WO2020087905A1 - Air conditioner composite hose for conveying new environmentally-friendly refrigerant - Google Patents

Abstract

Disclosed is an air conditioner composite hose for conveying a new environmentally-friendly refrigerant. The hose comprises: an inner fluoroplastic gas barrier layer (1); and at least one enhancement layer (3) arranged on an outer side of the fluoroplastic gas barrier layer (1), and a high-temperature-resistant rubber layer (2) arranged on an outer side of the enhancement layer (3), or at least one high-temperature-resistant rubber layer (2) arranged on an outer side of the fluoroplastic gas barrier layer (1), and an enhancement layer (3) arranged on an outer side of the high-temperature-resistant rubber layer (2). The air conditioner composite hose has a high resistance to refrigerant penetration and effectively prevents the leakage of the refrigerant from the joint between a hose connector and the hose.

Description

Composite air-conditioning hose for conveying new-type environment-friendly refrigerant Technical field

The invention relates to an air-conditioning pipe, in particular to a composite air-conditioning hose for conveying a new type of environmentally friendly refrigerant.

Background technique

At present, fluorohydrocarbons and chlorofluorocarbons and other refrigeration media used in air conditioning and refrigeration systems for automobiles and homes, etc. The working conditions of hoses conveying the media are: temperature -40 ℃ ~ 100 ℃, pressure 0 ~ 3.5MPa, so choose poly The amide (nylon) alloy is the structure of the barrier layer. The existing refrigerant R134a has a high GWP value and will decompose harmful substances. Therefore, R134a has become one of the main controlled substances in the Kigali Amendment of the Montreal Protocol and will be banned from use. Carbon dioxide is a natural refrigerant. It has a GWP of 1 and an ozone coefficient of 0. It has good environmental friendliness. At the same time, it has low toxicity, no flammability, and is cheap. Therefore, the use of carbon dioxide in air conditioning can fundamentally solve refrigeration Agent replacement working fluid.

After using the new refrigerant carbon dioxide, the air conditioning system has undergone tremendous changes, and the working environment of the hose conveying the refrigerant has also undergone tremendous changes. The main performances are as follows: (1) The system pressure is high, and the operating pressure is 0MPa-17MPa ; (2) The system temperature is high, the operating temperature range is -50 ℃ ~ 180 ℃; (3) The leakage is small, the hose leakage is required to be less than 0.3g / year; (4) The hose expansion is low, to avoid refrigerant in There is a pressure drop during the transportation process; (5) It is connected to the inlet and outlet of the compressor and has a complex vibration and pulse environment; (6) The carbon dioxide refrigerant has the characteristics of explosive decompression, and the inside of the hose must not be in direct contact with rubber; ( 7) New types of compressor oil require hoses with excellent media resistance. Existing air conditioning hoses can no longer meet the requirements for the use of new refrigerants, and new structural hoses must be developed.

The Chinese patent application (CN101782169A) discloses a THV fluorine material air-conditioning pipe conveying a new environmentally friendly refrigerant. THV thermoplastic elastomer is used as the barrier layer, but the melting point and softening point of THV are low. When the temperature of the hose reaches 165 ℃ , THV has already flowed and no longer has the function of blocking and shielding the gas, so the THV fluorine material air conditioning tube does not have actual use value; in addition, the use temperature of the rubber CIIR, EPDM and ECO of the THV fluorine material air conditioning tube does not exceed 165 ℃, when the working temperature of the hose reaches 165 ℃, the performance of the rubber will be greatly attenuated, and it has no use value. Therefore, the THV fluorine material air conditioning tube is designed based on the existing R134a system, and does not meet the requirements of the new air conditioning refrigeration system.

The Chinese patent application (CN101706024A) discloses a new type of refrigerant CO2 air conditioning system hose. PA11 is used as the structure of the barrier layer. Due to the characteristics of its molecular structure, PA11 uses a temperature of -40 ℃ ~ 120 ℃. When the carbon dioxide system works normally When the temperature reaches 160 ℃, the shielding layer will be significantly softened and deformed, and the carbon dioxide gas molecules will quickly penetrate into the PA11 layer, resulting in a large leakage rate of the system; in addition, when the system stops working, the pressure in the hose quickly decreases and penetrates into the The carbon dioxide molecules in the barrier layer quickly evaporate, and explosive decompression will occur, causing the hose to rupture. The design can not meet the requirements of high temperature 165 ℃ and pressure 17MPa, can not meet the needs of actual use. Similarly, the Chinese patent application (CN105423008A) discloses R744 air conditioning hose, which uses nylon (PA) -polyvinyl alcohol-nylon three-layer composite method to reduce permeability, but PA cannot be applied to a high temperature environment of 165 ° C.

The Chinese patent application (CN108317343A) discloses the R744 air-conditioning pipe and its connection structure. Stainless steel bellows are used as the barrier layer. Since the R744 air-conditioning pipe is connected to both ends of the compressor inlet and outlet, the vibration and pulse of the environment are more complicated. Under the action of vibration and pulse, stainless steel bellows are prone to fatigue damage or breakage, resulting in a significant reduction in the life of the hose. At the same time, during the vibration process, the metal bellows will generate large noise, affecting the NVH performance. In addition, due to the large space in the trough of the stainless steel bellows, the hose will be lack of glue during the vulcanization process, and the vulcanization pressure is insufficient, resulting in poor high temperature resistance of the rubber protective layer, which cannot meet the requirements for use.

Summary of the invention

The purpose of the present invention is to overcome the above technical deficiencies and provide a high-temperature, high-pressure, low-expansion, low-NVH, and long-life composite air conditioning hose for transporting carbon dioxide, a new environmentally friendly refrigerant, to provide long-term stable operation of the air conditioning system A reliable guarantee.

The purpose of the present invention is achieved by the following technical solutions:

A composite air-conditioning hose for conveying a new type of environmentally friendly refrigerant. The inner layer of the composite air-conditioning hose is a fluoroplastic gas barrier layer.

As a technical solution of the composite air-conditioning hose of the present invention, the composite air-conditioning hose includes an inner fluoroplastic gas barrier layer 1 and at least one reinforcement layer 3 provided outside the fluoroplastic gas barrier layer 1 , And / or the high temperature resistant rubber layer 2 provided outside the reinforcement layer 3; the number of the high temperature resistant rubber layer 2 is n, the number of the reinforcement layer 3 is n or n + 1, n is selected from 0, 1, 2; the high temperature resistant rubber layer 2 and the reinforcement layer 3 are arranged alternately.

Preferably, the composite air conditioning hose is composed of a fluoroplastic gas barrier layer 1 and a reinforcement layer 3 in order from inside to outside; or a fluoroplastic gas barrier layer 1, a reinforcement layer 3 and a high temperature resistant rubber layer 2 in sequence from inside to outside ; Or from inside to outside composed of fluoroplastic gas barrier layer 1, reinforced layer 3, high temperature resistant rubber layer 2 and reinforced layer 3; or from inside to outside by fluoroplastic gas barrier layer 1, reinforced layer 3, high temperature resistant rubber layer 2. Reinforcement layer 3 and high temperature resistant rubber layer 2; or from inside to outside by fluoroplastic gas barrier layer 1, reinforcement layer 3, high temperature resistant rubber layer 2, reinforcement layer 3, high temperature resistant rubber layer 2 and reinforcement layer 3 composition.

As another technical solution of the composite air conditioning hose of the present invention, the composite air conditioning hose includes an inner fluoroplastic gas barrier layer 1 and at least one layer disposed outside the fluoroplastic gas barrier layer 1 is resistant to high temperature The rubber layer 2 is a reinforcing layer 3 provided outside the high temperature resistant rubber layer 2; the number of the reinforcing layer 3 is m, and the number of the high temperature resistant rubber layer 2 is m or m + 1, m is selected from 1, 2; The high temperature resistant rubber layer 2 and the reinforcement layer 3 are arranged alternately.

Preferably, the composite air conditioning hose is composed of a fluoroplastic gas barrier layer 1, a high temperature resistant rubber layer 2 and a reinforcement layer 3 in order from inside to outside; or a fluoroplastic gas barrier layer 1 and a high temperature resistant rubber layer in order from inside to outside 2. The reinforced layer 3 and the high temperature resistant rubber layer 2; or from the inside to the outside of the fluorine plastic gas barrier layer 1, the high temperature resistant rubber layer 2, the reinforced layer 3, the high temperature resistant rubber layer 2 and the reinforced layer 3; or by the inner It is composed of fluoroplastic gas barrier layer 1, high temperature resistant rubber layer 2, reinforcement layer 3, high temperature resistant rubber layer 2, reinforcement layer 3 and high temperature resistant rubber layer 2 in this order.

The inner diameter of the composite air conditioning hose is 3.2mm-10mm; the thickness of the fluoroplastic gas barrier layer is 0.1-2.5mm; and the thickness of the high temperature resistant rubber layer is 0.5-3.0mm.

The fluoroplastic of the fluoroplastic gas barrier layer 1 is selected from PTFE (polytetrafluoroethylene), PEP (polyperfluoroethylene propylene), PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), PDVF One or more of (polyvinylidene fluoride) and ETFE (copolymer of ethylene and tetrafluoroethylene).

The material of the high temperature resistant rubber layer 2 is one or more of HNBR (hydrogenated nitrile rubber) composition, silicone rubber composition, and fluororubber composition.

The HNBR rubber composition contains the following components by weight: HNBR rubber: 100 parts, DCP: 2 to 4 parts, accelerator TAIC: 0.5 to 4 parts, antioxidant 445: 0.5 to 3 parts, carbon black N550: 40 ~ 80 parts, softener: 5-10 parts; wherein the softener is selected from softener TOTM, softener TP-95.

The silicone rubber composition contains the following components by weight: methyl vinyl silicone rubber: 100 parts, methyl hydroxy silicone oil: 5-10 parts, reinforcing agent silica: 30-60 parts, peroxide vulcanization Agent bis-pentasulfurizing agent (2,5-dimethyl-2,5-di (tert-butylperoxy) hexane): 2 to 4 parts.

The fluororubber composition contains the following parts by weight of components: fluororubber: 100 parts, magnesium oxide 150: 3-15 parts, calcium hydroxide: 3-6 parts, peroxide vulcanizing agent DCP: 1.5-4.0 parts , N990: 10-40 copies.

The reinforcing layer 3 is formed by weaving or winding one or more of AR (aramid fiber), PVA (polyvinyl alcohol fiber), and metal wire. The wire diameter of the aramid fiber is 0.25-1.0mm, and the elongation at break is ≤3%; the wire diameter of the polyvinyl alcohol fiber is 0.25-1.0mm, and the elongation at break is ≤3.5%; The wire diameter of the metal wire is 0.25-1.0 mm, and the elongation at break is ≤3%. The metal wire is stainless steel wire or copper-plated steel wire.

The beneficial effects of the invention:

The hose of the present invention has excellent comprehensive performances such as resistance to penetration, resistance to high and low temperatures, resistance to bending, low expansion, resistance to vibration and better pulse absorption, high resistance to penetration of refrigerant, and effective prevention of refrigerant in Leakage of the pipe joint and hose connection. The specific performance is:

The use temperature of the fluoroplastic gas barrier layer is -60 ℃ ～ 230 ℃, which can guarantee the same state under the condition of the use temperature of carbon dioxide refrigerant -50 ℃ ～ 180 ℃, which not only maintains the flexibility, but also the intermolecular force. It can ensure the shielding effect of the barrier layer, ensure low penetration, and avoid the occurrence of explosive decompression.

The high temperature resistant rubber layer can ensure the flexibility of the hose at -50 ℃ ~ 180 ℃, to ensure that the hose has good NVH performance; convenient riveting structure design, to ensure low penetration of the hose itself and the joint of the joint.

The reinforcement layer is made of metal wire, aramid or polyvinyl alcohol fiber with high modulus and small temperature coefficient, to ensure that the hose has a small expansion coefficient at -40 ℃ ~ 180 ℃, and the circumferential and radial stability of the hose is good , Reducing the system pressure drop and avoiding the problem of explosive decompression.

BRIEF DESCRIPTION

1 is a schematic structural view of the composite air conditioning hose of Example 1;

2 is a schematic structural view of a composite air conditioning hose of Example 2;

3 is a schematic structural view of a composite air conditioning hose of Example 3;

4 is a schematic structural view of a composite air conditioning hose of Example 4;

5 is a schematic structural view of a composite air conditioning hose of Example 5;

6 is a schematic structural view of a composite air conditioning hose of Example 6;

7 is a schematic structural view of a composite air conditioning hose of Example 7;

8 is a schematic structural view of a composite air conditioning hose of Example 8;

9 is a schematic structural view of a composite air conditioning hose of Example 9.

detailed description

The technical solution of the present invention will be further described below with reference to specific embodiments.

Example 1

As shown in Figure 1, a composite air-conditioning hose for conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, reinforcement layer 3; wherein, the material of fluoroplastic gas barrier layer is PTFE , The thickness is 1.5mm; the reinforcement layer is woven from stainless steel wire with a wire diameter of 0.3mm and an elongation at break of 3.0%. The inner diameter of the composite air conditioning hose is 4mm, and the outer diameter is 8.2mm.

The test method for the leakage of the hose is: the leak detection adopts a helium detection system, the measurement medium is pure R744, the charge of R744 is 185kg / m ³ , the temperature is 165 ° C, the pressure is 13MPa, the load is maintained, and the mass spectrometer is used R744 test, test once every hour until the leakage rate of the adjacent time interval reaches the steady state (<10% deviation), and record the leakage rate after the steady state.

The leakage of the hose is 3g / year.

Example 2

As shown in Figure 2, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, high temperature resistant rubber layer 2 and reinforcement layer 3; among them, fluoroplastic gas barrier layer The material is PDVF, the thickness is 1mm; the material of the high temperature resistant rubber layer is a fluororubber composition: 100 parts of fluororubber, 10 parts of highly active magnesium oxide 150, 6 parts of calcium hydroxide, 3 parts of peroxide curing agent DCP, 30 N990 carbon black with a thickness of 2.4 mm; the reinforcement layer is formed by winding stainless steel wire with a wire diameter of 0.3 mm and an elongation at break of 2.7%. The inner diameter of the composite air conditioning hose is 6mm, and the outer diameter is 14mm.

The leakage of the hose is 2.5g / year.

Example 3

As shown in Figure 3, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside: fluoroplastic gas barrier layer 1, reinforcement layer 3 and high temperature resistant rubber layer 2; wherein, fluoroplastic gas barrier layer The material is PTFE, the thickness is 1mm; the reinforcement layer is wound by a copper-plated steel wire with a wire diameter of 0.3mm and an elongation at break of 2.5%; the material of the high temperature resistant rubber layer is a fluororubber composition (same as Example 2) , The thickness is 2.9mm. The inner diameter of the composite air conditioning hose is 4mm, and the outer diameter is 13mm.

The leakage of the hose is 2.2g / year.

Example 4

As shown in Fig. 4, a composite air conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first high temperature resistant rubber layer 21, reinforcement layer 3 and second high temperature resistant rubber Layer 22; wherein, the material of the fluoroplastic gas barrier layer is PTFE and the thickness is 0.8mm; the materials of the first and second high temperature resistant rubber layers are hydrogenated nitrile rubber composition: 100 parts HNBR rubber, 2.5 parts DCP, 3.5 1 part of accelerator TAIC, 2.5 parts of anti-aging agent 445, 70 parts of N550 carbon black, 8 parts of softener TP-95, the thickness of the two high temperature resistant rubber layers are 2.2mm; the reinforcement layer has a wire diameter of 0.3mm and elongation at break Braided copper-plated steel wire with a rate of 2.5%. The inner diameter of the composite air conditioning hose is 4mm, and the outer diameter is 15.6mm.

The leakage of the hose is 2.4g / year.

Example 5

As shown in Figure 5, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first reinforcement layer 31, high temperature resistant rubber layer 2 and second reinforcement layer 32 . Among them, the material of the fluoroplastic gas barrier layer is PEP with a thickness of 0.5mm; the high temperature resistant rubber layer is a silicone rubber composition: 100 parts methyl vinyl silicone rubber, 8 parts methyl hydroxy silicone oil, 30 parts white carbon black, 2.5 A double bis five vulcanizing agent with a thickness of 3mm; the first reinforcement layer is woven from aramid fiber with a wire diameter of 0.2mm and an elongation at break of 2.8%; the second reinforcement layer is made of a wire diameter of 0.3mm and a breaking extension A stainless steel wire with a length of 2.8% is wound. The inner diameter of the composite air conditioning hose is 9mm, and the outer diameter of the hose is 16mm.

The leakage of the hose is 3g / year.

Example 6

As shown in Figure 6, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first high temperature resistant rubber layer 21, first reinforcement layer 31, second resistance The high-temperature rubber layer 22 and the second reinforcement layer 32. Among them, the material of the fluoroplastic gas barrier layer is PFA, the thickness is 0.8mm; the material of the two high temperature resistant rubber layers is hydrogenated nitrile rubber composition (same as Example 4), and the thickness of the first high temperature resistant rubber layer is 1.5mm , The thickness of the second high temperature resistant rubber layer is 1.2mm; the first reinforcement layer is woven from polyvinyl alcohol fibers with a wire diameter of 0.2mm and an elongation at break of 3.5%; the second reinforcement layer is made of a wire diameter of 0.3mm, Braided stainless steel wire with elongation at break of 2.5%. The inner diameter of the composite air conditioning hose is 10mm, and the outer diameter of the hose is 19mm.

The leakage of the hose is 3.4g / year.

Example 7

As shown in Figure 7, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first reinforcement layer 31, first high temperature resistant rubber layer 21, second reinforcement Layer 32 and second high temperature resistant rubber layer 22. Among them, the material of the fluoroplastic gas barrier layer is ETFE, the thickness is 0.4mm; the material of the two high temperature resistant rubber layers is a silicone rubber composition (same as Example 5), the thickness of the first high temperature resistant rubber layer is 1.4mm, the first The thickness of the second high temperature resistant rubber layer is 1.4mm; both reinforcement layers are woven from aramid fiber with a wire diameter of 0.2mm and an elongation at break of 2.8%. The inner diameter of the composite air conditioning hose is 8mm, and the outer diameter of the hose is 16mm.

The leakage of the hose is 3g / year.

Example 8

As shown in Fig. 8, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first high temperature resistant rubber layer 21, first reinforcement layer 31, second resistance The high-temperature rubber layer 22, the second reinforcement layer 32, and the third high-temperature rubber layer 23 are provided. Among them, the material of the fluoroplastic gas barrier layer is PTFE with a thickness of 0.5mm; the materials of the three high temperature resistant rubber layers are all hydrogenated nitrile rubber compositions (same as Example 4), and the thicknesses of the three high temperature resistant rubber layers are all 1.6mm; the materials of the two reinforcement layers are made of copper-plated steel wire with a wire diameter of 0.3mm and an elongation at break of 2.4%. The inner diameter of the composite air conditioning hose is 4mm, and the outer diameter of the hose is 19mm.

The leakage of the hose is 1.8g / year.

Example 9

As shown in Figure 9, a composite air-conditioning hose conveying a new type of environmentally friendly refrigerant, from inside to outside, is: fluoroplastic gas barrier layer 1, first reinforcement layer 31, first high temperature resistant rubber layer 21, second reinforcement Layer 32, the second high temperature resistant rubber layer 22 and the third reinforcement layer 32. Among them, the material of the fluoroplastic gas barrier layer is PFA, the thickness is 1mm; the material of the two high temperature resistant rubber layers are hydrogenated nitrile rubber composition (same as Example 4), the thickness of the first high temperature resistant rubber layer is 2.0mm, The thickness of the second high temperature resistant rubber layer is 1.6mm; the first reinforcement layer is woven from polyvinyl alcohol fibers with a wire diameter of 0.4mm and an elongation at break of 3.0%; the second reinforcement layer is made of a wire diameter of 0.3mm and is broken Stainless steel wire with an elongation of 2.5% is woven. The inner diameter of the composite air conditioning hose is 4mm, and the outer diameter of the hose is 16mm.

The leakage of the hose is 2.2g / year.

Claims (10)

1. A composite air conditioning hose for conveying a new type of environmentally friendly refrigerant, characterized in that the inner layer of the composite air conditioning hose is a fluoroplastic gas barrier layer.
2. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to claim 1, characterized in that the composite air-conditioning hose includes an inner layer of fluoroplastic gas barrier layer and at least one layer provided outside the fluoroplastic gas barrier layer A reinforcing layer, and / or a high temperature resistant rubber layer provided outside the reinforcing layer; the number of the high temperature resistant rubber layer is n, the number of the reinforcing layer is n or n + 1, n is selected from 0, 1, 2; The high temperature resistant rubber layer and the reinforcement layer are arranged alternately.
3. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to claim 2, characterized in that the composite air-conditioning hose is composed of a fluoroplastic gas barrier layer and a reinforcement layer in order from inside to outside; or from fluorine in order from inside to outside Plastic gas barrier layer, reinforced layer and high temperature resistant rubber layer; or from inside to outside composed of fluoroplastic gas barrier layer, reinforced layer, high temperature resistant rubber layer and reinforced layer; or from inside to outside composed of fluoroplastic gas barrier layer, The reinforced layer, the high temperature resistant rubber layer, the reinforced layer and the high temperature resistant rubber layer; or from the inside to the outside are composed of a fluoroplastic gas barrier layer, a reinforced layer, a high temperature resistant rubber layer, a reinforced layer, a high temperature resistant rubber layer and a reinforced layer shape.
4. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to claim 1, characterized in that the composite air-conditioning hose includes an inner layer of fluoroplastic gas barrier layer and at least one layer provided outside the fluoroplastic gas barrier layer A high temperature resistant rubber layer, a reinforcing layer provided outside the high temperature resistant rubber layer; the number of the reinforcing layer is m, the number of the high temperature resistant rubber layer is m or m + 1, m is selected from 1, 2 ; The high temperature resistant rubber layer and the reinforcement layer are arranged alternately.
5. The composite air-conditioning hose for conveying a new environmentally friendly refrigerant according to claim 4, characterized in that the composite air-conditioning hose is composed of a fluoroplastic gas barrier layer, a high temperature resistant rubber layer and a reinforcement layer in order from inside to outside; or It is composed of fluoroplastic gas barrier layer, high temperature resistant rubber layer, reinforced layer and high temperature resistant rubber layer in order from inside to outside; or from fluoroplastic gas barrier layer, high temperature resistant rubber layer, reinforced layer, high temperature resistant rubber layer and reinforced Layer; or from inside to outside by fluoroplastic gas barrier layer, high temperature resistant rubber layer, reinforcement layer, high temperature resistant rubber layer, reinforcement layer and high temperature resistant rubber layer.
6. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to any one of claims 1 to 5, wherein the fluoroplastic is one or more of PTFE, PEP, PFA, PDVF, and ETFE.
7. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to any one of claims 2-5, characterized in that the material of the high temperature resistant rubber layer is one or more of HNBR, silicone rubber, fluororubber composition Species.
8. The composite air-conditioning hose for conveying a new environment-friendly refrigerant according to claim 7, characterized in that the HNBR rubber composition contains the following components by weight: HNBR rubber: 100 parts, DCP: 2 to 4 parts, accelerator TAIC: 0.5-4 parts, anti-aging agent 445: 0.5-3 parts, carbon black N550: 40-80 parts, softener: 5-10 parts; wherein, the softener is selected from softener TOTM, softener TP- 95;

   The silicone rubber composition contains the following components by weight: methyl vinyl silicone rubber: 100 parts, methyl hydroxy silicone oil: 5-10 parts, reinforcing agent silica: 30-60 parts, peroxide vulcanization Agent double two five curing agent: 2 to 4 parts;

   The fluororubber composition contains the following parts by weight of components: fluororubber: 100 parts, magnesium oxide 150: 3-15 parts, calcium hydroxide: 3-6 parts, peroxide vulcanizing agent DCP: 1.5-4.0 parts , N990: 10-40 copies.
9. The composite air-conditioning hose for conveying a new environmentally friendly refrigerant according to any one of claims 2-5, characterized in that the reinforcement layer is woven from one or more of aramid fiber, polyvinyl alcohol fiber, metal wire Or entangled.
10. The composite air-conditioning hose for conveying a new environmentally friendly refrigerant according to claim 9, characterized in that the aramid fiber has a wire diameter of 0.25-1.0mm, and an elongation at break ≤ 3%; the polyvinyl alcohol The wire diameter of the fiber is 0.25-1.0mm, and the elongation at break is ≤3.5%; the wire diameter of the metal wire is 0.25-1.0mm, and the elongation at break is ≤3%.

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