Composition for preparing scale-inhibiting and antibacterial PE-RT pipe, preparation method of composition, scale-inhibiting and antibacterial PE-RT pipe product and preparation method of scale-inhibiting and antibacterial PE-RT pipe product

Abstract

The invention discloses a composition for preparing a scale-inhibiting and antibacterial PE-RT pipe, a preparation method of the composition, a scale-inhibiting and antibacterial PE-RT pipe product and a preparation method of the scale-inhibiting and antibacterial PE-RT pipe product. The composition comprises PE-RT resin, antibacterial master batch, brightener master batch, a beta nucleating agent, maleic anhydride grafted polyethylene and LLDPE resin. By adding the antibacterial master batch, the brightener master batch, the beta nucleating agent, the maleic anhydride grafted polyethylene and the LLDPE, synergistic interaction is achieved, the density of the PE-RT resin is effectively reduced, a protective layer similar to an oil film is formed on the surface of a pipe product prepared from the composition for preparing the scale-inhibiting and antibacterial PE-RT pipe, the service life of the pipe product is prolonged, the service life of the pipe product is prolonged, and the service life of the pipe product is prolonged. And the PE-RT pipe product which is high in hydrophobicity and excellent in performance and has antibacterial and scale-inhibiting effects is obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of PE-RT pipe processing, and more particularly relates to a composition for preparing scale-resistant and antibacterial PE-RT pipe, a preparation method thereof, and a scale-resistant and antibacterial PE-RT pipe product and a preparation method thereof. BACKGROUND

[0002] As a plastic pipe, heat-resistant polyethylene has good stability, corrosion resistance, reliable connection, energy saving, simple installation and convenient construction compared with traditional metal pipes such as steel pipes and iron pipes, and can meet various requirements of floor heating system internal pipes. Therefore, it is inevitable that heat-resistant polyethylene pipes will be widely used in urban heating projects in the future, and it is necessary and practical to study the performance and processing technology of heat-resistant polyethylene pipes. Since the hot water supply source of PE-RT (heat-resistant polyethylene) pipes is complex, dirt is easily adhered to the inner wall, and bacteria are easily adhered to the bare and exposed parts due to long-term oxidation, which affects the service life and pipeline transportation effect of PE-RT pipes.

[0003] Therefore, it is necessary to develop a scale-resistant and antibacterial PE-RT pipe material. SUMMARY

[0004] The purpose of the present application is to provide a composition for preparing scale-resistant and antibacterial PE-RT pipe, a preparation method thereof, and a scale-resistant and antibacterial PE-RT pipe product and a preparation method thereof. The scale-resistant and antibacterial PE-RT pipe prepared by the present application has excellent scale-resistant and antibacterial effect.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a composition for preparing scale-resistant and antibacterial PE-RT pipe, which comprises: PE-RT resin, antibacterial masterbatch, brightener masterbatch, beta nucleating agent, maleic anhydride grafted polyethylene and LLDPE resin.

[0006] In the present application, PE-RT resin and LLDPE resin are the same polar material, and the mixing of LLDPE does not cause compatibility problems. At the same time, since LLDPE contains more ethylene components and has a density much lower than PE-RT, the density of the product is lower than water after blending modification, so it has a certain hydrophobic effect.

[0007] In the present application, beta nucleating agent and maleic anhydride improve the crystallization rate and crystallinity of PE-RT pipe material to form fine and dense spherulitic particles, so that the molecular chain has a very fast crystallization rate at a higher temperature, and the spherulites can grow relatively regularly, the number is large and the size is small, thereby further improving the crystallinity and performance stability of PE-RT pipe material on the basis of PE-RT and LLDPE blending.

[0008] In the present application, the LLDPE itself has excellent high-temperature and low-temperature resistance and good flexibility. When the LLDPE is blended with the PE-RT, the antibacterial master batch and the brightener master batch, the LLDPE has high molecular structure fusion degree with each component and good compatibility, and cooperates with each component, so that a protective layer similar to an oil film is formed on the surface of the product, water droplets are not easy to adhere to the wall, and a certain spectrum antibacterial effect is obtained.

[0009] According to the present application, preferably, the amount of the antibacterial master batch is 1-3 parts by weight, the amount of the brightener master batch is 2-6 parts by weight, the amount of the beta nucleating agent is 0.05-0.3 parts by weight, the amount of the maleic anhydride grafted polyethylene is 0.05-1 parts by weight, preferably 0.05-0.3 parts by weight, and the amount of the LLDPE resin is 10-20 parts by weight, relative to 100 parts by weight of the PE-RT resin.

[0010] According to the present application, preferably, the heat resistance temperature of the PE-RT resin is greater than or equal to 80 DEG C.

[0011] In the present application, the PE-RT resin is a linear medium-density ethylene copolymer prepared by metallocene catalysis copolymerization of monomers of ethylene and octene, and the heat resistance temperature is greater than or equal to 80 DEG C.

[0012] In the present application, preferably, the PE-RT resin is LG SP980 and / or Lanzhou Petrochemical 3010.

[0013] According to the present application, preferably, the antibacterial master batch is a nano-silver ion antibacterial master batch prepared by taking PE as a base material.

[0014] In the present application, preferably, the antibacterial master batch is Guangdong Huixin HX-HDPE general type.

[0015] According to the present application, preferably, the brightener master batch is an amide brightener master batch for PE material.

[0016] Preferably, the melting point of the brightener master batch is 130-145 DEG C, and the brightener master batch contains ethylene bis-stearamide.

[0017] In the present application, preferably, the brightener master batch is Constapal PA0835HD-D.

[0018] In the present application, preferably, the beta nucleating agent is Weilinna WBG-II and / or Shanxi Chemical Research Institute TMB-5.

[0019] In the present application, preferably, the maleic anhydride grafted polyethylene is Dow Chemical TY1053H.

[0020] The second aspect of the present application provides a preparation method of the composition, which comprises: uniformly mixing the PE-RT resin, the antibacterial master batch, the brightener master batch, the beta nucleating agent, the maleic anhydride grafted polyethylene and the LLDPE resin to obtain the preparation composition for the scale-inhibiting and antibacterial PE-RT pipe.

[0021] The third aspect of the present application provides a scale-inhibiting and antibacterial PE-RT pipe product prepared from the composition.

[0022] The fourth aspect of the present application provides a preparation method of the scale-inhibiting and antibacterial PE-RT pipe product, which comprises:

[0023] (1) performing forming processing on the composition to obtain a blank, and then performing cooling setting to obtain a PE-RT pipe product to be treated;

[0024] (2) aging the PE-RT pipe product to be treated at 15-20℃ for not less than 24h, preferably 24-60h to obtain the scale-inhibiting and antibacterial PE-RT pipe product.

[0025] In the present application, preferably, the step (2) is aging the PE-RT pipe product to be treated at 20℃ for 24-48h to obtain the scale-inhibiting and antibacterial PE-RT pipe product.

[0026] In the present application, during the preparation process, after the composition for the scale-inhibiting and antibacterial PE-RT pipe is formed and cooled, aging treatment at 15-23℃ is performed, which can effectively reduce the intermolecular tension of each component in the PE-RT pipe material and enhance the stability of the crystalline structure.

[0027] According to the present application, preferably, in the step (1), the forming processing is extrusion forming or injection molding;

[0028] Preferably, the forming processing is extrusion forming, and the extrusion forming is performed using a single-screw extruder, wherein the length of the straight setting section of the die and the mandrel in the single-screw extruder is 50-100mm.

[0029] Further preferably, the barrel temperature of the single-screw extruder is 180-210℃, the temperature of the converging core is 160-180℃, and the mold temperature is 180-210℃.

[0030] In the present application, through the structural improvement of the screw and the mold, the setting length is enhanced, the melt outlet mold pressure is improved, the crystallization ability of the PE-RT pipe material is effectively enhanced, and the compactness and fusion effect of the PE-RT pipe product during the processing are strengthened.

[0031] According to the application, preferably, in step (1), the cooling and setting is vacuum cooling and setting; the vacuum degree during cooling is -0.02 to -0.06 MPa, and the temperature during cooling is 15 to 23 DEG C.

[0032] The technical scheme of the application has the following beneficial effects:

[0033] (1) The application synergistically reduces the density of PE-RT resin by adding antibacterial master batch, brightener master batch, beta nucleating agent, maleic anhydride grafted polyethylene and LLDPE, and the pipe product prepared from the composition for preparing scale and bacteria resistant PE-RT pipe according to the application forms a protective layer similar to an oil film on the surface of the product, thereby obtaining a PE-RT pipe product with strong hydrophobicity, excellent performance, scale and bacteria resistance.

[0034] (2) The scale and bacteria resistant PE-RT pipe product according to the application effectively reduces the intermolecular tension of each component in the PE-RT pipe material by long time aging treatment at a low temperature, thereby enhancing the stability of the crystalline structure and further improving the performance stability of the PE-RT pipe product and the hydrophobic effect of the surface oil film.

[0035] Other features and advantages of the application will be described in detail in the following specific embodiments. DETAILED DESCRIPTION

[0036] The preferred embodiments of the application will be described in more detail below. Although the preferred embodiments of the application are described below, it should be understood that the application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the application more thorough and complete, and to fully convey the scope of the application to those skilled in the art.

[0037] The application will be further illustrated by the following examples:

[0038] In the following examples and comparative examples:

[0039] The raw materials in the examples and comparative examples can be obtained from the market, wherein:

[0040] The heat resistance temperature of the PE-RT resin is greater than or equal to 80 DEG C, and the specific is SP980, LG Chemical;

[0041] The antibacterial master batch is a nano silver ion antibacterial master batch prepared from PE as a base material, and the specific is HX-HDPE universal type, Guangdong Huixin;

[0042] The brightener master batch is a PE material ethylene bis-stearamide brightener master batch, and the melting point of the brightener master batch is 135.6 DEG C, and the specific is PA0835HD-D, Kangsantapu;

[0043] Beta nucleating agent is WBG-II, Weilinna;

[0044] Maleic anhydride grafted polyethylene is TY1053H, Dow Chemical;

[0045] LLDPE resin is 7042, Guangzhou Petrochemical;

[0046] LDPE resin is Q280 of Shanghai Petrochemical;

[0047] Unless otherwise specified, the reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field.

[0048] Examples 1-5

[0049] The present embodiment provides a composition for preparing scale and bacteria resistant PE-RT pipe, and the specific formula is shown in Table 1.

[0050] The specific preparation method is as follows: the PE-RT resin, antibacterial master batch, brightener master batch, beta nucleating agent, maleic anhydride grafted polyethylene and LLDPE resin are uniformly mixed to obtain the composition for preparing scale and bacteria resistant PE-RT pipe.

[0051] Table 1 Component content (parts by weight) of the composition for preparing scale and bacteria resistant PE-RT pipe in Examples 1-5

[0052]

[0053]

[0054] Comparative Example 1

[0055] The difference between the formula of the present comparative example and Example 1 is only that the brightener master batch is removed, and the LLDPE resin is adjusted to 13 parts by weight;

[0056] The specific preparation method is as follows: the PE-RT resin, antibacterial master batch, beta nucleating agent, maleic anhydride grafted polyethylene and LLDPE resin are uniformly mixed to obtain the composition for preparing PE-RT pipe.

[0057] Comparative Example 2

[0058] The difference between the formula of the present comparative example and Example 1 is only that 10 parts by weight of LLDPE resin is replaced by 10 parts by weight of LDPE resin;

[0059] The specific preparation method is as follows: the PE-RT resin, antibacterial master batch, brightener master batch, beta nucleating agent, maleic anhydride grafted polyethylene and LDPE resin are uniformly mixed to obtain the composition for preparing PE-RT pipe.

[0060] Examples 6-10

[0061] The present embodiment provides a scale and bacteria resistant PE-RT pipe product, which is prepared by using the scale and bacteria resistant PE-RT pipe composition prepared in Examples 1-5, respectively, and the specific preparation method is as follows:

[0062] S1. The corresponding scale and bacteria resistant PE-RT pipe composition is extruded by a single screw extruder to obtain a blank, and then the blank is cooled and shaped to obtain a PE-RT pipe product to be treated;

[0063] The front section of the single screw extruder adopts a hole type screw extrusion, and the length of the flat shaping section of the die mouth and the mandrel of the single screw extruder is 80 mm;

[0064] The temperature of each section of the barrel of the single screw extruder is 180°C, the temperature of the converging core is 170°C, and the temperature of each section of the die is 190°C;

[0065] The cooling and shaping is vacuum cooling and shaping, and the vacuum degree during cooling is -0.04 MPa, and the cooling temperature is 18°C;

[0066] S2. The PE-RT pipe product to be treated obtained in step S1 is aged at 20°C for 24 h to obtain a PE-RT pipe product; the outer diameter of the PE-RT pipe product is 20.00-20.24 mm, and the wall thickness is 2.05-2.2 mm.

[0067] Example 11

[0068] The scale and bacteria resistant PE-RT pipe product (i.e., the composition prepared in Example 1) is prepared according to the method of Example 6, and the only difference is that: step S2. The PE-RT pipe product to be treated obtained in step S1 is aged at 20°C for 48 h to obtain a PE-RT pipe product; the outer diameter of the PE-RT pipe product is 20.00-20.24 mm, and the wall thickness is 2.05-2.2 mm.

[0069] Example 12

[0070] The scale and bacteria resistant PE-RT pipe product (i.e., the composition prepared in Example 1) is prepared according to the method of Example 6, and the only difference is that: step S2. The PE-RT pipe product to be treated obtained in step S1 is aged at 20°C for 60 h to obtain a PE-RT pipe product; the outer diameter of the PE-RT pipe product is 20.00-20.24 mm, and the wall thickness is 2.05-2.2 mm.

[0071] Example 13

[0072] The scale-inhibiting and antibacterial PE-RT pipe product was prepared according to the method of Example 6 (i.e., the composition prepared in Example 1 was used), with the exception that the single-screw extruder front section was extruded using a hole screw, the flat shaping section length of the die mouth of the single-screw extruder and the mandrel was 30 mm; the outer diameter of the prepared PE-RT pipe was 20.00-20.24 mm, and the wall thickness was 2.05-2.2 mm.

[0073] Example 14

[0074] The scale-inhibiting and antibacterial PE-RT pipe product was prepared according to the method of Example 6 (i.e., the composition prepared in Example 1 was used), with the exception that the single-screw extruder front section was extruded using a hole screw, the flat shaping section length of the die mouth of the single-screw extruder and the mandrel was 30 mm; the outer diameter of the prepared PE-RT pipe was 20.00-20.24 mm, and the wall thickness was 2.05-2.2 mm.

[0075] Example 15

[0076] The scale-inhibiting and antibacterial PE-RT pipe product was prepared according to the method of Example 6 (i.e., the composition prepared in Example 1 was used), with the exception that the single-screw extruder front section was extruded using a hole screw, the flat shaping section length of the die mouth of the single-screw extruder and the mandrel was 30 mm; the outer diameter of the prepared PE-RT pipe was 20.00-20.24 mm, and the wall thickness was 2.05-2.2 mm.

[0077] Comparative Example 3

[0078] This comparative example provides a PE-RT pipe product, and the specific preparation method is as follows:

[0079] The PE-RT pipe product was prepared according to the method of Example 6, with the exception that the PE-RT pipe composition prepared in Comparative Example 1 was used; the outer diameter of the prepared PE-RT pipe was 20.00-20.24 mm, and the wall thickness was 2.05-2.2 mm.

[0080] Comparative Example 4

[0081] This comparative example provides a PE-RT pipe product, and the specific preparation method is as follows:

[0082] The PE-RT pipe product was prepared according to the method of Example 6, with the exception that the PE-RT pipe composition prepared in Comparative Example 2 was used; the outer diameter of the prepared PE-RT pipe was 20.00-20.24 mm, and the wall thickness was 2.05-2.2 mm.

[0083] Test Example

[0084] The PE-RT pipe products prepared in the above examples and comparative examples were tested for performance, and the specific test methods and test results are shown in the following table.

[0085] Table 2 Test Methods

[0086]

[0087] Table 3 test results

[0088]

[0089]

[0090] In Table 3, in the results of the simply supported beam impact test, the number before " / " represents the number of breakage, and the number 20 after " / " represents the total number of tests.

[0091] According to the test results in Table 3, the PE-RT pipe products prepared according to the technical solutions of the present application all have good physical properties, hydrophobicity and antibacterial properties.

[0092] The composition used in Comparative Example 3 lacks brightener masterbatch, resulting in poor hydrophobicity; the composition used in Comparative Example 4 replaces LLDPE with LDPE, and the breakage rate of the simply supported beam impact is high, which cannot meet the use requirements. Examples 14-15, the aging temperature of the PE-RT pipe products is too short or the products are not aged, which have certain effects on the hydrophobicity and physical properties of the products.

[0093] The above has described various embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A composition for preparing a scale and bacteria resistant PE-RT pipe, characterized in that, The composition comprises: PE-RT resin, antibacterial masterbatch, brightener masterbatch, β-nucleating agent, maleic anhydride-grafted polyethylene, and LLDPE resin.

2. The composition of claim 1, wherein, Relative to 100 parts by weight of PE-RT resin, the amount of antibacterial masterbatch is 1-3 parts by weight, the amount of brightener masterbatch is 2-6 parts by weight, the amount of β-nucleating agent is 0.05-0.3 parts by weight, the amount of maleic anhydride grafted polyethylene is 0.05-1 parts by weight, preferably 0.05-0.3 parts by weight, and the amount of LLDPE resin is 10-20 parts by weight.

3. The composition according to claim 1 or 2, wherein, The heat resistance temperature of the PE-RT resin is ≥80℃.

4. The composition according to claim 1 or 2, wherein, The antibacterial masterbatch is a nano-silver ion antibacterial masterbatch prepared with PE as the base material.

5. The composition according to claim 1 or 2, wherein, The brightener masterbatch is an amide-based brightener masterbatch for PE materials; Preferably, the brightener masterbatch has a melting point of 130-145°C and contains ethylene bis-stearamide.

6. A method for preparing the composition according to any one of claims 1-5, characterized in that, The preparation method includes: mixing the PE-RT resin, antibacterial masterbatch, brightener masterbatch, β-nucleating agent, maleic anhydride-grafted polyethylene and LLDPE resin evenly to obtain the scale-inhibiting and antibacterial PE-RT pipe composition.

7. A scale-inhibiting and antibacterial PE-RT pipe product, characterized in that, The PE-RT pipe product is made from the composition of any one of claims 1-5.

8. The method for preparing the scale-inhibiting and antibacterial PE-RT pipe product according to claim 7, characterized in that, The preparation method includes: (1) The composition according to any one of claims 1-5 is processed to obtain a blank, and then cooled and shaped to obtain the PE-RT pipe product to be processed; (2) The PE-RT pipe product to be treated is aged at 15-20℃ for no less than 24h, preferably 24-60h, to obtain the scale-inhibiting and antibacterial PE-RT pipe product.

9. The preparation method according to claim 8, wherein, In step (1), the molding process is either extrusion molding or injection molding; Preferably, the molding process is extrusion molding, which is performed using a single-screw extruder, wherein the length of the straight shaping section of the die and mandrel in the single-screw extruder is 50-100 mm; More preferably, the barrel temperature of the single-screw extruder is 180–210°C, the spool temperature is 160–180°C, and the die temperature is 180–210°C.

10. The preparation method according to claim 8, wherein, In step (1), the cooling and shaping is vacuum cooling and shaping; the vacuum degree during cooling is -0.02 to -0.06 MPa, and the cooling temperature is 15 to 23°C.

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