Reinforcing and toughening type special material for injection molding products, preparation method of reinforcing and toughening type special material, inspection well and preparation method of inspection well

Abstract

The invention belongs to the technical field of plastic pipelines, and particularly discloses a reinforcing and toughening type special material for injection molding products. Comprising 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene reclaimed material, 6-8 parts of modified material, 2-3 parts of polyolefin elastomer, 5-8 parts of talcum powder, 5-6 parts of active agent, 1 part of drying agent, 5-8 parts of acrylate impact modifier ACR, 10-12 parts of glass fiber and 0.5-1.0 part of coupling agent. The invention provides a reinforcing and toughening type special material for injection molding products, a preparation method of the reinforcing and toughening type special material, an inspection well and a preparation method of the inspection well. The prepared special material can meet the existing processing technology; the special material is compatible with a recycled material, the compatibility is good, the strength of a weld line of the prepared inspection well is high, and the inspection well has relatively high toughness and rigidity.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pipes, and in particular relates to a special reinforced and toughened material for injection molding products and a preparation method thereof, and an inspection well and a preparation method thereof. Background Art

[0002] The invention of plastic drainage fittings is a revolution in the global pipeline industry. It is used to replace brick inspection wells and connecting pipes, and has solved the problems of difficult construction, loose connections, water seepage, etc. It can adapt to angle changes within a small range, is easy and fast to construct, has good sealing performance, and is leak-proof. It effectively prevents secondary pollution of groundwater and is an environmentally friendly and energy-saving building material. In recent years, the use of various types of polypropylene raw materials, ultra-high molecular weight polyethylene, modified materials and other materials has increased rapidly, and drainage fittings made of different raw materials have been continuously developed, produced and applied.

[0003] Among them, the plastic inspection well for urban drainage is made of polypropylene (PP) and is molded by one-time injection molding. It uses accessories such as reducers, angle joints and rubber seals to achieve the purpose of changing the pipe diameter and angle, which meets the national standard requirements of GB / T41048. This pipe fitting is suitable for the design, construction and maintenance of plastic drainage inspection well projects with an outer diameter of no more than 1200mm and a buried depth of no more than 8m in building communities (residential areas, public building areas, factory areas, etc.), urban and rural municipalities, industrial parks, and old city reconstruction.

[0004] Plastic inspection wells for urban drainage have replaced red bricks and cement, saving topsoil resources; the size of the building area has been reduced, greatly saving the land space occupied by the buried inspection wells. This is of great significance for saving energy, reducing pollution and protecting the environment.

[0005] However, with the continuous deepening of its use, problems are constantly exposed, such as: ① The axial load performance of the pipe fittings is not high, resulting in limited bearing capacity, and it is easy to deform under the pressure of heavy objects; ② The strength of the inspection well welding line is low. When the inspection well and the wellbore are connected with a cap rubber ring, in order to ensure the water-tight performance, the sealing ring has a certain compression and extrusion pressure, causing the inspection well joint line to crack; ③ The poor rigidity of the pipe fittings makes it easy for the pipe fittings to break during throwing or transportation. Summary of the invention

[0006] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a reinforced and toughened special material for injection molding products and a preparation method thereof, an inspection well and a preparation method thereof. The prepared special material can meet the existing processing technology; the special material is compatible with the recycled material and has good compatibility. The weld line of the prepared inspection well has high strength and has high toughness and rigidity.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, the present invention provides a special reinforcing and toughening material for injection molding products, which comprises, by weight: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled material, 6-8 parts of modified material, 2-3 parts of polyolefin elastomer, 5-8 parts of talc, 5-6 parts of active agent, 1 part of desiccant, 5-8 parts of acrylic impact modifier ACR, 10-12 parts of glass fiber, and 0.5-1.0 parts of coupling agent.

[0009] Furthermore, the modified material includes the following raw materials in parts by weight: 120-160 parts of heavy calcium carbonate, 20-40 parts of LLDPE recycled materials, 1-3 parts of coupling agent, 0.5-2.5 parts of stearic acid, 1-5 parts of PE wax, and 3-6 parts of PE masterbatch.

[0010] Furthermore, the modified material includes the following raw materials in parts by weight: 150 parts of heavy calcium carbonate, 30 parts of LLDPE recycled materials, 2 parts of coupling agent, 1 part of stearic acid, 3 parts of PE wax, and 4 parts of PE masterbatch.

[0011] Furthermore, the particle size of the heavy calcium carbonate is 800-1000 mesh.

[0012] In a second aspect, the present invention provides a method for preparing a special reinforced toughening material for injection molding products, the preparation method comprising the following steps:

[0013] S1: According to the raw material formula of the special material for strengthening and toughening, various raw materials are weighed and sent into a mixer for mixing to prepare a mixed material;

[0014] S2: The mixed materials are sent into the extruder for plasticization, then into the porous die for extrusion, and finally into the water tank for cooling to prepare the pre-material;

[0015] S3: The pre-material is sent into a shaking machine for shaking, and then air-dried in an air dryer. Finally, it is pulled, cut, and filtered through a shaking screen to prepare a special reinforced and toughened material.

[0016] Furthermore, in step S2, during the process of feeding the mixed materials into the extruder for plasticization, the extruder is provided with 8 barrels, and the temperatures of the 8 barrels are independently selected from 260-280°C.

[0017] Furthermore, a connector is provided between the extruder and the porous die, and the temperature of the connector is 275°C.

[0018] Furthermore, the temperature of the porous mold is 280°C.

[0019] In a third aspect, the present invention provides an inspection well, which comprises, by weight percentage: 70-80% of recycled material and 20-30% of special material;

[0020] The special material is a reinforced and toughened special material for injection molding products provided in the embodiment of the first aspect of the present invention, or a reinforced and toughened special material for injection molding products prepared by a preparation method of a reinforced and toughened special material for injection molding products provided in the embodiment of the second aspect of the present invention.

[0021] In a fourth aspect, the present invention provides a method for preparing an inspection well, the method comprising the following steps:

[0022] Step 1: According to the formula, weigh the recycled material and special material, mix them evenly, and then prepare the inspection well raw material after melting, extrusion granulation and cooling;

[0023] Step 2: Prepare the inspection well blank after the inspection well raw material is sucked by the injection molding machine, the screw is heated and stored, the mold is closed, the injection is performed, and the inspection well blank is cooled and formed;

[0024] Step three: the inspection well blank is then opened and ejected from the mold to prepare an inspection well semi-finished product, and finally trimmed and tested to obtain an inspection well.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention provides a special material for strengthening and toughening injection molding products, which can meet the existing processing technology, and the compatibility between the raw materials in the special material is good.

[0027] 2. The present invention provides a special material for reinforcing and toughening injection molding products. The special material is matched with the recycled material, and the compatibility is good. After the special material and the recycled material are matched, the weld line of the prepared inspection well has high strength, and when the inspection well and the wellbore are connected with a cap rubber ring, the cracking of the inspection well seam line is avoided; the prepared inspection well also has high toughness and rigidity, and is not easy to break during throwing or transportation.

[0028] 3. In the present invention, the raw materials of the inspection well are recycled materials and the reinforced and toughened special materials for injection molding products provided by the present invention. The recycled materials and the special materials are mixed and melted, and then granulated to prepare the raw materials for the inspection well. The inspection well prepared in this way has good compatibility between the special materials and the recycled materials, and the mixed raw materials for the inspection well have good uniformity, thereby ensuring that the performance of the prepared inspection well is better.

[0029] 4. In the present invention, polyolefin elastomer and acrylic impact modifier ACR are added to the special material, which not only promotes the compatibility of the raw materials in the special material, but also has the effect of improving the tolerance, impact resistance and low-temperature toughness of the product; adding glass fiber can also improve the impact resistance of the product.

[0030] 5. In the present invention, polypropylene resin, polypropylene and polypropylene recycled materials are added to the special material, which can effectively improve the rigidity of the product, improve the impact resistance of the product and improve the tensile strength of the product while balancing the cost of the special material formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 It is a process flow chart of a method for preparing a special reinforced and toughened material for injection molding products provided by the present invention;

[0033] Figure 2 The present invention is a process flow chart of the method for preparing the inspection well provided by the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the first aspect, the present invention provides a special material for strengthening and toughening injection molding products, which comprises, by weight: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled material, 6-8 parts of modified material, 2-3 parts of polyolefin elastomer, 5-8 parts of talc, 5-6 parts of active agent, 1 part of desiccant, 5-8 parts of acrylic impact modifier ACR, 10-12 parts of glass fiber, and 0.5-1.0 parts of coupling agent;

[0036] The modified material includes the following raw materials, calculated by weight: 120-160 parts of heavy calcium carbonate, 20-40 parts of LLDPE recycled material, 1-3 parts of coupling agent, 0.5-2.5 parts of stearic acid, 1-5 parts of PE wax, and 3-6 parts of PE masterbatch;

[0037] Preferably, the modified material includes the following raw materials in parts by weight: 150 parts of heavy calcium carbonate, 30 parts of LLDPE recycled materials, 2 parts of coupling agent, 1 part of stearic acid, 3 parts of PE wax, and 4 parts of PE masterbatch; more preferably, the heavy calcium carbonate is the heavy calcium carbonate produced by Jingxian Masi, and the LLDPE recycled materials are the LLDPE recycled materials produced by Suzhou Zechong;

[0038] Among them, the particle size of heavy calcium carbonate is 800-1000 mesh.

[0039] Polypropylene resin is used as a carrier to carry other raw materials for mixing;

[0040] Among them, polypropylene is added to increase the rigidity of the product prepared by using the reinforced and toughened special material and improve its impact resistance;

[0041] The raw materials of the special reinforced toughening material are also added with polypropylene recycled materials, which can be blended with other raw materials to balance the formula cost and improve the tensile strength.

[0042] The modified material is a mixture of LLDPE and heavy calcium carbonate, which can significantly improve the mechanical strength, friction resistance, thermal properties and aging resistance of the material; the addition of the modified material makes the product made of this enhanced and toughened special material show better performance in terms of bearing external force, resisting deformation and resisting temperature changes;

[0043] Polyolefin elastomers can promote the compatibility of various materials such as polypropylene resin, polypropylene and modified materials in the calcium raw material formula, and have the effect of improving the tolerance of the product;

[0044] The raw materials of the special reinforced toughening material are also added with talcum powder, which is used as a reinforcing filler to increase the tensile and bending stress of the product prepared by using the special reinforced toughening material;

[0045] The activator is a common activator used in raw materials of injection molding products. The activator is used to increase the activity of each raw material in the formula and promote the full effect of the performance of each raw material;

[0046] The main component of desiccant is calcium oxide (CaO). It is white in appearance and in granular form. It has the following characteristics: ① Strong water absorption: It can absorb a large amount of water and react with water to form calcium hydroxide (Ca(OH)2), while releasing a large amount of heat. ② Good stability: It is very stable at room temperature and is not easily destroyed by chemical reactions. ③ Low price: It is a common chemical raw material with low cost of use;

[0047] The raw materials of the special reinforced toughening material are also added with an acrylic ester impact modifier ACR, which can significantly improve the impact resistance and low-temperature toughness of the product prepared by using the special reinforced toughening material, and also play a role in promoting the compatibility of various materials in the formula;

[0048] Glass fiber is also added to the raw materials of the special reinforced and toughened material to improve the impact resistance of the product prepared by using the special reinforced and toughened material.

[0049] Second, as Figure 1 As shown, the present invention provides a method for preparing a special reinforced toughening material for injection molding products, the preparation method comprising the following steps:

[0050] S1: Metered batching

[0051] According to the raw material formula of the special material for strengthening and toughening, weigh each raw material;

[0052] S2: Raw material mixing

[0053] The raw materials weighed in step S1 are fed into a mixer for mixing to prepare a mixed material;

[0054] S3: screw plasticization, porous die extrusion, water tank cooling

[0055] The mixed materials are fed into the extruder for plasticization, and then into the porous die for extrusion, and finally into the water tank for cooling to prepare the pre-material; wherein, during the process of the mixed materials being fed into the extruder for plasticization, the extruder is provided with 8 barrels, namely barrel zone 1 to barrel zone 8, and specifically, the temperature of barrel zone 1 to barrel zone 8 is 270°C ± 10°C, and more specifically, the temperature of barrel zone 1 to barrel zone 8 is on the rise; a connector is provided between the extruder and the porous die, and the temperature of the connector is 275°C; the porous die is provided with 4 partitions, namely zones 1 to 4, and the temperature of zones 1 to 4 of the porous die is 280°C;

[0056] S4: The pre-material is sent into a shaking machine for shaking, and then air-dried in an air dryer. Finally, it is cut by traction, filtered by a shaking screen, and then put into a tank after testing to prepare a special reinforced and toughened material.

[0057] In a third aspect, the present invention further provides an inspection well, which comprises, by weight percentage, 70-80% of recycled material and 20-30% of special material; the special material is the enhanced and toughened special material for injection molding products provided in the embodiment of the first aspect of the present invention;

[0058] Preferably, calculated by weight percentage, the raw materials of the inspection well include: 75% recycled material and 25% special material.

[0059] Fourthly, Figure 2As shown, the present invention also provides a method for preparing an inspection well, and the method for preparing the inspection well is as follows: according to the formula, the returned material and the special material are weighed, mixed evenly, and then melted, extruded, granulated, and cooled to prepare the inspection well raw material; the inspection well raw material is sucked by the injection molding machine, the screw is heated and stored, the mold is closed, injection molded, and cooled to shape to prepare the inspection well blank; the inspection well blank is then opened and ejected from the mold to prepare the inspection well semi-finished product, and finally it is trimmed, tested, and put into storage to prepare the inspection well.

[0060] Preparation Example 1-3 provides a special reinforced and toughened material for injection molding products.

[0061] Preparation Example 1

[0062] This preparation example provides a special material for strengthening and toughening injection molding products, which includes, by weight: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled material, 7 parts of modified material, 2.5 parts of polyolefin elastomer, 6.5 parts of talc, 5.5 parts of active agent, 1 part of desiccant, 6.5 parts of acrylic impact modifier ACR, 11 parts of glass fiber, and 0.8 parts of coupling agent;

[0063] Among them, the modified material includes the following raw materials in parts by weight: 150 parts of heavy calcium carbonate, 30 parts of LLDPE recycled materials, 2 parts of coupling agent, 1 part of stearic acid, 3 parts of PE wax, and 4 parts of PE masterbatch; specifically, the particle size of heavy calcium carbonate is 800 mesh;

[0064] This preparation example also provides a method for preparing a reinforced and toughened special material for injection molding products, the preparation method comprising the following steps:

[0065] S1: According to the raw material formula of the special material for strengthening and toughening, various raw materials are weighed and sent into a mixer for mixing to prepare a mixed material;

[0066] S2: The mixed materials are fed into the extruder for plasticization, and then extruded into the porous die, and finally cooled in the water tank to prepare the pre-material; wherein, during the process of feeding the mixed materials into the extruder for plasticization, the extruder is provided with 8 barrels, namely barrel zone 1 to barrel zone 8, and specifically, the temperature of barrel zone 1 to barrel zone 8 is 270°C ± 10°C, and more specifically, the temperature of barrel zone 1 to barrel zone 8 is on the rise; a connector is provided between the extruder and the porous die, and the temperature of the connector is 275°C, and the porous die is provided with four partitions, and the temperature of the porous die zones 1 to 4 is 280°C;

[0067] S3: The pre-material is sent into a shaking machine for shaking, and then air-dried in an air dryer. Finally, it is pulled, cut, and filtered through a shaking screen to prepare a special reinforced and toughened material.

[0068] Preparation Example 2

[0069] This preparation example provides a special material for strengthening and toughening injection molding products, which includes, by weight: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled material, 6 parts of modified material, 3 parts of polyolefin elastomer, 8 parts of talcum powder, 5 parts of active agent, 1 part of desiccant, 5 parts of acrylic impact modifier ACR, 10 parts of glass fiber, and 0.5 parts of coupling agent;

[0070] Among them, the modified material includes the following raw materials in parts by weight: 120 parts of heavy calcium carbonate, 40 parts of LLDPE recycled materials, 3 parts of coupling agent, 0.5 parts of stearic acid, 5 parts of PE wax, and 6 parts of PE masterbatch; specifically, the particle size of heavy calcium carbonate is 800 mesh;

[0071] This preparation example also provides a preparation method for a special reinforced and toughened material for injection molding products, and the preparation method is carried out with reference to the preparation method provided in Preparation Example 1.

[0072] Preparation Example 3

[0073] This preparation example provides a special material for strengthening and toughening injection molding products, which includes, by weight: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled material, 8 parts of modified material, 2 parts of polyolefin elastomer, 5 parts of talcum powder, 6 parts of active agent, 1 part of desiccant, 8 parts of acrylic impact modifier ACR, 12 parts of glass fiber, and 1.0 part of coupling agent;

[0074] The modified material includes the following raw materials by weight: 120-160 parts of heavy calcium carbonate, 20-40 parts of LLDPE recycled materials, 1-3 parts of coupling agent, 0.5-2.5 parts of stearic acid, 1-5 parts of PE wax, and 3-6 parts of PE masterbatch; specifically, the particle size of heavy calcium carbonate is 800 mesh;

[0075] This preparation example also provides a preparation method for a special reinforced and toughened material for injection molding products, and the preparation method is carried out with reference to the preparation method provided in Preparation Example 1.

[0076] The following are specific embodiments. Unless otherwise specified, in the following embodiments, all raw materials can be obtained from the market. In the following embodiments, the recycled materials are of the brand Dacheng recycled materials.

[0077] Example 1

[0078] This embodiment provides an inspection well, which includes, by weight percentage: 75% of recycled material and 25% of special material;

[0079] Among them, the special material is a reinforced and toughened special material for injection molding products provided in Preparation Example 1.

[0080] This embodiment also provides a method for preparing a manhole, the method comprising the following steps:

[0081] Step 1: According to the formula of the inspection well, weigh the recycled material and the special material, mix them evenly, and then prepare the inspection well raw material after melting, extrusion granulation and cooling;

[0082] Step 2: Prepare the inspection well blank after the inspection well raw material is sucked by the injection molding machine, the screw is heated and stored, the mold is closed, the injection is performed, and the inspection well blank is cooled and formed;

[0083] Step three: the inspection well blank is then opened and ejected from the mold to prepare an inspection well semi-finished product, and finally trimmed and tested to obtain an inspection well.

[0084] Example 2

[0085] This embodiment provides an inspection well, which includes, by weight percentage: 75% of recycled material and 25% of special material;

[0086] Among them, the special material is a reinforced and toughened special material for injection molding products provided in Preparation Example 2.

[0087] This embodiment also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the method for preparing an inspection well provided in Example 1.

[0088] Example 3

[0089] This embodiment provides an inspection well, which includes, by weight percentage: 75% of recycled material and 25% of special material;

[0090] Among them, the special material is a reinforced and toughened special material for injection molding products provided in Preparation Example 3.

[0091] This embodiment also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the method for preparing an inspection well provided in Example 1.

[0092] Comparative Example 1

[0093] This comparative example provides a manhole, which comprises, by weight percentage, 66% of recycled material and 34% of special material;

[0094] Among them, the special material is a reinforced and toughened special material for injection molding products provided in Preparation Example 1.

[0095] This comparative example also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the preparation method for the inspection well in Example 1.

[0096] Comparative Example 2

[0097] This comparative example provides a manhole, which comprises, by weight percentage, 42% of recycled material, 29% of special material, and 29% of granulated material;

[0098] Among them, the granulation material is prepared by mixing the recycled material and the special material in a mass ratio of 3:1, melting, extruding granulation, and cooling; in the raw material composition of the inspection well and the raw material composition of the granulation material, the special material is a special material for strengthening and toughening injection molding products provided in Preparation Example 1;

[0099] This comparative example also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the preparation method for the inspection well in Example 1.

[0100] Comparative Example 3

[0101] This comparative example provides a manhole, which comprises, by weight percentage: 42% of recycled material and 58% of polypropylene resin;

[0102] This comparative example also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the preparation method for the inspection well in Example 1.

[0103] Comparative Example 4

[0104] This comparative example provides a manhole, which comprises, by weight percentage: 75% of recycled material and 25% of polypropylene resin;

[0105] This comparative example also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the preparation method for the inspection well in Example 1.

[0106] Comparative Example 5

[0107] This comparative example provides an inspection well, which comprises, by weight percentage: 100% polypropylene resin;

[0108] This comparative example also provides a method for preparing an inspection well, and the preparation method is carried out with reference to the preparation method for the inspection well in Example 1.

[0109] Experimental example

[0110] The inspection wells for urban drainage provided in the embodiments and comparative examples were used in actual production, and performance tests were performed on them. The test results are shown in Table 1, Table 2 and Table 3.

[0111] Table 1 Test results of routine performance of raw materials for inspection wells

[0112]

[0113]

[0114] From the data in Table 1, from the perspective of tensile strength, the differences among the three are small; however, from the perspective of notch impact, the inspection well in Example 1 is much higher than that in Comparative Example 1 and Comparative Example 2;

[0115] Table 2 Statistical results of production cracking in inspection wells

[0116]

[0117] It can be seen from the data in Table 2 that when the raw materials of the inspection well in the comparative example are used to produce the inspection well products, cracking occurs, and the frequency of cracking is relatively high. However, when the raw materials and preparation method provided by the present invention are used to produce the inspection well products, not only continuous production can be achieved, but also continuous production for 120 hours (producing 450*300 sediment straight-through) without any fracture.

[0118] Table 3 Summary of inspection well product performance test data

[0119]

[0120] In addition, when the raw materials of the inspection wells in Examples 2 and 3 were used to produce inspection well products (450*300 flow channel straight-through, 630*500 sludge elbow), the flattening test achieved the same effect as that of Example 1;

[0121] From the data in Table 3, we can see that:

[0122] 1. The load and impact of the inspection well provided in Example 1 can meet the requirements of the internal control standards, and the limit load value is slightly higher than that of Comparative Example 2;

[0123] 2. Flattening and stretching: The flattening performance and stability of the inspection well products produced by using the special material provided by the present invention, combined with the inspection well formula and the inspection well preparation method provided by the present invention, are significantly better than those of the comparative example. The strength of the inspection well products at the weld line is tested by tensile testing, and the strength is significantly higher than that of the existing production formula (i.e., comparative example 1 and comparative example 2), which can effectively improve the cracking abnormality caused by external extrusion;

[0124] The present invention provides a special material for strengthening and toughening injection molding products and a preparation method thereof, a manhole and a preparation method thereof. The raw material formula of the special material is reasonably designed, and the problem of cracking of product weld marks caused by poor compatibility of various raw materials can be solved; by using additives such as activators and polyolefin elastomers, the compatibility of various raw materials in the formula is promoted; by adding modified materials, talcum powder, glass fiber, acrylic ester impact modifiers, etc., the rigidity and toughness of the product are improved;

[0125] This special material is used in the production of inspection wells, and the cracking phenomenon of the weld marks of the prepared inspection wells is significantly improved, the product qualification rate is improved, and the finished product rate is improved; moreover, the load and impact performance of the prepared inspection wells meet the internal control standard requirements, and the cost is optimized.

[0126] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0127] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A special material for strengthening and toughening injection molding products, characterized in that: Calculated by weight, it includes: 20 parts of polypropylene resin, 15 parts of polypropylene, 30 parts of polypropylene recycled materials, 6-8 parts of modified materials, 2-3 parts of polyolefin elastomer, 5-8 parts of talc, 5-6 parts of active agent, 1 part of desiccant, 5-8 parts of acrylic impact modifier ACR, 10-12 parts of glass fiber, and 0.5-1.0 parts of coupling agent.

2. The reinforced and toughened special material for injection molding products according to claim 1, characterized in that: Calculated by weight, the modified material includes the following raw materials: 120-160 parts of heavy calcium carbonate, 20-40 parts of LLDPE recycled materials, 1-3 parts of coupling agent, 0.5-2.5 parts of stearic acid, 1-5 parts of PE wax, and 3-6 parts of PE masterbatch.

3. The special reinforced and toughened material for injection molding products according to claim 2, characterized in that: In terms of weight, the modified material includes the following raw materials: 150 parts of heavy calcium carbonate, 30 parts of LLDPE recycled materials, 2 parts of coupling agent, 1 part of stearic acid, 3 parts of PE wax, and 4 parts of PE masterbatch.

4. The special reinforced and toughened material for injection molding products according to claim 2, characterized in that: The particle size of the heavy calcium carbonate is 800-1000 meshes.

5. A method for preparing a special reinforced and toughened material for injection molding products according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: S1: According to the raw material formula of the special material for strengthening and toughening, various raw materials are weighed and sent into a mixer for mixing to prepare a mixed material; S2: The mixed materials are sent into the extruder for plasticization, then into the porous die for extrusion, and finally into the water tank for cooling to prepare the pre-material; S3: The pre-material is sent into a shaking machine for shaking, and then air-dried in an air dryer. Finally, it is pulled, cut, and filtered through a shaking screen to prepare a special reinforced and toughened material.

6. The method for preparing a special reinforced and toughened material for injection molding products according to claim 5, characterized in that: In step S2, during the process of feeding the mixed materials into the extruder for plasticization, the extruder is provided with 8 barrels, and the temperatures of the 8 barrels are independently selected from 260-280°C.

7. The method for preparing a special reinforced and toughened material for injection molding products according to claim 5, characterized in that: A connector is provided between the extruder and the porous die, and the temperature of the connector is 275°C.

8. The method for preparing a special reinforced and toughened material for injection molding products according to claim 5, characterized in that: The temperature of the porous mold was 280°C.

9. An inspection well, characterized in that: According to the percentage by weight, it includes: 70-80% of recycled materials and 20-30% of special materials; The special material is the reinforced and toughened special material for injection molding products as described in any one of claims 1-4 or the reinforced and toughened special material for injection molding products prepared by the preparation method of the reinforced and toughened special material for injection molding products as described in any one of claims 5-8.

10. A method for preparing an inspection well according to claim 9, characterized in that: The preparation method comprises the following steps: Step 1: According to the formula, weigh the recycled material and special material, mix them evenly, and then prepare the inspection well raw material after melting, extrusion granulation and cooling; Step 2: Prepare the inspection well blank after the inspection well raw material is sucked by the injection molding machine, the screw is heated and stored, the mold is closed, the injection is performed, and the inspection well blank is cooled and formed; Step three: the inspection well blank is then opened and ejected from the mold to prepare an inspection well semi-finished product, and finally trimmed and tested to obtain an inspection well.

Images