Modified pet material, preparation method thereof, water conduit and application

Abstract

The application discloses a modified PET material and a preparation method, a water guide pipe and application thereof. The modified PET material comprises the following components in parts by weight: PET resin 90-110 parts, glass fiber 8-25 parts, oxidized polyethylene 0.1-0.5 parts, acrylate 4-8 parts, plasticizer 1-3 parts and reinforcing agent 1-3 parts. The modified PET material can have excellent high-temperature resistance, tensile strength and anti-deformation capacity (elongation and longitudinal retraction) under the condition of a relatively thin diameter. Further, the obtained water guide pipe can be arbitrarily bent on the basis of meeting the drainage function and has the properties of high-temperature resistance, high strength and excellent water permeability.

Description

TECHNICAL FIELD

[0001] The present application relates to a modified PET material, a preparation method thereof, a water guide pipe and an application. BACKGROUND

[0002] In bridge deck pavement, water is easily penetrated from the interface between the curb and the original pavement and the new pavement, and water is accumulated in the upper part of the waterproof layer in the asphalt mixture, which leads to early damage of the pavement, so it is necessary to provide a pavement water guide pipe.

[0003] Plastic blind ditch is a common drainage system, which has the advantages of corrosion resistance and high durability, and is widely used in urban drainage engineering, road engineering and other fields. Figure 1 The material of the common plastic blind ditch includes polyvinyl chloride (PVC), high-density polyethylene (HDPE) and polypropylene (PP). The plastic blind ditch has the defects of complex forming, poor heat resistance, poor toughness, insufficient strength when the pipe width is 10-20 cm, difficulty in bending when encountering a curved section, large odor pollution, and relatively weak water permeability. For example, the common PVC drainage pipe needs to be customized at the curved part, which causes high cost and complex paving problems.

[0004] With the progress of science and technology, the development of high-performance, green and environmentally friendly plastic pipes is the development goal of the plastic pipe industry. Through material modification and technological innovation of processing technology, or using new materials, plastic pipes with better performance than traditional plastic pipes are manufactured, which is the main direction of plastic pipe technology innovation. SUMMARY

[0005] In order to overcome the deficiencies in the prior art, the present application provides a modified PET material, a preparation method thereof, a water guide pipe and an application. The modified PET material of the present application can have excellent high-temperature resistance, tensile strength and anti-deformation ability (elongation and longitudinal retraction) even in the case of a small diameter. Further, the obtained water guide pipe can be arbitrarily bent while meeting the drainage function, and has the properties of high-temperature resistance, high strength and excellent water permeability.

[0006] The present application solves the above technical problems by the following technical solutions.

[0007] The present application provides a modified PET material, which comprises the following components by weight: 90-110 parts of PET resin, 8-25 parts of glass fiber, 0.1-0.5 parts of oxidized polyethylene, 4-8 parts of acrylate, 1-3 parts of plasticizer and 1-3 parts of reinforcing agent.

[0008] In the present application, preferably, the raw material of the PET resin is recycled PET bottles. The PET resin is polyethylene terephthalate known to those skilled in the art.

[0009] Preferably, the PET resin is prepared by the following method: the recycled PET bottles are converted into terephthalic acid and ethylene glycol by hydrogenolysis, the terephthalic acid is esterified with ethylene glycol to synthesize bis-hydroxyethyl terephthalate, and then the bis-hydroxyethyl terephthalate is subjected to polycondensation reaction to obtain the PET resin.

[0010] In the hydrogenolysis process, a tridentate pincer ruthenium catalyst RuPNN(CO)H can be used.

[0011] In the hydrogenolysis process, the temperature can be 150-170℃, for example, 160℃.

[0012] In the hydrogenolysis process, the pressure of H2 can be 52-56 bar, for example, 54 bar.

[0013] The chemical equation of the esterification reaction is as follows:

[0014]

[0015] In the polycondensation reaction, a magnesium acetate catalyst can be used. The bis-hydroxyethyl terephthalate is subjected to polycondensation to obtain poly-bis-hydroxyethyl terephthalate (melting point: 110℃), the dimer of which has a melting point of 169-170℃, the trimer and tetramer thereof have a melting point of 200-202℃, and finally the tetramer bis-hydroxyethyl terephthalate is formed.

[0016] More preferably, the PET resin is prepared by the method of Example 1 of paragraphs [0031-0037] of the specification of JP4080720B2.

[0017] In the present application, the content of the PET resin can be 95-105 parts, for example, 95 parts, 100 parts, 101 parts or 105 parts.

[0018] In the present application, the glass fiber can be an alkali-free glass fiber. The alkali-free glass fiber is a glass fiber with a low content of alkali metal oxides (generally not more than 0.5%) which is commonly understood in the art, and has the characteristics of high tensile strength, good heat resistance (the influence on strength is still small when the temperature reaches 300℃), corrosion resistance and less pollution.

[0019] Preferably, the tensile strength of the alkali-free glass fiber is 6.3-6.9 g / d, for example, 6.6 g / d. Preferably, the wet state of the alkali-free glass fiber is 5.4-5.8 g / d, for example, 5.6 g / d.

[0020] In the present application, the glass fiber can be sourced from Owens Corning or the giant stone group, for example, the alkali-free glass fiber 64123 sourced from the giant stone group. The tensile strength of the alkali-free glass fiber is 6.6 g / d, and the wet state is 5.6 g / d.

[0021] In the present application, preferably, the content of the glass fiber is preferably 10-20 parts, for example, 10 parts, 15 parts or 20 parts. The glass fiber has the function of improving the strength of the product, but its amount should not be too much, otherwise the material is easy to be brittle. Therefore, in order to ensure the strength of the product, some reinforcing agents need to be added to the components of the modified PET material to supplement the strength of the material. In addition, if the glass fiber is too much, in order to ensure the performance of the product, the amount of acrylate needed to be increased, which is not easy to mix uniformly in the subsequent reaction process, increasing the processing difficulty and cost.

[0022] In the present application, the density of the oxidized polyethylene can be 0.97-1 g / cm 3 , for example, 0.99 g / cm 3 .

[0023] In the present application, the viscosity of the oxidized polyethylene can be 11000-22000 cps, for example, 18000 cps.

[0024] In the present application, the acid value of the oxidized polyethylene can be 16-22 mg KOH / g, for example, 17 mg KOH / g.

[0025] In the present application, the bulk density of the oxidized polyethylene can be 500-700 kg / m 3 , for example, 502 kg / m 3 or 600 kg / m 3 .

[0026] In the present application, the melting point of the oxidized polyethylene can be 120-140℃, for example, 140℃. The oxidized polyethylene with the melting point in this range can avoid the influence on the high temperature resistance.

[0027] In the present application, the oxidized polyethylene can be sourced from BASF or Honeywell, for example, the OA sourced from BASF. The density of the oxidized polyethylene is 0.99 g / cm 3 , the viscosity is 18000 cps, the acid value is 17 mg KOH / g, the bulk density is 502 kg / m 3 , and the melting point is 140℃.

[0028] In the present application, preferably, the content of the oxidized polyethylene is 0.1-0.5 parts, for example, 0.1, 0.3 or 0.4 parts. The addition of the oxidized polyethylene can improve the compatibility of the modified PET material, so that the prepared water guide pipe has good internal and external lubricity.

[0029] In the present application, the acrylate can be hydroxypropyl acrylate, for example, hydroxypropyl acrylate (2-HPA) from Shandong Derui High Polymer Material Co., Ltd. The hydroxypropyl acrylate is a colorless transparent liquid, with an ester content of ≥98%, a relative density (water = 1) of 1.054, a boiling point of 77℃ / 666.6PPETa, a freezing point of -70℃, and a flash point of 100℃ (open) 89℃ (closed).

[0030] In the present application, preferably, the content of the acrylate is 5-6 parts, for example, 5 or 6 parts. If the content of the acrylate is too much and the content of the glass fiber is unchanged, the frictional resistance of the product prepared is larger.

[0031] In the present application, the type of the plasticizer can be styrene butadiene rubber and / or natural rubber. Both the styrene butadiene rubber and the natural rubber can be purchased from Shanghai Mingzhi Industry Co., Ltd.

[0032] Among them, when the styrene butadiene rubber and the natural rubber are used as the plasticizer, the mass ratio of the styrene butadiene rubber to the natural rubber can be 1:(1-1.2), for example, 1:1.

[0033] In the present application, the content of the plasticizer can be 1-2 parts, for example, 1 part or 2 parts. If the amount of the plasticizer is too much, the product is prone to brittle fracture, the anti-deformation ability (elongation and longitudinal retraction) is reduced, even the longitudinal retraction is lost, at the same time, the tensile strength is also weakened, and the above defects are also difficult to solve by adjusting the ratio of other ingredients.

[0034] In the present application, the reinforcing agent can be DH-1 reinforcing agent. The DH-1 reinforcing agent can be purchased from Taicang Dahao Industry Co., Ltd. In the present application, the reinforcing agent does not include glass fiber.

[0035] In the present application, the content of the reinforcing agent can be 1-2 parts, for example, 1 part or 2 parts.

[0036] In the present application, the component can further include a lubricant and / or a pigment.

[0037] Among them, the type of the lubricant can be ethylene bis-oleic acid amide and / or hydrocarbon wax. The hydrocarbon wax can be one or more of conventional straight-chain alkane wax, branched-chain alkane wax and naphthenic wax. Compared with ethylene bis-oleic acid amide, the hydrocarbon wax lubricant has good lubrication effect at the initial stage of extrusion processing and good thermal stability, but because of the slightly poor compatibility, too much amount of the hydrocarbon wax lubricant will make the material easy to stick. Preferably, the lubricant is ethylene bis-oleic acid amide.

[0038] Among them, the lubricant can be from Exxon Mobil, BASF, Toray, AkzoNobel or Dow Chemical. The ethylene bis-oleic acid amide can be purchased from Dow Chemical.

[0039] The content of the lubricant can be 0.3-0.7 parts. The selected lubricant in the application not only plays the role of external lubricant, facilitating demolding, preventing static electricity and adhesion, but also plays the role of internal lubricant, having good compatibility with the PET resin. When the raw material of the PET resin is recycled PET bottles, the PET plastic melt inside plays a role in reducing the intermolecular cohesive force, can reduce the internal friction of the plastic melt, increase the melting rate and melt deformation of the PET plastic melt, reduce the viscosity of the PET plastic melt and improve the plasticizing performance.

[0040] The type of the pigment can be toner and / or titanium dioxide. The ratio of the toner and titanium dioxide is adjusted according to the requirement. If dark color is needed, the ratio of titanium dioxide is reduced; if light color is needed, the ratio of titanium dioxide is increased. The toner can be titanium dioxide of Shandong Dongjia R2377 purchased from Shanghai Stable Color Chemical Technology Co., Ltd. The titanium dioxide can be phthalocyanine green G purchased from Shanghai Stable Color Chemical Technology Co., Ltd.

[0041] The content of the pigment can be 3-8 parts. The toner can be 2-3 parts, for example, 2 parts or 3 parts. The titanium dioxide can be 1-5 parts, for example, 2 parts.

[0042] In the application, the frictional resistance of the modified PET material can be 0.0071-0.0082 N, for example, 0.0071 N, 0.0076 N, 0.0078 N, 0.0079 N, 0.0080 N or 0.0082 N.

[0043] In the application, the density of the modified PET material can be 1.53-1.54 g / m 3 , for example, 1.53 g / m 3 or 1.54 g / m 3 .

[0044] In the application, the diameter of the modified PET material can be 6-10 mm, preferably 7-9 mm; for example, the modified PET material is a PET fiber fine line with a diameter of 8 mm.

[0045] The application also provides a preparation method of the modified PET material, which comprises the following steps: after the PET resin is melted, the remaining components are added, stirred and extruded and granulated.

[0046] In the application, the temperature of the melting can be 240-280℃, for example, 260℃.

[0047] In the application, the temperature of the stirring can be 190-230℃, preferably 200-220℃, for example, 210℃.

[0048] In the present application, the stirring rate can be 1000-1500 r / min, for example 1300 r / min.

[0049] In the present application, the stirring time can be 20-30 min, for example 25 min.

[0050] In the present application, after the stirring, before the extrusion granulation, the operation of cooling can be further included.

[0051] In the present application, the cooling temperature can be 60-80℃, for example 70℃.

[0052] In the present application, the cooling equipment can be a cooling roller machine. During the cooling process, if the cooling temperature is too low, it will be difficult to extrude; if the cooling temperature is too high, it will not be easy to shape.

[0053] In the present application, during the extrusion granulation, the diameter of the extruder can be 6-10 mm, preferably 7-9 mm, for example 8 mm. In the prior art, in order to ensure the strength of the water guide pipe, the diameter of the PET material is generally thick, while the present application can achieve a thin diameter, high strength and easy bending of the modified PET material, which plays a role in drainage and enhances the structural strength while facilitating construction.

[0054] The present application also provides a water guide pipe comprising the modified PET material.

[0055] In the present application, preferably, the water guide pipe is made by weaving the modified PET material.

[0056] In the present application, the weaving can be performed by a screw machine.

[0057] In the present application, under the condition of ensuring the performance of the water guide pipe, the number of weaving machine heads can be selected according to the diameter requirement of the water guide pipe. Preferably, the weaving is performed by a weaving net composed of 12-18 weaving machine heads, for example, 12 weaving machine heads.

[0058] In the present application, the water guide pipe can be a bridge deck paving water-permeable special water guide pipe.

[0059] In the present application, the bridge deck can be a high-level cement concrete bridge deck.

[0060] In the present application, the mass of the modified PET material can be 48-154 g, preferably 84-87 g, for example 84 g, 85 g or 87 g.

[0061] In the present application, the diameter of the modified PET material can be 10-30 mm, for example 20 mm.

[0062] The present application also provides an application of the water guide pipe in bridge deck paving.

[0063] In the present application, the bridge deck can be a high elevated cement concrete bridge deck.

[0064] In the present application, preferably, the application steps are as follows:

[0065] ① The paving surface road water is drained by the road longitudinal and transverse slope drainage to the bridge deck rainwater collection well;

[0066] ② Before the paving construction, the waterproof coating (such as solvent-based asphalt binder) should be brushed on each edge structure in advance;

[0067] ③ In order to exclude the water between the paving structure layers, the water guide pipe should be arranged at the asphalt mixture edge of the drainage side;

[0068] ④ The water guide pipe should be arranged at the edge of the lower layer; after the drainage pipe is placed and fixed, the subsequent construction can be continued;

[0069] ⑤ The connection structure of the water guide pipe and the rainwater collection well is shown in detail Figure 3 .

[0070] On the basis of the common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, the preferred examples of the present application are obtained.

[0071] The reagents and raw materials used in the present application are commercially available.

[0072] The positive progress effect of the present application is that:

[0073] The modified PET material of the present application can have excellent tensile strength (38.8-42.2 MPa can be achieved) and anti-deformation ability (elongation rate of 198.4-225.8%, longitudinal shrinkage of 3.2-3.8%) even in the case of being relatively thin (diameter of only 8 mm); and also has high temperature resistance, and can be free of deformation or have slight deformation at 300℃.

[0074] The conventional bridge drainage is drainage ditch + gravel or open ditch, and the water guide pipe provided by the present application can be buried inside, and on the basis of achieving the drainage function, can be arbitrarily curved to meet the road linear design requirements, and has the properties of high temperature resistance, high strength, and excellent water permeability. At the same time, the water guide pipe provided by the present application has a relatively light weight, facilitating transportation and construction. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 It is a structural diagram of a plastic blind ditch used in the conventional technology.

[0076] Figure 2 It is a structural diagram of the water guide pipe prepared in Example 1.

[0077] Figure 3 It is a schematic diagram of the edge drainage structure. Detailed Implementation

[0078] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0079] In the embodiments of the present invention, the PET resin is made from recycled PET bottles, and the preparation method is described in Example 1 of paragraphs [0031-0037] of the specification of JP4080720B2.

[0080] All other components are commercially available, as detailed in the table below:

[0081]

[0082] Example 1

[0083] 105 parts of PET resin were melted at 260℃. Then, 10 parts of glass fiber, 0.1 parts of high-density oxidized polyethylene, 5 parts of acrylate, 0.3 parts of lubricant, 1 part of plasticizer, 2 parts of colorant, 2 parts of titanium dioxide, and 1 part of reinforcing agent were added to a reaction vessel and heated and mixed at 210℃ and a stirring speed of 1300 r / min for 25 minutes to ensure complete reaction. After mixing, the material was conveyed to a cooling roller mill. When the material temperature in the cooling roller mill cooled to 70℃, it was fed into an extruder to extrude PET fiber filaments with a diameter of 8 mm, thus obtaining modified PET material. A water guide pipe was made by weaving a mesh composed of 12 weaving heads. The structural diagram of the water guide pipe is shown below. Figure 2 As shown.

[0084] Example 2

[0085] 105 parts of PET resin, 10 parts of glass fiber, 0.3 parts of high-density oxidized polyethylene, 6 parts of acrylate, 0.3 parts of lubricant, 1 part of plasticizer, 3 parts of colorant, 2 parts of titanium dioxide, and 2 parts of reinforcing agent were added to a reaction vessel and heated and mixed at a stirring temperature of 210℃ and a stirring speed of 1300 r / min for 25 minutes to ensure complete reaction. After stirring, the material was conveyed to a cooling roller mill. When the material temperature in the cooling roller mill was cooled to 70℃, it was fed into an extruder to extrude PET fiber filaments with a diameter of 8 mm, thus obtaining modified PET material. A water guide pipe was made by weaving a mesh composed of 12 weaving heads.

[0086] Example 3

[0087] PET resin 101 parts, glass fiber 20 parts, high density polyethylene oxide 0.1 part, acrylate 5 parts, lubricant 0.3, plasticizer 1 part, color powder 2 parts, titanium white powder 2 parts, reinforcing agent 1 part are added into the reaction kettle for heating, mixing and stirring, the stirring temperature is 210℃, the stirring rate is 1300r / min, the material is stirred uniformly for 25min and fully reacted under the condition; after the stirring is finished, the material is transported to the cooling roll machine, when the material temperature in the cooling roll machine is cooled to 70℃, it is put into the extruder, PET fiber fine line with diameter of 8mm is extruded, modified PET material is prepared. The braided net composed of 12 braided fabric heads is used for braiding, and the water pipe is prepared.

[0088] Example 4

[0089] PET resin 95 parts, glass fiber 20 parts, high density polyethylene oxide 0.3 parts, acrylate 6 parts, lubricant 0.3, plasticizer 1 part, color powder 2 parts, titanium white powder 2 parts, reinforcing agent 1 part are added into the reaction kettle for heating, mixing and stirring, the stirring temperature is 210℃, the stirring rate is 1300r / min, the material is stirred uniformly for 25min and fully reacted under the condition; after the stirring is finished, the material is transported to the cooling roll machine, when the material temperature in the cooling roll machine is cooled to 70℃, it is put into the extruder, PET fiber fine line with diameter of 8mm is extruded, modified PET material is prepared. The braided net composed of 12 braided fabric heads is used for braiding, and the water pipe is prepared.

[0090] Example 5

[0091] PET resin 95 parts, glass fiber 10 parts, high density polyethylene oxide 0.3 parts, acrylate 6 parts, lubricant 0.3, plasticizer 1 part, color powder 3 parts, titanium white powder 2 parts, reinforcing agent 2 parts are added into the reaction kettle for heating, mixing and stirring, the stirring temperature is 210℃, the stirring rate is 1300r / min, the material is stirred uniformly for 25min and fully reacted under the condition; after the stirring is finished, the material is transported to the cooling roll machine, when the material temperature in the cooling roll machine is cooled to 70℃, it is put into the extruder, PET fiber fine line with diameter of 8mm is extruded, modified PET material is prepared. The braided net composed of 12 braided fabric heads is used for braiding, and the water pipe is prepared.

[0092] Example 6

[0093] PET resin 100 parts, glass fiber 15 parts, high-density polyethylene oxide 0.4 parts, acrylate 5 parts, lubricant 0.5 parts, plasticizer 1 part, toner 2 parts, titanium dioxide 2 parts, reinforcing agent 1 part are added into a reaction kettle, heated, mixed, stirred, the stirring temperature is 210℃, the stirring rate is 1300r / min, under the condition of uniform stirring for 25min and full reaction; after stirring, the material is transported to the cooling roll machine, when the material temperature in the cooling roll machine is cooled to 70℃, it is put into the extruder, PET fiber fine line with 8mm diameter is extruded, and modified PET material is prepared. The braided net is braided by using 12 braiding heads, and the water pipe is prepared.

[0094] Effect implementation example 1

[0095] The detection items of the modified PET material include heat resistance, elongation, tensile strength, longitudinal shrinkage, friction resistance and density.

[0096] The detection items of the water pipe include mass and diameter. The water pipe with a length of 20cm is taken for detection.

[0097] The test results are shown in Table 1:

[0098] Table 1

[0099]

[0100] As shown in Table 1, the modified PET material and the water pipe prepared in examples 1-6 can achieve excellent effects. In the case that the diameter of the modified PET material is only 8mm, the modified PET material has excellent tensile strength (can achieve 38.8-42.2MPa) and anti-deformation ability (can achieve elongation of 198.4-225.8%, longitudinal shrinkage of 3.2-3.8%); also has high temperature resistance, can be deformed or slightly deformed at 300℃. At the same time, the water pipe provided by the application has light weight, which is convenient for transportation and construction.

[0101] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A modified PET material, characterized in that, It comprises the following components by weight: PET resin 90-110 parts, glass fiber 8-25 parts, oxidized polyethylene 0.1-0.5 parts, acrylate 4-8 parts, plasticizer 1-3 parts, reinforcing agent 1-3 parts; The raw material of the PET resin is recycled PET bottles; The acrylate is hydroxypropyl acrylate; The reinforcing agent is DH-1 reinforcing agent.

2. The modified PET material of claim 1, wherein, It meets one or more of the following conditions: (1) The content of the PET resin is 95-105 parts; (2) The glass fiber is alkali-free glass fiber; (3) The content of the glass fiber is 10-20 parts; (4) the density of the oxidized polyethylene is 0.97-1 g / cm 3 ; (5) The viscosity of the oxidized polyethylene is 11000-22000 cps; (6) The acid value of the oxidized polyethylene is 16-22 mg KOH / g; (7) the bulk density of the oxidized polyethylene is 500-700 kg / m 3 ; (8) The melting point of the oxidized polyethylene is 120-140℃; (9) The content of the acrylate is 5-6 parts.

3. The modified PET material of claim 2, wherein, It meets one or more of the following conditions: (1) The content of the PET resin is 95 parts, 100 parts, 101 parts or 105 parts; (2) The tensile strength of the alkali-free glass fiber is 6.3-6.9 g / d; (3) The wet state of the alkali-free glass fiber is 5.4-5.8 g / d; (4) The content of the glass fiber is 10 parts, 15 parts or 20 parts; (5) The content of the oxidized polyethylene is 0.1, 0.3 or 0.4 parts; (6) The content of the acrylate is 5 or 6 parts.

4. The modified PET material of claim 1, wherein, It meets one or more of the following conditions: (1) The type of the plasticizer is butadiene styrene rubber and / or natural rubber; (2) The content of the plasticizer is 1-2 parts; (3) The content of the reinforcing agent is 1-2 parts; (4) The components further comprise a lubricant and / or a pigment.

5. The modified PET material of claim 4, wherein, It meets one or more of the following conditions: (1) When butadiene styrene rubber and natural rubber are used as plasticizers, the mass ratio of the butadiene styrene rubber to the natural rubber is 1:(1-1.2); (2) The content of the plasticizer is 1 part or 2 parts; (3) The content of the reinforcing agent is 1 part or 2 parts; (4) The type of the lubricant is ethylene bis-oleic acid amide and / or hydrocarbon wax; (5) The content of the lubricant is 0.3-0.7 parts; (6) The type of the pigment is color powder and / or titanium white powder; (7) The content of the pigment is 3-8 parts.

6. The modified PET material of claim 5, wherein, It meets one or more of the following conditions: (1) When butadiene styrene rubber and natural rubber are used as plasticizers, the mass ratio of the butadiene styrene rubber to the natural rubber is 1:1; (2) The type of the lubricant is ethylene bis-oleic acid amide; (3) The content of the color powder is 2-3 parts; (4) The content of the titanium white powder is 1-5 parts.

7. The modified PET material of claim 2, wherein, The preparation method of the PET resin is as follows: the recycled PET bottles are converted into terephthalic acid and ethylene glycol by hydrogen cracking, then the terephthalic acid and the ethylene glycol are esterified to synthesize bis-hydroxyethyl terephthalate, and then a polycondensation reaction is carried out to obtain the PET resin.

8. The modified PET material of claim 7, wherein, (1) the trident pincer-shaped ruthenium catalyst RuPNN(CO)H is used in the hydrocracking process; (2) the temperature is 150-170℃ in the hydrocracking process; (3) the pressure of H2 is 52-56 bar in the hydrocracking process; (4) the magnesium acetate catalyst is used in the polycondensation reaction.

9. The modified PET material of claim 1, wherein The frictional resistance of the modified PET material is 0.0071-0.0082 N; and / or the density of the modified PET material is 1.53-1.54 g / m 3 .

10. A process for the preparation of a modified PET material as claimed in any one of claims 1 to 9, characterized in that, The preparation method comprises the following steps: after the PET resin is melted, the remaining components are added, stirred, extruded and granulated.

11. The method of making a modified PET material according to claim 10, wherein, It meets one or more of the following conditions: (1) the melting temperature is 240-280℃; (2) the stirring temperature is 190-230℃; (3) the stirring rate is 1000-1500 r / min; (4) the stirring time is 20-30 min; (5) after the stirring, the operation of cooling is further included before the extrusion and granulation.

12. The method for preparing the modified PET material as described in claim 11, characterized in that, It meets one or more of the following conditions: (1) the melting temperature is 260℃; (2) the stirring temperature is 200-220℃; (3) the stirring rate is 1300 r / min; (4) the stirring time is 25 min; (5) the cooling temperature is 60-80℃.

13. The method for preparing the modified PET material as described in claim 12, characterized in that, The stirring temperature is 210℃.

14. A water conduit, characterized in that It comprises the modified PET material according to any one of claims 1-9.

15. The water conduit of claim 14, wherein, It meets one or more of the following conditions: (1) the water guide pipe is made by weaving the modified PET material; (2) the water guide pipe is a bridge deck paving water-permeable special water guide pipe; (3) the mass of the modified PET material is 48-154 g.

16. The water conduit of claim 15, wherein, It meets one or more of the following conditions: (1) the water guide pipe is made by weaving the woven net composed of 12-18 weaving heads; (2) the bridge deck is a high-level cement concrete bridge deck; (3) the mass of the modified PET material is 84-87 g.

17. The water conduit of claim 16, wherein, The water guide pipe is made by weaving the woven net composed of 12 weaving heads.

18. The water guide pipe according to any one of claims 14-17 in the application of bridge deck paving.

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