layer, the reinforcing layer is only allowed to be manufactured by weaving technology, with no other options.
[0016] Preferably, the air conditioning hose has ultra-high anti-permeability when R744 or a refrigerant with an ODP of zero flows through the hose.
[0017] Preferably, the air conditioning hose is compatible with petroleum-based refrigeration oil or synthetic refrigeration oil flowing in the hose. The present invention has the following beneficial effects:
[0018] 1. The present invention is a multi-layered rubber air conditioning hose. Since PA66 is added to the composite barrier layer A, the multi-layered rubber air conditioning hose has an ultra-high barrier performance that can flow R744.
[0019] 2. The rubber air conditioning hose of the present invention has a multi-layer structure, that is, it is soft and bendable, which determines that the rubber air conditioning hose of this structure is easy to be installed on the R744 air conditioning system of the automobile.
[0020] 3. Due to the above-mentioned soft and bendable characteristics, the length of this multi-layer rubber air conditioning hose can be measured on-site when used as indoor and outdoor connecting pipes of household air conditioners. It is easy to install on-site and is particularly suitable for a wide range of installation environments. It is not restricted by factory-made fixed-length production of copper connecting pipes.
[0021] 4. Under the strong demand of the country to protect the environment, the use of improved ultra-high barrier rubber air-conditioning hose has significant cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is a structural schematic diagram of embodiment 1 of the present invention;
[0023] Figure 2 is a structural schematic diagram of embodiment 2 of the present invention;
[0024] Figure 3 It is a structural schematic diagram of embodiment 3 of the present invention.
[0025] In the figure: 1 is the inner rubber layer; 2 is the PA6 layer; 3 is the adhesive layer; 4 is the EVOH layer; 5 is the PA6 layer; 6 is the EVOH layer; 7 is the PA6 layer; 8 is the middle rubber layer; 9 is the reinforcement layer; 10 is the outer rubber layer. DETAILED DESCRIPTION
[0026] Below through embodiment, with attached Figure 1-Figure 3 , the technical solution of the present invention is further specifically described.
[0027] Embodiment 1:
[0028] An improved ultra-high barrier air conditioning hose structure, comprising an air conditioning hose with a multi-layer structure, wherein the air conditioning hose is composed of an inner rubber layer 1, an improved composite barrier layer A, a middle rubber layer 8, a reinforcement layer 9 and an outer rubber layer 10 from inside to outside;
[0029] Among them, the improved composite barrier layer A is composed of a six-layer structure, which is composed of PA66 layer 2 + adhesive layer 3 + EVOH layer 4 + PA6 layer 5 + EVOH layer 6 + PA6 layer 7 from the inside to the outside and is co-extruded and bonded in the above order; the improved composite barrier layer A described below is the same.
[0030] The material of the reinforcing layer is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire. When used in this embodiment, the reinforcing layer can be manufactured by a weaving process or a winding process.
[0031] Among them, the inner rubber layer 1, the middle rubber layer 8 and the outer rubber layer 10 are all added with a methylene blue system adhesive or a maleic anhydride adhesive during mixing, so that they can be bonded with the corresponding PA66 layer 2, PA6 layer 7, and reinforcement layer 9 during vulcanization to form an improved ultra-high barrier air-conditioning hose.
[0032] Embodiment 2:
[0033] This embodiment further defines that the air conditioning hose is composed of a modified composite barrier layer A, a middle rubber layer 8, a reinforcement layer 9 and an outer rubber layer 10 from the inside to the outside on the basis of the embodiment 1;
[0034] Wherein, the improved composite barrier layer A is the same as the improved composite barrier layer A mentioned above.
[0035] The material of the reinforcing layer is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire. When used in this embodiment, the reinforcing layer can be manufactured by a weaving process or a winding process.
[0036] The middle rubber layer 8 and the outer rubber layer 10 are both added with a methylene blue adhesive or a maleic anhydride adhesive during mixing, and are bonded together with the corresponding PA6 layer 7 and the reinforcing layer 9 during vulcanization to form an improved ultra-high barrier air conditioning hose.
[0037] Embodiment 3:
[0038] Based on Example 1, this embodiment does not extrude the inner rubber layer 1 and the outer rubber layer 10 , and its structure from inside to outside is composed of an improved composite barrier layer A, a middle rubber layer 8 , and a reinforcement layer 9 .
[0039] Wherein, the improved composite barrier layer A is the same as the improved composite barrier layer A mentioned above.
[0040] The material of the reinforcing layer 9 is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire, and the reinforcing layer 9 must be manufactured by weaving process. No other options.
[0041] The middle rubber layer 8 is also added with a meta-methyl methacrylate adhesive or a maleic anhydride adhesive, and is bonded to the corresponding PA6 layer 7 and the reinforcing layer 9 during vulcanization to form an improved ultra-high barrier air conditioning hose. The following are the preparations before the process implementation steps.
[0042] 1. Clean the soft core that meets the process requirements, apply the isolation agent, fill the reel with it and place it on the pay-off machine for standby use.
[0043] 2. The rubber layer 1, the rubber layer 8 and the rubber layer 10 to which the adhesive has been added and mixed are placed separately for use.
[0044] 3. Place PA66, adhesive, EVOH, PA6 and TPX into the drying drum of the relevant plastic extruder for drying and standby use.
[0045] 4. Heat the horizontal vulcanizing tank and keep it warm for later use.
[0046] 5. Wrap the yarn that meets the process requirements around the spindle and install it on the knitting machine for use.
[0047] The following are Figure 1 The process implementation steps of the improved structure of ultra-high barrier rubber air-conditioning hose.
[0048] Step 1:
[0049] A soft core wire reel filled with a release agent that meets the process requirements is placed on a wire-laying machine, and the soft core is sent to the T-head of a rubber extruder by a traction machine to extrude an inner rubber layer (1) to form a semi-finished hose. The diameter is measured and controlled by a diameter gauge, and then the outer surface of the inner rubber layer is dried by a water tank after cooling, and then the traction machine advances at a constant line speed.
[0050] Step 2:
[0051] The semi-finished hose coated with the inner rubber layer is sent into the multi-layer co-extrusion die of the plastic extruder unit to extrude a six-layer structure of an ultra-high barrier composite barrier layer (A), and is pulled forward at a constant linear speed by a traction machine, and is subjected to heat setting, water cooling, and blow drying, and then enters the T-type die of the rubber extruder to coat the middle rubber layer (8).
[0052] Step 3:
[0053] The semi-finished hose coated with the middle rubber layer (8) also needs to be measured by a caliper to control the diameter size. After the semi-finished hose is cooled by water, blown dry, and coated with a release agent, it is still wound up at a constant line speed. The reel filled with the semi-finished hose is transferred to the braiding process for coating the reinforcement layer.
[0054] Step 4:
[0055] Place the wire reel at the specified position of the braiding machine, and weave and coat the semi-finished hose according to the braiding yarn type, spindle speed, braiding tension and braiding angle specified in the process. Wind the semi-finished hose coated with the reinforcement layer at a constant line speed, and transfer the full wire reel of the semi-finished braided tube to the outer rubber layer production line.
[0056] Step 5:
[0057] Place the semi-finished hose reel filled with braids on the pay-off machine, and the traction machine will send the semi-finished hose into the T-head of the rubber extruder to be coated with the outer rubber layer (after 10), and the diameter size will still be detected and controlled by the diameter gauge, and then water cooled and blown dry, and then pulled by the traction machine to be sent into the T-head of the plastic extruder at a constant line speed. After the TPX plastic is coated, it is cooled and blown dry, and then reeled by the horizontal winder at a constant line speed. After the reel is full, transfer the reel to the vulcanization process. Step 6:
[0058] Fill the horizontal vulcanizing tank with the hose reel to be vulcanized, and vulcanize it strictly according to the steam pressure, temperature and time specified in the vulcanization process. Then open the tank, take out the matured hose reel and send it to the plastic stripping machine.
[0059] Step 7:
[0060] The hose that has been sent to the plastic stripping machine has the TPX plastic on the outer surface stripped off, and then the hose is transferred to the core stripping machine, where the soft core in the hose hole is removed by high-pressure water to obtain an improved ultra-high barrier air-conditioning hose.
[0061] At this point, the improved ultra-high barrier air conditioning hose has been manufactured. Of course, there are other necessary operations that will not be described here.
[0062] illustrate:
[0063] 1. The reinforcing layer of the improved ultra-high barrier air conditioning hose can also be manufactured by replacing the equipment with a yarn winding process, in which case the hose can be manufactured continuously. There is no process discontinuity problem when using the yarn braiding method.
[0064] 2. After the improved composite ultra-high barrier air conditioning hose is plastic coated, it can also be rewound on the vulcanizing plate with a vertical reel at a constant line speed, and the fully loaded vulcanizing plates are sent to the vertical vulcanizing tank behind the warm tank. After the tank is filled, the vulcanization is carried out in strict accordance with the steam pressure, temperature and time specified in the vulcanization process, and then the tank is opened to take out the matured hose coil and sent to the plastic stripping machine. The following is the same as the horizontal tank treatment and will not be repeated.
[0065] Below is Figure 2 The implementation process steps of the constructed improved ultra-high barrier rubber air-conditioning hose.
[0066] because Figure 2 The structure has no inner rubber layer 1, so Figure 1 The implementation step in the structure is Figure 2 The implementation steps of the construction do not exist. Figure 1 The construction and implementation steps are the same.
[0067] Below is Figure 3 The implementation process steps of constructing an improved ultra-high barrier rubber air-conditioning hose.
[0068] because Figure 3 There is no inner rubber layer and outer rubber layer in the structure, so Figure 1 The rubber extrusion part of the implementation step 1 and the implementation step 5 in the structure does not exist, and the rest is the same as Figure 1 The construction steps are the same, but the covering reinforcement layer is only allowed to be manufactured by weaving process.
[0069] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.
Claims
1. An improved ultra-high barrier air conditioning hose structure, comprising an air conditioning hose with a multi-layer structure, characterized in that The air conditioning hose is composed of an inner rubber layer (1), an improved composite barrier layer A, a middle rubber layer (8), a reinforcement layer (9) and an outer rubber layer (10) from the inside to the outside; The improved composite barrier layer A is composed of a six-layer structure, which is composed of a PA66 layer (2) + an adhesive layer (3) + an EVOH layer (4) + a PA6 layer (5) + an EVOH layer (6) + a PA6 layer (7) from the inside to the outside and is arranged in the above order by co-extrusion and bonding.
2. According to claim 1, the improved ultra-high barrier air conditioning hose structure is characterized in that The air conditioning hose is composed of a modified composite barrier layer A, a middle rubber layer (8), a reinforcement layer (9) and an outer rubber layer (10) from the inside to the outside.
3. The improved ultra-high barrier air conditioning hose structure according to claim 1 is characterized in that The air conditioning hose is composed of an improved composite barrier layer A, a middle rubber layer (8) and a reinforcement layer (9) from the inside to the outside.
4. The improved ultra-high barrier air conditioning hose structure according to claim 3 is characterized in that The material of the reinforcing layer (9) is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire, and the reinforcing layer (9) is only allowed to be manufactured by weaving technology.
5. The improved ultra-high barrier air conditioning hose structure according to claim 1 or 2, characterized in that The material of the reinforcing layer (9) is selected from one of polyester yarn, nylon yarn, rayon yarn, vinylon yarn, glass fiber yarn and metal wire, and the reinforcing layer (9) can be manufactured by a weaving process or a winding process.
6. The improved ultra-high barrier air conditioning hose structure according to any one of claims 1 to 3, characterized in that During mixing, an adhesive containing a meta-methyl white system adhesive or a maleic anhydride adhesive is added to the inner rubber layer (1), the middle rubber layer (8) and the outer rubber layer (10).
7. The improved ultra-high barrier air conditioning hose structure according to any one of claims 1 to 3, characterized in that During the vulcanization process, the inner rubber layer (1), the middle rubber layer (8) and the outer rubber layer (10) are bonded together with the corresponding PA66 layer (2), the PA6 layer (7) and the reinforcing layer (9) to form a tube.
8. The improved ultra-high barrier air conditioning hose structure according to any one of claims 1 to 3, characterized in that This air conditioning hose has super high permeation resistance when R744, R290, R600a, R32, R1234yf, R134a or refrigerant with zero ODP flows through the hose.
9. The improved ultra-high barrier air conditioning hose structure according to any one of claims 1 to 3, characterized in that The air conditioning hose is compatible with petroleum-based refrigeration oil or synthetic refrigeration oil flowing in the hose.