Anti-corrosion thermal insulation pipe fitting

Abstract

The application relates to the field of water supply and distribution pipelines, and particularly discloses an anti-corrosion heat-insulation pipe fitting. The anti-corrosion heat-insulation pipe fitting comprises a PPR pipe fitting layer located at an inner layer, a heat-insulation layer is arranged outside the PPR pipe fitting layer, and a protective layer is arranged outside the heat-insulation layer. The PPR pipe fitting layer is made of the following raw materials in parts by weight: PPR master batch 80-90 parts, antibacterial component 10-20 parts, wherein the antibacterial component comprises an impact modifier, an antibacterial load agent and a crystallization promoter, and the weight ratio of the impact modifier, the antibacterial load agent and the crystallization promoter is 4-9:3-6:3. The anti-corrosion heat-insulation pipe fitting can be used in water supply and distribution pipelines, and has the advantages of reducing bacterial reproduction and reducing pollution to water.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water supply and distribution pipes, more particularly, it relates to an anti-corrosion heat preservation pipe fitting. BACKGROUND

[0002] Water supply and distribution pipes are an important link between water supply units and end users, and the health and safety of pipe fittings are the guarantee of safe and high-quality drinking water. Metal, plastic and other water supply and distribution equipment have certain effects on sensory indicators, metal indicators, organic indicators and microbial indicators of drinking water during use.

[0003] Due to the high price of high-quality stainless steel pipe fittings, they are only used in high-end residential areas and hotel water supply pipes in China, so PPR pipe fittings are commonly used in water supply pipes in China.

[0004] When the user stops using water or the water usage is small, the drinking water often stays in the pipe for a long time, and bacteria and other microorganisms in nature can almost attach to all solid surfaces in contact with water to grow. At this time, the microorganisms in the water pipe attach to the pipe wall to form a biofilm, which can provide conditions for the reproduction of microorganisms; the shedding of the biofilm can also worsen the water quality, causing an increase in the color, turbidity and bacterial count of drinking water, directly threatening human health. SUMMARY

[0005] In order to improve the antibacterial performance of water supply and distribution pipe fittings and reduce the generation of biofilm on the pipe wall, thereby reducing the pollution of the water in the pipe, the present application provides an anti-corrosion heat preservation pipe fitting.

[0006] The following technical scheme is adopted:

[0007] An anti-corrosion heat preservation pipe fitting, comprising a PPR pipe fitting layer located in an inner layer, a heat preservation layer is sleeved outside the PPR pipe fitting layer, and a protective layer is sleeved outside the heat preservation layer, the PPR pipe fitting layer is made of the following raw materials by weight: PPR master batch 80-90 parts, antibacterial component 10-20 parts, the antibacterial component includes impact modifier, antibacterial load and crystallization promoter, the weight ratio of the impact modifier, the antibacterial load and the crystallization promoter is 4-9:3-6:3.

[0008] By adopting the above technical scheme, since the crystallization promoter promotes the crystallization of PPR, the bonding strength of the impact modifier and the antibacterial load on the PPR is enhanced, so that the components are more closely combined, when the water flow erodes, the impact modifier makes the antibacterial load not easy to fall off, so that the antibacterial load continuously releases silver ions in the water pipe, reduces the reproduction of bacteria, and further reduces the pollution of the water in the pipe.

[0009] Preferably, the impact modifier is a quaternary phosphonium salt polymer antibacterial agent covered with a connecting layer.

[0010] By adopting the technical scheme, when the water flow continuously erodes the water pipe, silver ions of the antibacterial load agent are continuously released, the surface connection layer of the impact resistance modifier protects the quaternary phosphonium salt polymer antibacterial agent in the inner layer, the binding strength of the quaternary phosphonium salt polymer antibacterial agent in the inner layer with PPR and other components is increased, the quaternary phosphonium salt polymer antibacterial agent is stably combined in the PPR pipe fitting and simultaneously plays an antibacterial role, and the possibility of bacterial reproduction is further reduced.

[0011] Preferably, the impact resistance modifier is prepared by the following steps: S1, preparing an antibacterial inner core; S2, preparing a connection layer shell; and S3, condensation and drying.

[0012] By adopting the technical scheme, the antibacterial inner core is first prepared, and then the connection layer shell which plays a connecting role is added to the surface of the inner shell, on the one hand, the binding strength of the impact resistance modifier with other components is increased, and on the other hand, the antibacterial inner core is not easily eroded and lost when being in contact with the external water flow, thereby continuously playing an antibacterial role and effectively reducing the pollution of water by bacterial reproduction.

[0013] Preferably, the specific steps for preparing the antibacterial inner core are as follows: chlorinated rubber is dissolved in N,N-dimethylformamide, an organic phosphine N,N-dimethylformamide solution is added, reflux reaction is carried out in a nitrogen environment, after the reaction, the excess product is filtered off, distilled water and an emulsifier are mixed, the product solution is added to the mixture, and stirring is carried out to prepare an antibacterial modified chlorinated rubber emulsion.

[0014] By adopting the technical scheme, the organic phosphine which plays an antibacterial role is loaded on the chlorinated rubber, thereby preparing the chlorinated rubber which has antibacterial performance, and the corresponding emulsion is prepared by emulsification to generate latex particles, which is convenient for the growth of the shell in the later period.

[0015] Preferably, the specific steps for preparing the connection layer shell are as follows: a butyl acrylate pre-emulsion is first prepared, then the pre-emulsion is added dropwise into the antibacterial modified chlorinated rubber emulsion, the temperature is raised to 75 DEG C in a nitrogen atmosphere, and an initiator is added to prepare a grafted emulsion.

[0016] By adopting the technical scheme, the butyl acrylate pre-emulsion which serves as a shell emulsion is added dropwise into the antibacterial modified chlorinated rubber emulsion which serves as a core emulsion, and the shell is formed through the initiation of an initiator, thereby preparing the corresponding core-shell structure.

[0017] Preferably, the specific steps for condensation and drying are as follows: the grafted emulsion is added into a magnesium sulfate solution for condensation, when the liquid is clear, the powder particles are obtained by filtration, and the powder particles are dried to prepare the impact resistance modifier.

[0018] By adopting the technical scheme, the core-shell solution is coagulated in the magnesium sulfate solution, so that the corresponding powder particles are formed, and the impact modifier is more easily integrated into the PPR pipe fitting.

[0019] Preferably, the antibacterial carrier is prepared by the following steps: S1, composite carrier preparation: mixing the organic intercalated montmorillonite and mullite fibers, soaking in aniline solution, washing with distilled water after centrifugation and drying, placing the dried mixture in hydrochloric acid solution and stirring, then adding ammonium persulfate to initiate, adding ammonia to adjust the pH to 7, then centrifuging, washing with distilled water and vacuum drying to obtain the composite carrier; S2, antibacterial loading: placing the composite carrier in silver nitrate solution, soaking and stirring, then centrifuging, washing with distilled water and vacuum drying to obtain the antibacterial carrier.

[0020] By adopting the technical scheme, the organic intercalated montmorillonite is combined with the mullite fibers by aniline growth, so that the corresponding composite carrier is prepared. The composite carrier has strong silver ion adsorption capacity and can store a large amount of silver ions. On the other hand, the antibacterial carrier is combined with the PPR through the mullite fibers, so that the bonding strength of the antibacterial carrier in the PPR is improved, and the loss of silver ions is reduced.

[0021] Preferably, the heat preservation layer is a polyethylene foaming layer, which is prepared from the following raw materials in the following proportions by weight: polyethylene 20-40 parts, polypropylene 8-12 parts, filler 1-10 parts, foaming agent 0.1-0.3 parts, foaming promoter 0.5-1.0 parts, bridging agent 0.5-1 part, and lubricant 0.1-0.5 part.

[0022] By adopting the technical scheme, the combination of the above-mentioned raw materials can obtain a polyethylene foaming layer, which can provide the function of heat preservation, so that the water pipe can maintain warmth during water transportation and distribution, reducing the possibility of water freezing.

[0023] Preferably, the protective layer is a polyolefin elastomer layer, which is prepared from the following raw materials in the following proportions by weight: polyolefin elastomer 40-50 parts, polyethylene 30-50 parts, titanium dioxide 8-10 parts, and clay 3-5 parts.

[0024] By adopting the technical scheme, the polyolefin elastomer and polyethylene are reinforced by titanium dioxide and clay, so that their strength is improved, thereby providing protection to the outermost layer and reducing damage to the inner layer of the pipe fitting and corrosion damage from the outside.

[0025] Preferably, the preparation process of the corrosion-resistant heat preservation pipe fitting comprises the following steps: injection molding the PPR layer, injection molding the heat preservation layer on the outer layer of the PPR layer after the injection molding is completed, and finally injection molding the protective layer on the outer layer of the heat preservation layer to complete the preparation of the corrosion-resistant heat preservation pipe fitting.

[0026] By adopting the technical scheme, the PPR layer, the heat preservation layer and the protection layer are sequentially injection molded, the three-layer pipe fitting is prepared through layer-by-layer injection molding, and thus the corrosion-resistant heat preservation water distribution pipe fitting is prepared.

[0027] To sum up, the application has the following beneficial effects:

[0028] 1. Since the crystallization of PPR is promoted by the crystallization promoter, the bonding strength between the impact resistance modifier and the antibacterial carrier is enhanced due to the crystallization of PPR, the impact resistance modifier makes the antibacterial carrier not easy to be washed away by water flow, and thus the quaternary phosphonium salt polymer antibacterial agent in the impact resistance modifier continuously resists bacteria.

[0029] 2. In the application, the quaternary phosphonium salt polymer antibacterial agent is used as the inner core layer component, and the butyl acrylate component as the outer shell layer component effectively improves the compatibility of the quaternary phosphonium salt polymer antibacterial agent in PPR, enhances the bonding strength between the impact resistance modifier and other raw materials, and makes the PPR more stable as a whole.

[0030] 3. In the application, the core-shell structure of the impact resistance modifier protects the quaternary phosphonium salt polymer antibacterial agent in the core layer and makes it easier to combine with the antibacterial carrier and PPR material, and the crystallization promoter promotes the crystallization of PPR, making the PPR more compact as a whole, so as to tightly fix the antibacterial carrier and the impact resistance modifier in PPR, and the antibacterial carrier and the impact resistance modifier are difficult to be eroded by water flow, reducing the loss of the antibacterial carrier and the impact resistance modifier during the water flow erosion process. DETAILED DESCRIPTION

[0031] In the application, the preparation method of the organic intercalation montmorillonite is as follows: 80 g of sodium-based montmorillonite is mixed with 8 g of hexadecyl trimethyl ammonium bromide, 200 mL of water is added, 70℃ water bath heating and stirring for 2 h, stirring speed 60 r / min, centrifugal and washing, suction filtration, and then 80℃ drying for 24 h, grinding and sieving, and 500 mesh organic intercalation montmorillonite is taken for standby. The PPR master batch is a PPR pipeline master batch. The crystallization promoter is a rare earth β nucleating agent, model WBG-M. The effective content of chlorinated rubber is 99%. The effective content of tributyl phosphine is 98%. The initiator is potassium persulfate. The mullite fiber specification is 5 microns in diameter and 100 microns in length. The particle size of the clay is 400 mesh, and the montmorillonite content is 60%, which is purchased from Si Shui County Yue Xin Metallurgical and Foundry Material Factory.

[0032] The application will be further described in detail in combination with the following examples.

[0033] Preparation Example

[0034] Preparation Example of Impact Resistance Modifier

[0035] Preparation Example 1

[0036] The present preparation example discloses an impact modifier prepared by the following steps:

[0037] S1, preparation of antibacterial core: 5g of chlorinated rubber is dissolved in 100ml of N, N-dimethylformamide to prepare a base solution, 2.5g of tributylphosphonium chloride is dissolved in 20ml of N, N-dimethylformamide and then added dropwise to the base solution at a rate of 2ml / min, the reaction temperature is 75℃, and the reaction is carried out under reflux for 24h in a nitrogen environment, after the reaction, the excess product is filtered out, distilled water and sodium dodecyl sulfate are mixed according to a weight ratio of 9:1, the product solution is added to the mixture, the volume ratio of the product solution to distilled water is 1:1, and the mixture is stirred to prepare an antibacterial modified chlorinated rubber emulsion, i.e., a chlorinated tributylphosphonium rubber emulsion;

[0038] S2, preparation of connection layer shell: butyl acrylate and 20% ammonia water are mixed according to a weight ratio of 1:2, 1% dimethyl acrylate of the weight of butyl acrylate and 5% sodium dodecyl sulfate of the weight of ammonia water are added, and the mixture is stirred for 1h to prepare a butyl acrylate pre-emulsion, the butyl acrylate pre-emulsion is added dropwise to the antibacterial modified chlorinated rubber emulsion while stirring, the dropping rate is 5ml / min, the stirring speed is 50r / min, the temperature is raised to 75℃ in a nitrogen atmosphere, potassium persulfate is added after the dropwise addition is completed, the amount of potassium persulfate used is 0.25% of the weight of butyl acrylate, and the grafting emulsion is prepared after 3h of reaction;

[0039] S3, coagulation and drying: the grafting emulsion is continuously and slowly added to a 5% magnesium sulfate solution in a thin stream under stirring to coagulate, the stirring speed is 40r / min, and the volume ratio of the grafting emulsion to the magnesium sulfate solution is 1:5, the powder particles are obtained by filtering when the liquid is clear, and the 200-mesh powder particles are dried at 80℃ and screened as the impact modifier.

[0040] Preparation example of antibacterial support agent

[0041] Preparation example 2

[0042] The present preparation example discloses an antibacterial support agent prepared by the following steps:

[0043] S1, preparation of composite carrier: organic intercalated montmorillonite and mullite fibers are mixed according to a mass ratio of 1:1, soaked in a 1% aniline solution for 24h, washed with water after centrifugation and dried at 80℃, 2kg of the dried mixture is placed in a 2L 1% hydrochloric acid solution, stirred for 2h, then 0.5kg of ammonium persulfate is added, heated at 75℃ for 4h, and the pH is adjusted to 7 by adding 1.0mol / L ammonia water, then centrifuged, washed with distilled water and vacuum dried to prepare the composite carrier;

[0044] S2, antibacterial loading: 2 kg of the composite carrier was placed in 5 L of silver nitrate solution with a concentration of 0.5 mol / L, soaked and stirred for 3 h at a stirring speed of 30 r / min, then centrifuged, washed with distilled water and vacuum dried to obtain the antibacterial loading agent.

[0045] Preparation Example 3

[0046] The preparation example discloses an antibacterial loading agent prepared by the following steps:

[0047] S1, composite carrier preparation: the organic intercalated montmorillonite was soaked in aniline solution with a mass fraction of 1% for 24 h, then washed with water after centrifugation and dried at 80°C, 2 kg of the dried mixture was placed in 2 L of hydrochloric acid solution with a mass fraction of 1% and stirred for 2 h, then 0.5 kg of ammonium persulfate was added, heated at 75°C for 4 h, ammonia water with a concentration of 1.0 mol / L was added to adjust the pH to 7, then centrifuged, washed with distilled water and vacuum dried to obtain the composite carrier;

[0048] S2, antibacterial loading: 2 kg of the composite carrier was placed in 5 L of silver nitrate solution with a concentration of 0.5 mol / L, soaked and stirred for 3 h at a stirring speed of 30 r / min, then centrifuged, washed with distilled water and vacuum dried to obtain the antibacterial loading agent.

[0049] Preparation Example 4

[0050] The preparation example discloses an antibacterial loading agent prepared by the following steps:

[0051] S1, composite carrier preparation: the organic intercalated montmorillonite was soaked in aniline solution with a mass fraction of 1% for 24 h, then washed with water after centrifugation and dried at 80°C, 2 kg of the dried mixture was placed in 2 L of hydrochloric acid solution with a mass fraction of 1% and stirred for 2 h, then 0.5 kg of ammonium persulfate was added, heated at 75°C for 4 h, ammonia water with a concentration of 1.0 mol / L was added to adjust the pH to 7, then centrifuged, washed with distilled water and vacuum dried to obtain the composite carrier;

[0052] S2, antibacterial loading: 2 kg of the composite carrier was placed in 5 L of silver nitrate solution with a concentration of 0.5 mol / L, soaked and stirred for 3 h at a stirring speed of 30 r / min, then centrifuged, washed with distilled water and vacuum dried to obtain the antibacterial loading agent.

[0053] PPR material preparation example

[0054] Preparation Example 5

[0055] The preparation example discloses a PPR material prepared by the following raw materials by weight:

[0056] PPR master batch 80 kg, impact modifier prepared in preparation example 1 4 kg, antibacterial loading agent prepared in preparation example 2 3 kg, crystallization promoter 3 kg.

[0057] Preparation Example 6

[0058] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0059] PPR master batch 90 kg, impact modifier prepared in Preparation Example 1 6.5 kg, antibacterial loading agent prepared in Preparation Example 2 4.5 kg, crystallization promoter 3 kg.

[0060] Preparation Example 7

[0061] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0062] PPR master batch 100 kg, impact modifier prepared in Preparation Example 1 9 kg, antibacterial loading agent prepared in Preparation Example 2 6 kg, crystallization promoter 3 kg.

[0063] Preparation Example 8

[0064] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0065] PPR master batch 90 kg, impact modifier prepared in Preparation Example 1 6.5 kg, antibacterial loading agent prepared in Preparation Example 3 4.5 kg, crystallization promoter 3 kg.

[0066] Preparation Example 9

[0067] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0068] PPR master batch 90 kg, impact modifier prepared in Preparation Example 1 6.5 kg, antibacterial loading agent prepared in Preparation Example 4 4.5 kg, crystallization promoter 3 kg.

[0069] Preparation Example 10

[0070] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0071] PPR master batch 93 kg, impact modifier prepared in Preparation Example 1 6.5 kg, antibacterial loading agent prepared in Preparation Example 2 4.5 kg.

[0072] Preparation Example 11

[0073] This preparation example discloses a PPR material prepared from the following raw materials by weight:

[0074] PPR master batch 94.5 kg, impact modifier prepared in Preparation Example 1 6.5 kg, crystallization promoter 3 kg.

[0075] Preparation Example 12

[0076] This Preparation Example discloses a PPR material prepared from the following raw materials by weight:

[0077] PPR masterbatch 96.5 kg, antibacterial loading agent prepared in Preparation Example 2 4.5 kg, crystallization promoter 3 kg.

[0078] Preparation Example 13

[0079] This Preparation Example discloses a PPR material prepared from the following raw materials by weight:

[0080] PPR masterbatch 97.5 kg, impact modifier prepared in Preparation Example 1 6.5 kg.

[0081] Preparation Example 14

[0082] This Preparation Example discloses a PPR material prepared from the following raw materials by weight:

[0083] PPR masterbatch 99.5 kg, antibacterial loading agent prepared in Preparation Example 2 4.5 kg.

[0084] Preparation Example 15

[0085] This Preparation Example discloses a PPR material prepared from the following raw materials by weight:

[0086] PPR masterbatch 101 kg, crystallization promoter 3 kg.

[0087] Polyethylene material preparation example

[0088] Preparation Example 16

[0089] This Preparation Example discloses a polyethylene material prepared from the following raw materials by weight:

[0090] Polyethylene masterbatch 20 kg, polypropylene masterbatch 8 kg, filler talc 1 kg, foaming agent AC-3000H 0.1 kg, foaming promoter zinc oxide powder 0.5 kg, bridging agent di-sec-octyl phthalate 0.5 kg, lubricant stearic acid 0.1 kg.

[0091] Preparation Example 17

[0092] This Preparation Example discloses a polyethylene material prepared from the following raw materials by weight:

[0093] Polyethylene masterbatch 30 kg, polypropylene masterbatch 10 kg, filler talc 5.5 kg, foaming agent AC-3000H 0.2 kg, foaming promoter zinc oxide powder 0.7 kg, bridging agent di-sec-octyl phthalate 0.7 kg, lubricant stearic acid 0.3 kg.

[0094] Preparation Example 18

[0095] The present preparation example discloses a polyethylene material prepared from the following raw materials by weight:

[0096] Polyethylene masterbatch 40 kg, polypropylene masterbatch 12 kg, filler talcum powder 10 kg, foaming agent AC-3000H 0.3 kg, foaming promoter zinc oxide powder 1.0 kg, bridging agent di-sec-octyl phthalate 1 kg, lubricant stearic acid 0.5 kg.

[0097] Preparation example of polyolefin elastomer material

[0098] Preparation example 19

[0099] The present preparation example discloses a polyolefin elastomer material prepared from the following raw materials by weight:

[0100] Polyolefin elastomer masterbatch 40 kg, polyethylene masterbatch 30 kg, titanium dioxide of rutile type with particle size of 2000 mesh 8 kg, clay 3 kg.

[0101] Preparation example 20

[0102] The present preparation example discloses a polyolefin elastomer material prepared from the following raw materials by weight:

[0103] Polyolefin elastomer masterbatch 45 kg, polyethylene masterbatch 40 kg, titanium dioxide of rutile type with particle size of 2000 mesh 9 kg, clay 4 kg.

[0104] Preparation example 21

[0105] The present preparation example discloses a polyolefin elastomer material prepared from the following raw materials by weight:

[0106] Polyolefin elastomer masterbatch 50 kg, polyethylene masterbatch 50 kg, titanium dioxide of rutile type with particle size of 2000 mesh 10 kg, clay 5 kg.

[0107] Example

[0108] Example 1

[0109] The present example discloses an anti-corrosion thermal insulation pipe fitting prepared from the following steps:

[0110] S1, install the PPR layer mold on the injection molding machine, and inject according to the formula provided in preparation example 5, dry at 90°C for 0.5h, then melt at 260°C for 2.5h, then inject the molten material into the mold, and cool to obtain a PPR pipe;

[0111] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 16 is injected, dried at 90℃ for 0.5h, then melted at 180℃ for 2.5h, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0112] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 19 is injected, dried at 90℃ for 0.5h, then melted at 150℃ for 2.5h, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0113] Example 2

[0114] The present embodiment discloses a kind of corrosion-resistant thermal insulation pipe fittings, which is prepared by the following steps:

[0115] S1, the mold of PPR layer is installed on the injection molding machine, the formula provided in Preparation Example 6 is injected, dried at 90℃ for 0.5h, then melted at 260℃ for 2.5h, then the molten material is injected into the mold, and cooled to obtain PPR pipe;

[0116] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 17 is injected, dried at 90℃ for 0.5h, then melted at 180℃ for 2.5h, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0117] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 20 is injected, dried at 90℃ for 0.5h, then melted at 150℃ for 2.5h, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0118] Example 3

[0119] The present embodiment discloses a kind of corrosion-resistant thermal insulation pipe fittings, which is prepared by the following steps:

[0120] S1, the mold of PPR layer is installed on the injection molding machine, the formula provided in Preparation Example 7 is injected, dried at 90℃ for 0.5h, then melted at 260℃ for 2.5h, then the molten material is injected into the mold, and cooled to obtain PPR pipe;

[0121] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 18 is used for injection molding, 90℃ drying for 0.5h, then 180℃ heating for 2.5h melting, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0122] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 21 is used for injection molding, 90℃ drying for 0.5h, then 150℃ heating for 2.5h melting, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0123] Example 4

[0124] The embodiment discloses a corrosion-resistant thermal insulation pipe fitting, which is prepared by the following steps:

[0125] S1, the mold of the PPR layer is installed on the injection molding machine, the formula provided in Preparation Example 8 is used for injection molding, 90℃ drying for 0.5h, then 260℃ heating for 2.5h melting, then the molten material is injected into the mold, and cooling to obtain the PPR pipe;

[0126] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 17 is used for injection molding, 90℃ drying for 0.5h, then 180℃ heating for 2.5h melting, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0127] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 20 is used for injection molding, 90℃ drying for 0.5h, then 150℃ heating for 2.5h melting, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0128] Example 5

[0129] The embodiment discloses a corrosion-resistant thermal insulation pipe fitting, which is prepared by the following steps:

[0130] S1, the mold of the PPR layer is installed on the injection molding machine, the formula provided in Preparation Example 9 is used for injection molding, 90℃ drying for 0.5h, then 260℃ heating for 2.5h melting, then the molten material is injected into the mold, and cooling to obtain the PPR pipe;

[0131] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in preparation example 17 is injected, 90 DEG C drying 0.5h, then 180 DEG C heating 2.5h melting, the PPR pipe injected in S1 is placed in the heat preservation layer mold, then the molten material is injected into the mold, and the PPR pipe coated with the heat preservation layer is obtained;

[0132] S3, the protective layer mold is installed on the injection molding machine, the formula provided in preparation example 20 is injected, 90 DEG C drying 0.5h, then 150 DEG C heating 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is placed in the protective layer mold, then the molten material is injected into the mold, and the corrosion-resistant heat preservation pipe fitting is obtained.

[0133] Comparative example

[0134] Comparative example 1

[0135] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0136] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in preparation example 10 is injected, 90 DEG C drying 0.5h, then 260 DEG C heating 2.5h melting, then the molten material is injected into the mold, and the PPR pipe is obtained by cooling;

[0137] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in preparation example 17 is injected, 90 DEG C drying 0.5h, then 180 DEG C heating 2.5h melting, the PPR pipe injected in S1 is placed in the heat preservation layer mold, then the molten material is injected into the mold, and the PPR pipe coated with the heat preservation layer is obtained;

[0138] S3, the protective layer mold is installed on the injection molding machine, the formula provided in preparation example 20 is injected, 90 DEG C drying 0.5h, then 150 DEG C heating 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is placed in the protective layer mold, then the molten material is injected into the mold, and the corrosion-resistant heat preservation pipe fitting is obtained.

[0139] Comparative example 2

[0140] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0141] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in preparation example 11 is injected, 90 DEG C drying 0.5h, then 260 DEG C heating 2.5h melting, then the molten material is injected into the mold, and the PPR pipe is obtained by cooling;

[0142] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in Preparation Example 17 is injected, 90 DEG C is dried for 0.5h, then 180 DEG C is heated for 2.5h melting, the PPR pipe injected in S1 is put into the heat preservation layer mold, then the molten material is injected into the mold, to obtain the PPR pipe coated with the heat preservation layer;

[0143] S3, the protective layer mold is installed on the injection molding machine, the formula provided in Preparation Example 20 is injected, 90 DEG C is dried for 0.5h, then 150 DEG C is heated for 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is put into the protective layer mold, then the molten material is injected into the mold, to obtain the corrosion-resistant heat preservation pipe fitting.

[0144] Comparative Example 3

[0145] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0146] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in Preparation Example 12 is injected, 90 DEG C is dried for 0.5h, then 260 DEG C is heated for 2.5h melting, then the molten material is injected into the mold, and PPR pipe is obtained after cooling;

[0147] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in Preparation Example 17 is injected, 90 DEG C is dried for 0.5h, then 180 DEG C is heated for 2.5h melting, the PPR pipe injected in S1 is put into the heat preservation layer mold, then the molten material is injected into the mold, to obtain the PPR pipe coated with the heat preservation layer;

[0148] S3, the protective layer mold is installed on the injection molding machine, the formula provided in Preparation Example 20 is injected, 90 DEG C is dried for 0.5h, then 150 DEG C is heated for 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is put into the protective layer mold, then the molten material is injected into the mold, to obtain the corrosion-resistant heat preservation pipe fitting.

[0149] Comparative Example 4

[0150] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0151] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in Preparation Example 13 is injected, 90 DEG C is dried for 0.5h, then 260 DEG C is heated for 2.5h melting, then the molten material is injected into the mold, and PPR pipe is obtained after cooling;

[0152] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in Preparation Example 17 is injected, 90 DEG C is dried for 0.5h, then 180 DEG C is heated for 2.5h melting, the PPR pipe injected in S1 is put into the heat preservation layer mold, then the molten material is injected into the mold, to obtain the PPR pipe coated with the heat preservation layer;

[0153] S3, the protective layer mold is installed on the injection molding machine, the formula provided in Preparation Example 20 is injected, 90 DEG C is dried for 0.5h, then 150 DEG C is heated for 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is put into the protective layer mold, then the molten material is injected into the mold, to obtain the corrosion-resistant heat preservation pipe fitting.

[0154] Comparative Example 5

[0155] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0156] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in Preparation Example 14 is injected, 90 DEG C is dried for 0.5h, then 260 DEG C is heated for 2.5h melting, then the molten material is injected into the mold, and PPR pipe is obtained after cooling;

[0157] S2, the heat preservation layer mold is installed on the injection molding machine, the formula provided in Preparation Example 17 is injected, 90 DEG C is dried for 0.5h, then 180 DEG C is heated for 2.5h melting, the PPR pipe injected in S1 is put into the heat preservation layer mold, then the molten material is injected into the mold, to obtain the PPR pipe coated with the heat preservation layer;

[0158] S3, the protective layer mold is installed on the injection molding machine, the formula provided in Preparation Example 20 is injected, 90 DEG C is dried for 0.5h, then 150 DEG C is heated for 2.5h melting, the PPR pipe coated with the heat preservation layer injected in S2 is put into the protective layer mold, then the molten material is injected into the mold, to obtain the corrosion-resistant heat preservation pipe fitting.

[0159] Comparative Example 6

[0160] The present comparative example discloses a kind of corrosion-resistant heat preservation pipe fitting, which is prepared by the following steps:

[0161] S1, the PPR layer mold is installed on the injection molding machine, the formula provided in Preparation Example 15 is injected, 90 DEG C is dried for 0.5h, then 260 DEG C is heated for 2.5h melting, then the molten material is injected into the mold, and PPR pipe is obtained after cooling;

[0162] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 17 is used for injection molding, 90℃ drying for 0.5h, then 180℃ heating for 2.5h melting, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0163] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 20 is used for injection molding, 90℃ drying for 0.5h, then 150℃ heating for 2.5h melting, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0164] Comparative Example 7

[0165] This comparative example discloses a corrosion-resistant thermal insulation pipe fitting, which is prepared by the following steps:

[0166] S1, the mold of the PPR layer is installed on the injection molding machine, the PPR masterbatch is used for injection molding, 90℃ drying for 0.5h, then 260℃ heating for 2.5h melting, then the molten material is injected into the mold, and cooling to obtain the PPR pipe;

[0167] S2, the mold of the thermal insulation layer is installed on the injection molding machine, the formula provided in Preparation Example 17 is used for injection molding, 90℃ drying for 0.5h, then 180℃ heating for 2.5h melting, the PPR pipe injected in S1 is put into the mold of the thermal insulation layer, then the molten material is injected into the mold, to obtain the PPR pipe coated with the thermal insulation layer;

[0168] S3, the mold of the protective layer is installed on the injection molding machine, the formula provided in Preparation Example 20 is used for injection molding, 90℃ drying for 0.5h, then 150℃ heating for 2.5h melting, the PPR pipe coated with the thermal insulation layer injected in S2 is put into the mold of the protective layer, then the molten material is injected into the mold, to obtain the corrosion-resistant thermal insulation pipe fitting.

[0169] Performance test

[0170] The PPR pipe fittings prepared in the examples and comparative examples are detected for antibacterial performance and antibacterial durability according to JC / T 939-2004 "Bactericidal Performance of Anti-theatrical Plastic Pipes for Building", the test bacteria is Staphylococcus aureus, and the specific data is shown in Table 1.

[0171] According to GB / T 1043.1-2008 "Determination of Izod Impact Properties of Plastics - Part 1: Non-Izod Instrumented Impact Test", 1A type sample is prepared according to A type mold in GB / T 17037.1-1997 "Preparation of Test Specimens of Thermoplastics Polymers - Part 1: General Principles and Preparation of Multipurpose Test Specimens and Longitudinal Test Specimens", and the impact strength of the PPR material prepared by injection molding according to the PPR ratio of the examples and comparative examples is detected, and the specific data is shown in Table 1.

[0172] Table 1 Performance detection table

[0173]

[0174] It can be seen from the combination of Example 2 and Comparative Example 1, Comparative Example 6 and Comparative Example 7 and Table 1 that the impact resistance and antibacterial properties of the PPR material can be effectively improved by adding the crystallization promoter under the condition of adding the impact resistance modifier and the antibacterial carrier. The main reason is that the crystallization promoter promotes the crystallization of PPR, so that the impact resistance modifier and the antibacterial carrier are more closely combined in the PPR material, and the overall density and strength of the PPR are improved, so that the bacteria are more difficult to survive on the surface of the PPR material.

[0175] It can be seen from the combination of Example 2 and Comparative Example 2, Comparative Example 5 and Comparative Example 7 and Table 1 that the antibacterial carrier is added under the condition of adding the impact resistance modifier and the crystallization promoter, which effectively improves the antibacterial properties on the one hand, and promotes the strength growth of the PPR material on the other hand, and plays a role in promoting crystallization, so that the density of the PPR material is further improved.

[0176] It can be seen from the combination of Example 2 and Comparative Example 3, Comparative Example 4 and Comparative Example 7 and Table 1 that the addition of the impact resistance modifier makes the antibacterial carrier more stably combined in the PPR material, and the crystallization promoter enhances the bonding strength of the antibacterial carrier in the PPR material, so as to buffer the impact of water erosion, so that the antibacterial carrier is more stable. And when the silver ion or the antibacterial carrier loaded with anions is lost due to water erosion, the quaternary phosphonium salt antibacterial molecules in the impact resistance modifier also play a role, so that the antibacterial durability is improved.

[0177] It can be seen from the combination of Example 2, Example 4 and Example 5 and Table 1 that the organic intercalated montmorillonite and the mullite fiber are combined under the action of aniline solution, so that the organic intercalated montmorillonite is loaded on the mullite fiber. The silver ion loading makes the composite carrier have antibacterial properties, and the mullite fiber makes the organic intercalated montmorillonite combined on the mullite fiber more stably in the PPR material, so that the silver ion loaded on the mullite fiber and the silver ion loaded on the organic intercalated montmorillonite fiber continuously and stably play the antibacterial role.

[0178] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An erosion resistant insulated pipe fitting, characterized by, The application relates to a kind of anti-corrosion heat preservation pipe fittings, including the PPR pipe layer in the inner layer, the PPR pipe layer is provided with a heat preservation layer, the heat preservation layer is provided with a protective layer outside, the PPR pipe layer is made of the following weight parts of raw materials: PPR master batch 80-90 parts, antibacterial component 10-20 parts, the antibacterial component includes impact modifier, antibacterial load and crystallization accelerator, the weight ratio of the impact modifier, antibacterial load and crystallization accelerator is 4-9:3-6:3; The impact modifier is quaternary phosphonium salt polymer antibacterial agent covered with a connecting layer; The crystallization accelerator is a rare earth beta nucleating agent; The impact modifier is prepared by the following steps: S1, preparing antibacterial core; S2, preparing connecting layer shell; S3, condensation drying; The specific steps of the antibacterial core are as follows: chlorinated rubber is dissolved in N,N-dimethylformamide, then N,N-dimethylformamide solution of organic phosphine is added, reflux reaction is carried out in a nitrogen environment, after reaction, the excess product is filtered out, distilled water and emulsifier are mixed, then the product solution is added, and antibacterial modified chlorinated rubber emulsion is prepared by stirring and mixing; The specific steps of preparing the connecting layer shell are as follows: first, butyl acrylate pre-emulsion is prepared, then it is dropped into the antibacterial modified chlorinated rubber emulsion, heated to 75 DEG C in a nitrogen atmosphere, an initiator is added, and grafted emulsion is prepared by reaction; The specific steps of condensation drying are as follows: the grafted emulsion is added to magnesium sulfate solution for condensation, when the liquid is clear, powder particles are obtained by filtration, and the impact modifier is prepared by drying the powder particles; The antibacterial load is prepared by the following steps: S1, composite carrier preparation: organic intercalated montmorillonite is mixed with mullite fibers, soaked in aniline solution, centrifuged, washed with water and dried, the mixture after drying is placed in hydrochloric acid solution, stirred, then ammonium persulfate is added to initiate, ammonia water is added to adjust the pH to 7, then centrifuged, distilled water is washed and vacuum dried to obtain a composite carrier; S2, antibacterial loading: the composite carrier is placed in silver nitrate solution, soaked and stirred, then centrifuged, distilled water is washed and vacuum dried to obtain the antibacterial load.

2. The corrosion resistant insulated pipe fitting of claim 1, wherein: The heat preservation layer is a polyethylene foaming layer, which is prepared from the following raw materials in parts by weight: polyethylene 20-40 parts, polypropylene 8-12 parts, filler 1-10 parts, foaming agent 0.1-0.3 parts, foaming promoter 0.5-1.0 parts, bridging agent 0.5-1 part and lubricant 0.1-0.5 part.

3. The corrosion resistant insulated pipe fitting of claim 1, wherein: The protective layer is a polyolefin elastomer layer, which is made of the following raw materials in parts by weight: polyolefin elastomer 40-50 parts, polyethylene 30-50 parts, titanium dioxide 8-10 parts and clay 3-5 parts.

4. The corrosion resistant insulated pipe fitting of claim 1, wherein: The preparation process of the anti-corrosion heat preservation pipe fitting comprises the following steps: PPR layer is injection molded, after injection molding, the heat preservation layer is injection molded on the outer layer of the PPR layer, and finally the protective layer is injection molded on the outer layer of the heat preservation layer, to complete the preparation of the anti-corrosion heat preservation pipe fitting.

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