Heat-resistant and high-pressure-resistant PVC hose and preparation method thereof

Abstract

The present application relates to the technical field of hose manufacturing, in particular to a PVC hose resistant to heat and high pressure and a preparation method thereof. The PVC resin powder is added as a plastic matrix; the plasticizer DOTP is added to plasticize and soften; the calcium carbonate is added to play a role of reinforcing filling; the carbon black is added to shield ultraviolet rays and dye; the calcium-zinc composite stabilizer is added to prevent the PVC from thermal decomposition; the chlorinated polyethylene is added to provide a rubber phase for the material and increase elasticity; the processing aid ACR resin is added to reduce processing temperature, promote plasticization and improve material toughness; the dicumyl peroxide is added to oxidize and break chains as an initiator; the trimethylolpropane trimethacrylate is added to promote vulcanization and crosslinking; and the triallyl isocyanurate is added to play a crosslinking role. The modified zirconium phosphate is further added, the modified zirconium phosphate loaded with iron ions is added to PVC powder, and the heat and high pressure resistance of the PVC hose is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hose manufacturing, in particular to a PVC hose resistant to heat and high pressure and a preparation method thereof. BACKGROUND

[0002] At present, PPR and XLPE are mainly used for floor heating pipes at home and abroad, and PP and PE materials have the disadvantages of poor weather resistance, poor flexibility, high price, etc., especially in the case of heating, the aging speed is very fast, while the PVC braided hose has good weather resistance, good flexibility, can be bent and laid at will, is convenient for transportation, and is cheap, and can replace the mainstream hot water pipe on the current market.

[0003] The hardness of PVC material is greatly different at different temperatures, and the hardness and mechanical strength rapidly decrease with the increase of temperature, if the PVC product is subjected to external force under high temperature conditions, stretching or compression deformation is easily generated; the hot water of high pressure is easy to pierce the PVC adhesive layer from the braided mesh, therefore, it is necessary to improve the heat resistance of the material, according to the general method, the heat resistance of the material can be improved to a certain extent by using high polymerization degree resin and heat-resistant TOTM plasticizer or improving the hardness of the material, but when the braided mesh density is low, the mesh is wide, and the test of water pressure cannot be passed.

[0004] In order to solve the above problems, improve the heat resistance and pressure resistance of the PVC hose, and prolong the service life of the hose, the present application provides a PVC hose resistant to heat and high pressure and a preparation method thereof. SUMMARY

[0005] The present application aims to provide a PVC hose resistant to heat and high pressure and a preparation method thereof to solve the problems in the background art.

[0006] In order to solve the above technical problems, the present application provides the following technical scheme:

[0007] A preparation method of a PVC hose resistant to heat and high pressure, comprising the following steps:

[0008] Step one: take PVC resin powder, plasticizer, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant, ultraviolet absorber, stearic acid, stir, heat to 110-120 DEG C, get pre-plasticized PVC, cool to 60 DEG C, add processing aid, dicumyl peroxide, trimethylolpropane trimethylacrylate, triallyl isocyanurate, modified zirconium phosphate, stir, discharge, cool, get PVC powder;

[0009] Step two: add the PVC powder into the inner layer extruder, extrude and cool to shape, get PVC inner layer hose, braid polyester thread on the outer wall of the PVC inner layer hose, get semi-finished braided tube;

[0010] Step three: PVC powder is added into the outer layer extruder, and the semi-finished braided tube is passed through the die of the outer layer extruder to be extruded and formed, so as to obtain a PVC hose which is resistant to heat and high pressure.

[0011] Preferably, the PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 60-70 parts of plasticizer, 20-30 parts of calcium carbonate, 0.5-1 part of carbon black, 4-6 parts of calcium-zinc composite stabilizer, 5-8 parts of chlorinated polyethylene, 0.5-1 part of antioxidant, 0.5-1 part of ultraviolet absorber, 1-2 parts of stearic acid, 3-5 parts of processing aid, 0.2-0.5 parts of dicumyl peroxide, 0.4-0.6 parts of trimethylolpropane trimethacrylate, 0.2-0.5 parts of triallyl isocyanurate, and 1-3 parts of modified zirconium phosphate.

[0012] Preferably, the plasticizer is plasticizer DOTP, the antioxidant is antioxidant 264, the ultraviolet absorber is UV-9, and the processing aid is ACR resin.

[0013] Preferably, in step two, the rotating speed of the PVC powder during extrusion is 700-800 rmp, and the temperature is 140-150℃.

[0014] Preferably, in step two, the polyester thread is braided on the outer wall of the PVC inner layer hose, and the density is 20 grids per 100 mm.

[0015] Preferably, in step three, the rotating speed of the PVC powder during extrusion is 500-600 rmp, and the temperature is 160-170℃.

[0016] Preferably, the preparation method of the modified zirconium phosphate comprises the following steps: citric acid and deionized water are stirred uniformly to obtain a citric acid solution; iron sulfate and deionized water are stirred uniformly, and the citric acid solution is added to obtain a mixed solution; zirconium oxychloride octahydrate and deionized water are stirred uniformly, and the phosphoric acid solution is added to the mixed solution; and the mixture is stirred for 10-15 min, and is reacted at 175-180℃ for 22-26 h, and then is washed and filtered to obtain the modified zirconium phosphate.

[0017] Preferably, in step two, the polyester thread is pretreated, and the pretreatment process comprises the following steps: rosin and chloroform are stirred uniformly to obtain an impregnation solution; the polyester thread is immersed in the impregnation solution for 2-3 h, and then is taken out and dried to obtain the treated polyester thread.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] (1) The PVC resin powder is added as a plastic base in the application; the plasticizer DOTP is added to plasticize and soften; the calcium carbonate is added to play a role of reinforcing and filling; the carbon black is added to shield ultraviolet rays and dye; the calcium-zinc composite stabilizer is added to prevent the PVC from thermal decomposition; the chlorinated polyethylene is added to provide a rubber phase for the material and increase elasticity; the antioxidant 264 is added to slow down the aging of the PVC under light and heat conditions; the ultraviolet absorber UV-9 is added to convert the light energy of different wave bands in the ultraviolet rays into heat energy to avoid the photodecomposition of the material; the stearic acid is added to improve the uniformity and flowability of the material, which is beneficial to processing and demolding; the processing aid ACR resin is added to reduce the processing temperature, promote plasticization and improve the toughness of the material; the dicumyl peroxide is added to oxidize and break the chain as an initiator; the trimethylolpropane trimethacrylate is added to promote vulcanization and crosslinking; and the triallyl isocyanurate is added to play a crosslinking role.

[0020] (2) The modified zirconium phosphate is added in the pre-plasticized PVC in the application, and citric acid is added when the zirconium phosphate is prepared. The addition of citric acid can improve the surface properties of zirconium phosphate, enhance the dispersibility of zirconium phosphate particles, and improve the active sites on the surface of zirconium phosphate. Moreover, citric acid can also complex with iron ions, further improving the loading rate of iron ions on zirconium phosphate. The addition of modified zirconium phosphate loaded with iron ions to PVC powder can improve the mechanical properties of PVC hoses and improve the high-pressure resistance.

[0021] The polyester thread is pretreated and immersed in an impregnation solution containing rosin. The rosin contains a large number of carboxyl groups that can react with the carboxyl groups in the PVC powder and calcium carbonate. At the same time, rosin also has a tackifying effect, which can improve the bonding force between the polyester thread and the PVC hose, improve the high-pressure resistance of the PVC hose, and prolong its service life. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0023] The main reagents used in the application are as follows:

[0024] PVC resin powder: PVC resin S-70, provided by Formosa Plastics Corporation; plasticizer: plasticizer DOTP, dioctyl phthalate, provided by Zhenjiang Liancheng; calcium carbonate: particle size: 1-10 μm; carbon black: pigment carbon black MA100, provided by Mitsubishi Chemical Corporation, Japan; calcium-zinc composite stabilizer: provided by Birla; chlorinated polyethylene: type: CPE-135A, provided by Dongguan Hongfu New Material; antioxidant: antioxidant 264, provided by Shandong Shouhua Chemical; ultraviolet absorber: ultraviolet absorber UV-9, provided by Jiangsu Runfeng Synthetic; processing aid: ACR resin, type: PA-20, provided by Japan Zhongyuan Chemical; trimethylolpropane trimethacrylate: type: T106670, provided by Aldrich; triallyl isocyanurate: CAS number: 1025-15-6, provided by Sigma-Aldrich; polyester thread: 1500D polyester thread, type: F10002, provided by Dongguan Haiyuan Textile; rosin, provided by Jinan Changyingda Chemical Co., Ltd.

[0025] Example 1

[0026] Step one: pretreatment of polyester thread:

[0027] Take 20 g of rosin and 200 mL of chloroform, stir until uniform to obtain an impregnating solution; immerse the polyester thread in the impregnating solution for 1.5 h, take it out and dry to obtain the treated polyester thread, the bath ratio of the polyester thread to the impregnating solution is 1:15;

[0028] Step two: preparation of a heat-resistant and high-pressure-resistant PVC hose:

[0029] Put the PVC resin powder, plasticizer DOTP, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant 264, ultraviolet absorber, and stearic acid into a mixing kettle and stir at a speed of 800 rmp, heat to 120℃ by friction, and disperse the raw materials with each other to obtain pre-plasticized PVC; when the pre-plasticized PVC cools to 60℃, add the processing aid ACR resin, dicumyl peroxide, trimethylolpropane trimethacrylate, and triallyl isocyanurate, and stir at a speed of 150 rmp for 5 minutes, discharge and cool to obtain PVC powder;

[0030] Put the PVC powder into the inner layer extruder, extrude and cool to shape at a speed of 800 rmp and a plasticizing temperature of 150℃ to obtain a PVC inner layer hose, and weave the treated polyester thread uniformly on the outer wall of the PVC inner layer hose at a density of 20 meshes / 100 mm to obtain a semi-finished woven tube;

[0031] Put the PVC powder into the outer layer extruder, pass the semi-finished woven tube through the die of the outer layer extruder, extrude and shape at a speed of 600 rmp and a plasticizing temperature of 170℃ to obtain a heat-resistant and high-pressure-resistant PVC hose.

[0032] The PVC powder comprises the following ingredients by weight: 100 parts of PVC resin powder, 70 parts of plasticizer DOTP, 30 parts of calcium carbonate, 1 part of carbon black, 6 parts of calcium-zinc composite stabilizer, 8 parts of chlorinated polyethylene, 1 part of antioxidant 264, 1 part of ultraviolet absorber, 2 parts of stearic acid, 5 parts of processing aid ACR resin, 0.5 parts of dicumyl peroxide, 0.6 parts of trimethylolpropane trimethyl acrylate, and 0.5 parts of triallyl isocyanurate.

[0033] Example 2

[0034] Step one: pretreatment of polyester thread

[0035] Take 20g of rosin, 200mL of chloroform, and stir until uniform to obtain an impregnation solution; immerse the polyester thread in the impregnation solution for 2h, remove and dry to obtain the treated polyester thread, with a bath ratio of polyester thread to impregnation solution of 1:15;

[0036] Step two: preparation of modified zirconium phosphate

[0037] Take 2g of citric acid and 10mL of deionized water, and stir until uniform to obtain a citric acid solution; take 0.1g of ferric sulfate and 10mL of deionized water, stir until uniform, add the citric acid solution, and stir for 10min to obtain a mixed solution; take 6g of zirconium oxychloride octahydrate and 20mL of deionized water, stir until uniform, add 66mL of phosphoric acid solution with a concentration of 4mol / L, add the mixed solution, stir for 10min, and react at 175℃ for 22h, then wash and filter to obtain the modified zirconium phosphate;

[0038] Step three: preparation of a heat-resistant and high-pressure-resistant PVC hose

[0039] Add the PVC resin powder, plasticizer DOTP, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant 264, ultraviolet absorber, and stearic acid into a mixing kettle and stir at a rotation speed of 800rmp, and heat to 110℃ by friction to disperse the raw materials from each other to obtain pre-plasticized PVC; when the pre-plasticized PVC cools to 60℃, add the processing aid ACR resin, dicumyl peroxide, trimethylolpropane trimethyl acrylate, triallyl isocyanurate, and modified zirconium phosphate, and stir at a rotation speed of 100rmp for 5min, then discharge and cool to obtain the PVC powder;

[0040] Add the PVC powder into the inner layer extruder, extrude and cool to shape at a rotation speed of 700rmp and a plasticizing temperature of 140℃ to obtain a PVC inner layer hose; uniformly weave the treated polyester thread on the outer wall of the PVC inner layer hose at a density of 20g / 100mm to obtain a semi-finished woven tube;

[0041] The PVC powder is added into the outer layer extruder, the semi-finished braided tube is extruded and formed by passing through the die of the outer layer extruder at the rotating speed of 500 rpm and the plasticizing temperature of 160℃, and a heat-resistant and high-pressure PVC hose is obtained.

[0042] The PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 60 parts of plasticizer DOTP, 20 parts of calcium carbonate, 0.5 parts of carbon black, 4 parts of calcium-zinc composite stabilizer, 5 parts of chlorinated polyethylene, 0.5 parts of antioxidant 264, 0.5 parts of ultraviolet absorber, 1 part of stearic acid, 3 parts of processing aid ACR resin, 0.2 parts of dicumyl peroxide, 0.4 parts of trimethylolpropane trimethacrylate, 0.2 parts of triallyl isocyanurate, and 1 part of modified zirconium phosphate.

[0043] Example 3

[0044] Step one: pretreatment of polyester thread

[0045] 20g of rosin and 200mL of chloroform are stirred uniformly to obtain an impregnation solution; the polyester thread is immersed in the impregnation solution for 2.5h, taken out and dried to obtain the treated polyester thread, and the bath ratio of the polyester thread to the impregnation solution is 1:15;

[0046] Step two: preparation of modified zirconium phosphate

[0047] 2g of citric acid and 10mL of deionized water are stirred uniformly to obtain a citric acid solution; 0.1g of ferric sulfate and 10mL of deionized water are stirred uniformly, added to the citric acid solution, and stirred for 12min to obtain a mixed solution; 6g of zirconium oxychloride octahydrate and 20mL of deionized water are stirred uniformly, 66mL of phosphoric acid solution with a concentration of 4mol / L is added, the mixed solution is added, stirred for 12min, and reacted at 178℃ for 24h; after washing and filtering, the modified zirconium phosphate is obtained;

[0048] Step three: preparation of a heat-resistant and high-pressure PVC hose

[0049] The PVC resin powder, the plasticizer DOTP, the calcium carbonate, the carbon black, the calcium-zinc composite stabilizer, the chlorinated polyethylene, the antioxidant 264, the ultraviolet absorber, and the stearic acid are added into a mixing kettle and stirred at a rotating speed of 800rpm, the temperature is raised to 115℃ by friction, and the raw materials are dispersed with each other to obtain pre-plasticized PVC; when the pre-plasticized PVC is cooled to 60℃, the processing aid ACR resin, the dicumyl peroxide, the trimethylolpropane trimethacrylate, the triallyl isocyanurate, and the modified zirconium phosphate are added, stirred at a rotating speed of 140rpm for 5min, discharged, and cooled to obtain the PVC powder;

[0050] The PVC powder is added into the inner layer extruder, and the PVC inner layer hose is obtained by extrusion and cooling at a rotating speed of 750 rpm and a plasticizing temperature of 145 DEG C. The treated polyester thread is evenly woven on the outer wall of the PVC inner layer hose with a density of 20 grids per 100 mm to obtain a semi-finished woven tube.

[0051] The PVC powder is added into the outer layer extruder, and the semi-finished woven tube is extruded and formed by passing through the die of the outer layer extruder at a rotating speed of 550 rpm and a plasticizing temperature of 165 DEG C to obtain a heat-resistant and high-pressure PVC hose.

[0052] The PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 65 parts of plasticizer DOTP, 25 parts of calcium carbonate, 0.6 parts of carbon black, 5 parts of calcium-zinc composite stabilizer, 6 parts of chlorinated polyethylene, 0.7 parts of antioxidant 264, 0.7 parts of ultraviolet absorber, 1.5 parts of stearic acid, 4 parts of processing aid ACR resin, 0.3 parts of dicumyl peroxide, 0.5 parts of trimethylolpropane trimethyl acrylate, 0.3 parts of triallyl isocyanurate, and 2 parts of modified zirconium phosphate.

[0053] Example 4

[0054] Step one: pretreatment of polyester thread:

[0055] 20 g of rosin and 200 mL of chloroform are stirred uniformly to obtain an impregnation solution; the polyester thread is immersed in the impregnation solution for 3 h, taken out and dried to obtain treated polyester thread, and the bath ratio of the polyester thread to the impregnation solution is 1:15;

[0056] Step two: preparation of modified zirconium phosphate:

[0057] 2 g of citric acid and 10 mL of deionized water are stirred uniformly to obtain a citric acid solution; 0.1 g of ferric sulfate and 10 mL of deionized water are stirred uniformly, and the citric acid solution is added and stirred for 15 min to obtain a mixed solution; 6 g of zirconium oxychloride octahydrate and 20 mL of deionized water are stirred uniformly, 66 mL of phosphoric acid solution with a concentration of 4 mol / L is added, the mixed solution is added, and stirring is performed for 15 min, and the reaction is performed at 180 DEG C for 26 h, and the modified zirconium phosphate is obtained by washing and filtering;

[0058] Step three: preparation of a heat-resistant and high-pressure PVC hose:

[0059] PVC resin powder, plasticizer DOTP, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant 264, ultraviolet absorber, stearic acid are added into a mixing kettle and stirred at a speed of 800 rmp, and the temperature is raised to 120℃ by friction to disperse the raw materials with each other to obtain pre-plasticized PVC. When the pre-plasticized PVC is cooled to 60℃, processing aid ACR resin, dicumyl peroxide, trimethylolpropane trimethyl acrylate, triallyl isocyanurate, modified zirconium phosphate are added and stirred at a speed of 150 rmp for 5 minutes, and then the mixture is discharged and cooled to obtain PVC powder;

[0060] The PVC powder is added into an inner layer extruder and extruded at a speed of 800 rmp and a plasticizing temperature of 150℃, and then cooled to form a PVC inner layer hose. The treated polyester thread is uniformly woven on the outer wall of the PVC inner layer hose at a density of 20 grids per 100 mm to obtain a semi-finished woven tube.

[0061] The PVC powder is added into an outer layer extruder, and the semi-finished woven tube is extruded and formed by passing through the die of the outer layer extruder at a speed of 600 rmp and a plasticizing temperature of 170℃ to obtain a heat-resistant and high-pressure PVC hose.

[0062] The PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 70 parts of plasticizer DOTP, 30 parts of calcium carbonate, 1 part of carbon black, 6 parts of calcium-zinc composite stabilizer, 8 parts of chlorinated polyethylene, 1 part of antioxidant 264, 1 part of ultraviolet absorber, 2 parts of stearic acid, 5 parts of processing aid ACR resin, 0.5 parts of dicumyl peroxide, 0.6 parts of trimethylolpropane trimethyl acrylate, 0.5 parts of triallyl isocyanurate, and 3 parts of modified zirconium phosphate.

[0063] Example 5: The polyester thread is not pretreated, and the rest is the same as in Example 2.

[0064] Step one: preparation of modified zirconium phosphate:

[0065] 2g of citric acid and 10mL of deionized water are stirred uniformly to obtain a citric acid solution. 0.1g of ferric sulfate and 10mL of deionized water are stirred uniformly, and the citric acid solution is added and stirred for 10min to obtain a mixed solution. 6g of zirconium oxychloride octahydrate and 20mL of deionized water are stirred uniformly, 66mL of phosphoric acid solution with a concentration of 4mol / L is added, the mixed solution is added, stirred for 10min, and then reacted at 175℃ for 22h. After washing and filtering, the modified zirconium phosphate is obtained.

[0066] Step two: preparation of a heat-resistant and high-pressure PVC hose:

[0067] PVC resin powder, plasticizer DOTP, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant 264, ultraviolet absorber, stearic acid are added into a mixing kettle and stirred at a speed of 800 rpm, and the temperature is raised to 110°C by friction to disperse the raw materials with each other to obtain pre-plasticized PVC. When the pre-plasticized PVC is cooled to 60°C, processing aid ACR resin, dicumyl peroxide, trimethylolpropane trimethylacrylate, triallyl isocyanurate, modified zirconium phosphate are added and stirred at a speed of 100 rpm for 5 minutes, and then the mixture is discharged and cooled to obtain PVC powder;

[0068] The PVC powder is added into an inner layer extruder and extruded and cooled to form at a speed of 700 rpm and a plasticizing temperature of 140°C to obtain a PVC inner layer hose. The polyester thread without pretreatment is uniformly woven on the outer wall of the PVC inner layer hose at a density of 20 meshes per 100 mm to obtain a semi-finished woven tube.

[0069] The PVC powder is added into an outer layer extruder, and the semi-finished woven tube is extruded and formed through the die of the outer layer extruder at a speed of 500 rpm and a plasticizing temperature of 160°C to obtain a PVC hose resistant to heat and high pressure.

[0070] The PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 60 parts of plasticizer DOTP, 20 parts of calcium carbonate, 0.5 parts of carbon black, 4 parts of calcium-zinc composite stabilizer, 5 parts of chlorinated polyethylene, 0.5 parts of antioxidant 264, 0.5 parts of ultraviolet absorber, 1 part of stearic acid, 3 parts of processing aid ACR resin, 0.2 parts of dicumyl peroxide, 0.4 parts of trimethylolpropane trimethylacrylate, 0.2 parts of triallyl isocyanurate, and 1 part of modified zirconium phosphate.

[0071] Comparative Example 1

[0072] A PVC hose resistant to heat and high pressure is prepared by adding PVC resin powder, plasticizer DOTP, calcium carbonate, carbon black, calcium-zinc composite stabilizer, antioxidant 264, ultraviolet absorber, and stearic acid into a mixing kettle and stirring at a speed of 800 rpm, and the temperature is raised to 120°C by friction to disperse the raw materials with each other to obtain pre-plasticized PVC. When the pre-plasticized PVC is cooled to 60°C, processing aid ACR resin is added and stirred at a speed of 150 rpm for 5 minutes, and then the mixture is discharged and cooled to obtain PVC powder;

[0073] The PVC powder is added into an inner layer extruder and extruded and cooled to form at a speed of 800 rpm and a plasticizing temperature of 150°C to obtain a PVC inner layer hose. The polyester thread without pretreatment is uniformly woven on the outer wall of the PVC inner layer hose at a density of 20 meshes per 100 mm to obtain a semi-finished woven tube.

[0074] The PVC powder is added into the outer layer extruder, the semi-finished braided tube is extruded and shaped by passing through the die of the outer layer extruder at a rotating speed of 600 rpm and a plasticizing temperature of 170 DEG C, so as to obtain a PVC hose with heat resistance and high pressure resistance.

[0075] The PVC powder comprises the following components by weight: 100 parts of PVC resin powder, 70 parts of plasticizer DOTP, 30 parts of calcium carbonate, 1 part of carbon black, 6 parts of calcium-zinc composite stabilizer, 1 part of antioxidant 264, 1 part of ultraviolet absorber, 2 parts of stearic acid and 5 parts of processing aid ACR.

[0076] Experiment:

[0077] The PVC hoses prepared by using the PVC powder of Examples 1-5 and Comparative Example 1 are subjected to performance test, hot water at 95 DEG C is passed through the PVC hoses and pressure is applied for 1 min, and the obtained data are shown in the following table:

[0078] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Water pressure 3.0 Mpa No rupture No rupture No rupture No rupture No rupture 14 s rupture Water pressure 4.0 Mpa No rupture No rupture No rupture No rupture No rupture - Water pressure 4.5 Mpa 17 s rupture No rupture No rupture No rupture 52 s rupture -

[0079] Conclusion: In Comparative Example 1, the common PVC powder formulation is used, when hot water at 95 DEG C is passed through the PVC hose and pressure of 3.0 MPa is applied, the PVC hose is broken at 14 s, and the performance is poor, so the high temperature resistance and heat resistance performance under pressure of 4.0 MPa and 4.5 MPa are not tested. In Example 1, the PVC powder formulation provided by the present application is used, when hot water at 95 DEG C is passed through the PVC hose and pressure of 4.0 MPa is applied for 1 min, the PVC hose is not broken, and the heat resistance and high pressure resistance performance is excellent. In Examples 2-4, modified zirconium phosphate is added in PVC, the zirconium phosphate loaded with iron ions can enhance the mechanical properties of PVC, and the heat resistance and high pressure resistance performance of the PVC hose is best, when hot water at 95 DEG C is passed through the PVC hose and pressure of 4.0 MPa is applied for 1 min, the PVC hose is not broken. In Example 5, the polyester thread is not pretreated and is not immersed in the impregnating solution containing rosin, and the bonding force between the polyester thread and the PVC hose is poor, when hot water at 95 DEG C is passed through the PVC hose and water pressure of 4.5 MPa is applied, the PVC hose is broken at 52 s.

[0080] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A process for the production of a heat and pressure resistant PVC hose, characterized in that: It comprises the following steps: Step one: take PVC resin powder, plasticizer, calcium carbonate, carbon black, calcium-zinc composite stabilizer, chlorinated polyethylene, antioxidant, ultraviolet absorber, stearic acid, stir, heat to 110-120℃, get pre-plasticized PVC, cooling, add processing aid, dicumyl peroxide, trimethylolpropane trimethylacrylate, triallyl isocyanurate, modified zirconium phosphate, stirring, discharge, cooling, get PVC powder; Step two: add PVC powder to the inner layer extruder, extrude, cool and shape, get PVC inner layer hose, weave polyester thread on the outer wall of the PVC inner layer hose, get semi-finished woven tube; Step three: add PVC powder to the outer layer extruder, put the semi-finished woven tube through the mold of the outer layer extruder, extrude and shape, get a heat-resistant and high-pressure PVC hose; The preparation method of the modified zirconium phosphate is as follows: take citric acid and deionized water, stir evenly to get a citric acid solution; take ferric sulfate and deionized water, stir evenly, add the citric acid solution, stir for 10-15 min to get a mixed solution; take zirconium oxychloride octahydrate and deionized water, stir evenly, add the phosphoric acid solution, add the mixed solution, stir for 10-15 min, react at 175-180℃ for 22-26 h, wash and filter to get the modified zirconium phosphate.

2. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. The PVC powder comprises the following ingredients by weight: 100 parts of PVC resin powder, 60-70 parts of plasticizer, 20-30 parts of calcium carbonate, 0.5-1 part of carbon black, 4-6 parts of calcium-zinc composite stabilizer, 5-8 parts of chlorinated polyethylene, 0.5-1 part of antioxidant, 0.5-1 part of ultraviolet absorber, 1-2 parts of stearic acid, 3-5 parts of processing aid, 0.2-0.5 parts of dicumyl peroxide, 0.4-0.6 parts of trimethylolpropane trimethylacrylate, 0.2-0.5 parts of triallyl isocyanurate, and 2-3 parts of modified zirconium phosphate.

3. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. The plasticizer is plasticizer DOTP, the antioxidant is antioxidant 264, the ultraviolet absorber is UV-9, and the processing aid is ACR resin.

4. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. In step two, the rotation speed of the PVC powder during extrusion is 700-800 rpm, and the temperature is 140-150℃.

5. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. In step two, the density of the polyester thread woven on the outer wall of the PVC inner layer hose is 20 grids per 100 mm.

6. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. In step three, the rotation speed of the PVC powder during extrusion is 500-600 rpm, and the temperature is 160-170℃.

7. The method of claim 1, wherein the PVC hose is resistant to heat and high pressure. In step two, the polyester thread is pretreated, and the pretreatment process is as follows: take rosin and chloroform, stir evenly to get an impregnation solution; immerse the polyester thread in the impregnation solution for 2-3 h, take out and dry to get the treated polyester thread.

8. A heat-resistant and high-pressure PVC hose prepared by the preparation method of a heat-resistant and high-pressure PVC hose according to any one of claims 1-7.