Modified PET (Polyethylene Terephthalate) material, preparation method thereof, aqueduct and application

Abstract

The invention discloses a modified PET (Polyethylene Terephthalate) material, a preparation method thereof, a water guide pipe and application. The modified PET material comprises the following components in parts by weight: 90-110 parts of PET resin, 8-25 parts of glass fibers, 0.1-0.5 part of oxidized polyethylene, 4-8 parts of acrylate, 1-3 parts of a plasticizer and 1-3 parts of a reinforcing agent. The modified PET material disclosed by the invention has excellent high temperature resistance, tensile strength and deformation resistance (elongation and longitudinal retraction) under the condition that the diameter is relatively small; furthermore, the obtained aqueduct can be bent at will 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 invention relates to a modified PET material, a preparation method thereof, a water conduit and application thereof. Background Art

[0002] In bridge deck paving, water easily seeps from the interface between the curb and the original pavement and the new pavement. Water accumulates inside the asphalt mixture and on the upper part of the waterproof layer, leading to early damage to the pavement. Therefore, it is very necessary to install water pipes.

[0003] Plastic blind ditch is a common drainage system with the advantages of corrosion resistance and durability. It is widely used in urban drainage engineering, road engineering and other fields. Its structure is as follows: Figure 1 As shown. Common materials of plastic blind drains include polyvinyl chloride (PVC), high-density polyethylene (HDPE), and polypropylene (PP). Plastic blind drains generally have defects such as complex molding, poor heat resistance, poor toughness, insufficient strength when the pipe width is 10-20cm, difficulty in bending when encountering curved sections, strong odor and pollution, and relatively weak water permeability. For example, the common PVC drainage pipe needs to be customized in the curved part, resulting in high cost and complex paving.

[0004] With the advancement of science and technology, the development of high-performance, green and environmentally friendly plastic pipes is the development goal of the plastic pipe industry. The main direction of plastic pipe technology innovation is to create better performance than traditional plastic pipes through technological innovation of material modification and processing technology, or the use of new materials. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a modified PET material and a preparation method thereof, a water conduit and application thereof. The modified PET material of the present invention can achieve excellent high temperature resistance, tensile strength and deformation resistance (elongation and longitudinal shrinkage) in the case of a thinner diameter; further, the obtained water conduit can be bent arbitrarily on the basis of satisfying the drainage function, and has the properties of high temperature resistance, high strength and excellent water permeability.

[0006] The present invention solves the above technical problems through the following technical solutions.

[0007] The invention provides a modified PET material, which comprises the following components in parts 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 invention, 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] Among them, preferably, the preparation method of the PET resin is as follows: the recycled PET bottles are converted into terephthalic acid and ethylene glycol by hydrogenation cracking, and then terephthalic acid and ethylene glycol are esterified to synthesize dihydroxyethyl terephthalate, and then a condensation reaction is carried out to obtain PET resin.

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

[0011] During the hydrocracking process, the temperature may be 150-170°C, such as 160°C.

[0012] During the hydrocracking process, H 2 The pressure may 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, magnesium acetate catalyst can be used to polycondense bis(hydroxyethyl) terephthalate into poly(bis(hydroxyethyl) terephthalate) (melting point is 110° C.), the melting point of dimer is 169-170° C., the melting point of trimer and tetramer is 200-202° C., and finally tetramer bis(hydroxyethyl) terephthalate is formed.

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

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

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

[0019] The tensile strength of the alkali-free glass fiber is preferably 6.3-6.9 g / d, such as 6.6 g / d. The wet state of the alkali-free glass fiber is preferably 5.4-5.8 g / d, such as 5.6 g / d.

[0020] In the present invention, the glass fiber can be derived from Owens Corning or Jushi Group, such as Jushi Group's alkali-free glass fiber 64123. The alkali-free glass fiber has a tensile strength of 6.6 g / d and a wet state of 5.6 g / d.

[0021] In the present invention, preferably, the content of the glass fiber is preferably 10-20 parts, for example 10 parts, 15 parts or 20 parts. Glass fiber has the function of improving product strength, but its dosage should not be too much. If it is too much, the material is 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 of the present invention to supplement the material strength. In addition, if there are too many glass fibers, in order to ensure product performance, the amount of acrylate required increases, and in the subsequent reaction process, it is not easy to mix evenly, which increases the difficulty of processing and the cost is high.

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

[0023] In the present invention, the viscosity of the oxidized polyethylene may be 11000-22000 cps, such as 18000 cps.

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

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

[0026] In the present invention, the melting point of the oxidized polyethylene may be 120-140° C., for example, 140° C. The oxidized polyethylene having a melting point within this range can avoid the influence on high temperature resistance.

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

[0028] In the present invention, preferably, the content of the oxidized polyethylene is 0.1-0.5 parts, such as 0.1, 0.3 or 0.4 parts. The addition of oxidized polyethylene can improve the compatibility of the modified PET material, so that the prepared water pipe has good internal and external lubrication properties.

[0029] In the present invention, the acrylic acid ester may be hydroxypropyl acrylate, such as hydroxypropyl acrylate (2-HPA) from Shandong Derui Polymer Materials 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°C / 666.6PPETa, a freezing point of -70°C, and a flash point of 100°C (open) to 89°C (closed).

[0030] In the present invention, preferably, the content of the acrylic ester is 5-6 parts, such as 5 or 6 parts. If the content of the acrylic ester is too much and the content of the glass fiber remains unchanged, the friction resistance of the obtained product is relatively large.

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

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

[0033] In the present invention, the content of the plasticizer can be 1-2 parts, for example, 1 part or 2 parts. If the amount of plasticizer used is too much, the product is easy to break, the deformation resistance (elongation and longitudinal shrinkage) is reduced, and the longitudinal shrinkage is even lost, and the tensile strength is also weakened. In addition, it is difficult to solve the above defects by adjusting the ratio of other components.

[0034] In the present invention, the reinforcing agent may be a DH-1 reinforcing agent. The DH-1 reinforcing agent may be purchased from Taicang Dahao Industrial Co., Ltd. In the present invention, the reinforcing agent does not include glass fiber.

[0035] In the present invention, the content of the enhancer may be 1-2 parts, for example, 1 part or 2 parts.

[0036] In the present invention, the components may further include a lubricant and / or a pigment.

[0037] Wherein, the type of lubricant can be ethylene bisoleamide and / or hydrocarbon wax. The hydrocarbon wax can be one or more of conventional straight-chain alkane wax, branched-chain alkane wax and cycloalkane wax. Compared with ethylene bisoleamide, hydrocarbon wax lubricants have good lubrication effect and good thermal stability in the initial stage of extrusion processing, but because of slightly poor compatibility, excessive use will make the material sticky. Preferably, the lubricant is ethylene bisoleamide.

[0038] The lubricant can be sourced from ExxonMobil, BASF, Toray, Akzo Nobel or Dow Chemical. The ethylene bisoleamide can be purchased from Dow Chemical.

[0039] The content of the lubricant can be 0.3-0.7 parts. The lubricant selected in the present invention not only acts as an external lubricant, which is convenient for demolding, preventing static electricity and adhesion, but also acts as an internal lubricant, and has good compatibility with PET resin. When the raw material of PET resin is recycled PET bottles, it plays a role in reducing the cohesive force between molecules inside the PET plastic melt, which 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 pigment may be toner and / or titanium dioxide. The ratio of toner to titanium dioxide is adjusted according to demand. If a dark color is required, the ratio of titanium dioxide is reduced; if a light color is required, the ratio of titanium dioxide is increased. The toner may be Shandong Dongjia R2377 titanium dioxide purchased from Shanghai Wenyan Chemical Technology Co., Ltd. The titanium dioxide may be phthalocyanine green G purchased from Shanghai Wenyan Chemical Technology Co., Ltd.

[0041] The content of the pigment may be 3-8 parts, the content of the toner may be 2-3 parts, such as 2 parts or 3 parts, and the content of the titanium dioxide may be 1-5 parts, such as 2 parts.

[0042] In the present invention, the friction resistance of the modified PET material may be 0.0071-0.0082N, for example, 0.0071N, 0.0076N, 0.0078N, 0.0079N, 0.0080N or 0.0082N.

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

[0044] In the present invention, the diameter of the modified PET material may be 6-10 mm, preferably 7-9 mm; for example, the modified PET material is a PET fiber thread with a diameter of 8 mm.

[0045] The present invention also provides a method for preparing the modified PET material, which comprises the following steps: melting the PET resin, adding the remaining components, stirring, and extruding to form granules.

[0046] In the present invention, the melting temperature may be 240-280°C, for example 260°C.

[0047] In the present invention, the stirring temperature may be 190-230°C, preferably 200-220°C, such as 210°C.

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

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

[0050] In the present invention, a cooling operation may be further included after the stirring and before the extrusion granulation.

[0051] The cooling temperature may be 60-80°C, for example 70°C.

[0052] Wherein, the cooling device 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 be difficult to shape.

[0053] In the present invention, 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 pipe, the PET material generally selected has a relatively thick diameter, while the present invention can achieve a modified PET material with a thin diameter, high strength, and easy bending, which plays a role in drainage and enhancing structural strength while being easy to construct.

[0054] The present invention also provides a water conduit, which comprises the modified PET material.

[0055] In the present invention, preferably, the water conduit is made by weaving modified PET material.

[0056] Wherein, the weaving can be carried out by using a screw machine.

[0057] Wherein, under the condition of ensuring the performance of the water pipe, the number of braiding heads can be selected according to the diameter requirement of the water pipe. Preferably, the braided mesh composed of 12-18 braiding heads is braided, for example, 12 braiding heads are used.

[0058] In the present invention, the water conduit may be a special water conduit for bridge deck pavement permeability.

[0059] Wherein, the bridge deck may be an elevated cement concrete bridge deck.

[0060] In the present invention, the mass of the modified PET material may be 48-154 g, preferably 84-87 g, such as 84 g, 85 g or 87 g.

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

[0062] The present invention also provides an application of the above-mentioned water conduit in bridge deck paving.

[0063] In the present invention, the bridge deck may be an elevated cement concrete bridge deck.

[0064] In the present invention, preferably, the steps of applying are as follows:

[0065] ① The water on the pavement surface is drained from the longitudinal and transverse slopes of the road to the rainwater collection well on the bridge deck;

[0066] ② Before paving, each edge structure should be painted with waterproof coating (such as solvent-based asphalt binder);

[0067] ③ In order to drain water between the pavement structure layers, the water guide pipe should be installed at the edge of the asphalt mixture on the drainage side;

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

[0069] ⑤ The connection structure between the water pipe and the rainwater collection well is detailed in Figure 3 .

[0070] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

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

[0072] The positive and progressive effects of the present invention are:

[0073] The modified PET material of the present invention can have excellent tensile strength (can achieve 38.8-42.2MPa) and deformation resistance (can achieve elongation of 198.4-225.8% and longitudinal shrinkage of 3.2-3.8%) when it is relatively thin (only 8mm in diameter); it also has high temperature resistance and can be deformed or slightly deformed at 300°C.

[0074] Conventional bridge drainage is drainage ditch + gravel or open ditch, the water conduit provided by the present invention can be buried in it, on the basis of achieving the drainage function, it can also be bent arbitrarily to meet the linear design requirements of the road, and has the performance of high temperature resistance, high strength and excellent water permeability. At the same time, the water conduit provided by the present invention is light in weight, which is convenient for transportation and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 This is a structural diagram of a plastic blind ditch used in traditional technology.

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

[0077] Figure 3 Schematic diagram of edge drainage structure. DETAILED DESCRIPTION

[0078] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

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

[0080] Other components are commercially available, as shown in the following table:

[0081]

[0082] Example 1

[0083] 105 parts of PET resin are melted at 260°C, and 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 color powder, 2 parts of titanium dioxide, and 1 part of reinforcing agent are added into the reactor for heating, mixing and stirring. The stirring temperature is 210°C, and the stirring rate is 1300r / min. Stir evenly for 25 minutes and react fully. After stirring, the material is transported to the cooling roller feeder. When the temperature of the material in the cooling roller feeder is cooled to 70°C, it is put into the extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain modified PET material. A water pipe is made by weaving a woven mesh composed of 12 braided heads. The structural diagram of the water pipe is shown in the figure below. Figure 2 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 color powder, 2 parts of titanium dioxide, and 2 parts of reinforcing agent were added into a reactor for heating, mixing, and stirring at a temperature of 210°C and a stirring rate of 1300r / min for 25 minutes for full reaction; after stirring, the material was transported to a cooling roller feeder, and when the material temperature in the cooling roller feeder was cooled to 70°C, it was put into an extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain a modified PET material. A braided net composed of 12 braided heads was used for weaving to obtain a water guide pipe.

[0086] Example 3

[0087] 101 parts of PET resin, 20 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 color powder, 2 parts of titanium dioxide, and 1 part of reinforcing agent were added into a reactor for heating, mixing, and stirring at a temperature of 210°C and a stirring rate of 1300r / min for 25 minutes for full reaction; after stirring, the material was transported to a cooling roller feeder, and when the material temperature in the cooling roller feeder was cooled to 70°C, it was put into an extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain a modified PET material. A braided net composed of 12 braided heads was used for weaving to obtain a water guide pipe.

[0088] Example 4

[0089] 95 parts of PET resin, 20 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, 2 parts of color powder, 2 parts of titanium dioxide, and 1 part of reinforcing agent were added into a reactor for heating, mixing, and stirring at a temperature of 210°C and a stirring rate of 1300r / min for 25 minutes for full reaction; after stirring, the material was transported to a cooling roller feeder, and when the material temperature in the cooling roller feeder was cooled to 70°C, it was put into an extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain a modified PET material. A braided net composed of 12 braided heads was used for weaving to obtain a water guide pipe.

[0090] Example 5

[0091] 95 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 color powder, 2 parts of titanium dioxide, and 2 parts of reinforcing agent were added into a reactor for heating, mixing, and stirring at a temperature of 210°C and a stirring rate of 1300r / min for 25 minutes for full reaction; after stirring, the material was transported to a cooling roller feeder, and when the material temperature in the cooling roller feeder was cooled to 70°C, it was put into an extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain a modified PET material. A braided net composed of 12 braided heads was used for weaving to obtain a water guide pipe.

[0092] Example 6

[0093] 100 parts of PET resin, 15 parts of glass fiber, 0.4 parts of high-density oxidized polyethylene, 5 parts of acrylate, 0.5 parts of lubricant, 1 part of plasticizer, 2 parts of color powder, 2 parts of titanium dioxide, and 1 part of reinforcing agent were added into a reactor for heating, mixing, and stirring at a temperature of 210°C and a stirring rate of 1300r / min for 25 minutes for full reaction; after stirring, the material was transported to a cooling roller feeder, and when the material temperature in the cooling roller feeder was cooled to 70°C, it was put into an extruder to extrude PET fiber fine wires with a diameter of 8mm to obtain a modified PET material. A braided net composed of 12 braided heads was used for weaving to obtain a water guide pipe.

[0094] Effect Example 1

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

[0096] The inspection items of the water pipe include quality and diameter. Take a 20cm long water pipe for inspection.

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

[0098] Table 1

[0099]

[0100] As can be seen from Table 1, the modified PET materials and water pipes prepared in Examples 1-6 can achieve excellent effects. When the diameter of the modified PET material is only 8 mm, the modified PET material has excellent tensile strength (can achieve 38.8-42.2 MPa) and deformation resistance (can achieve elongation of 198.4-225.8% and longitudinal retraction of 3.2-3.8%); it also has high temperature resistance and can be deformed or slightly deformed at 300°C. At the same time, the water pipe provided by the present invention is light in weight, which is convenient for transportation and construction.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified PET material, It is characterized in that The invention comprises the following components in parts 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 acrylic acid ester, 1-3 parts of plasticizer and 1-3 parts of reinforcing agent.

2. The modified PET material according to claim 1, It is characterized in that The raw material of the PET resin is recycled PET bottles; and / or, the content of the PET resin is 95-105 parts, such as 95 parts, 100 parts, 101 parts or 105 parts; And / or, the glass fiber is an alkali-free glass fiber; the tensile strength of the alkali-free glass fiber is preferably 6.3-6.9 g / d; the wet state of the alkali-free glass fiber is preferably 5.4-5.8 g / d; And / or, the content of the glass fiber is 10-20 parts, such as 10 parts, 15 parts or 20 parts; And / or, the density of the oxidized polyethylene is 0.97-1g / cm 3 ; And / or, the viscosity of the oxidized polyethylene is 11000-22000cps; and / or, the acid value of the oxidized polyethylene is 16-22 mg KOH / g; And / or, the bulk density of the oxidized polyethylene is 500-700 kg / m 3 ; And / or, the melting point of the oxidized polyethylene is 120-140°C; and / or, the content of the oxidized polyethylene is 0.1-0.5 parts, such as 0.1, 0.3 or 0.4 parts; And / or, the acrylate is hydroxypropyl acrylate; And / or, the content of the acrylic acid ester is 5-6 parts, such as 5 or 6 parts.

3. The modified PET material according to claim 1, It is characterized in that The type of the plasticizer is styrene butadiene rubber and / or natural rubber; when styrene butadiene rubber and natural rubber are used as plasticizers, the mass ratio of the styrene butadiene rubber to the natural rubber is preferably 1:(1-1.2), for example 1:1; And / or, the content of the plasticizer is 1-2 parts, such as 1 part or 2 parts; and / or, the enhancer is a DH-1 enhancer; And / or, the content of the enhancer is 1-2 parts, such as 1 part or 2 parts; and / or, the component further comprises a lubricant and / or a pigment; Wherein, the type of the lubricant is preferably ethylene bisoleamide and / or hydrocarbon wax, more preferably ethylene bisoleamide; the content of the lubricant is preferably 0.3-0.7 parts; Among them, the type of the pigment is preferably toner and / or titanium dioxide; the content of the pigment is preferably 3-8 parts; the toner is preferably 2-3 parts; and the titanium dioxide is preferably 1-5 parts.

4. The modified PET material according to claim 2, It is characterized in that The preparation method of the PET resin is as follows: the recycled PET bottles are converted into terephthalic acid and ethylene glycol by hydrogenation cracking, and then the terephthalic acid and ethylene glycol are esterified to synthesize dihydroxyethyl terephthalate, and then polycondensed to obtain the PET resin; In the process of hydrocracking, a tridentate pincer ruthenium catalyst RuPNN(CO)H can be used; the temperature is preferably 150-170°C; H 2 The pressure is preferably 52-56 bar; Wherein, in the polycondensation reaction, magnesium acetate catalyst can be used; Preferably, the PET resin is prepared by the method of Example 1 of JP4080720B2.

5. The modified PET material according to claim 1, It is characterized in that The friction resistance of the modified PET material is 0.0071-0.0082N; And / or, the density of the modified PET material is 1.53-1.54 g / m 3 ; And / or, the diameter of the modified PET material is 6-10 mm, preferably 7-9 mm; for example, the modified PET material is a PET fiber wire with a diameter of 8 mm.

6. A method for preparing the modified PET material as claimed in any one of claims 1 to 5, It is characterized in that The preparation method comprises the following steps: melting the PET resin, adding the remaining components, stirring, and extruding to form granules.

7. The method for preparing the modified PET material according to claim 6, It is characterized in that The melting temperature is 240-280°C, for example 260°C; and / or, the stirring temperature is 190-230°C, preferably 200-220°C, for example 210°C; And / or, the stirring rate is 1000-1500 r / min, for example 1300 r / min; And / or, the stirring time is 20-30 min, for example 25 min; And / or, after the stirring and before the extrusion granulation, a cooling operation is also included; the cooling temperature is preferably 60-80° C.; And / or, during the extrusion granulation, the diameter of the extruder is 6-10 mm, preferably 7-9 mm, such as 8 mm.

8. A water conduit, It is characterized in that It comprises the modified PET material as claimed in any one of claims 1 to 5.

9. The water conduit according to claim 8, It is characterized in that The water conduit is made by weaving modified PET material; Preferably, the braided mesh is braided using 12-18 braiding heads, for example, 12 braiding heads are used; And / or, the water conduit is a special water conduit for bridge deck pavement; wherein, the bridge deck may be an elevated cement concrete bridge deck; and / or, the mass of the modified PET material is 48-154 g, preferably 84-87 g; And / or, the diameter of the modified PET material is 10-30 mm.

10. Use of the water conduit as claimed in claim 8 or 9 in bridge deck paving.

Images