CN110748734B - Plastic pipe fitting suitable for engineering machinery - Google Patents
Plastic pipe fitting suitable for engineering machinery Download PDFInfo
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- CN110748734B CN110748734B CN201911033726.4A CN201911033726A CN110748734B CN 110748734 B CN110748734 B CN 110748734B CN 201911033726 A CN201911033726 A CN 201911033726A CN 110748734 B CN110748734 B CN 110748734B
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- Prior art keywords
- pipe section
- section
- circular
- pipe fitting
- polygonal
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/265—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from at least two different diamines or at least two different dicarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/28—Preparatory processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Abstract
The invention relates to the field of engineering machinery, in particular to a plastic pipe fitting suitable for engineering machinery. The invention provides a plastic pipe fitting suitable for engineering machinery, which comprises a circular pipe section and a polygonal pipe section; the cross section of the polygonal pipe section is a regular polygon; the section of the circular pipe section is circular; the circular pipe section and the polygonal pipe section are integrally arranged. The invention solves the problems of poor mechanical property, poor heat resistance and easy deformation of pipe fittings in the current market. The invention further synthesizes the engineering plastic pipe fitting by preparing the modified plastic material, and the obtained pipe fitting has the advantages of higher mechanical strength, high temperature resistance and difficult deformation.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a plastic pipe fitting suitable for engineering machinery.
Background
At present, most of transition joints for connecting plastic pipelines and valves of engineering machinery are machined and manufactured by copper alloy materials. The problem that the difference of the thermal expansion coefficients of metal and plastic is large, the temperature difference of media in the pipeline is large and changes in a random and alternate mode, and the pipeline and the joint are loosened and cracked to generate leakage. In the engineering field, the seepage leakage easily causes serious accidents and seriously affects the quality of engineering machinery.
The copper alloy material is expensive, resources are gradually exhausted, and the copper alloy material is also a product with high carbon emission, so that the plastic pipe fitting for the engineering machinery is urgently needed to be provided in order to replace the copper alloy material and solve the problems that the pipe fitting is poor in mechanical performance, poor in heat resistance and easy to deform.
Disclosure of Invention
Aiming at the problems, the invention provides an engineering plastic pipe fitting which comprises a circular pipe section and a polygonal pipe section; the cross section of the polygonal pipe section is a regular polygon; the section of the circular pipe section is circular; the circular pipe section and the polygonal pipe section are fixedly connected into a whole.
Preferably, the polygonal pipe section is used for fixing a valve; the circular pipe section is used for fixedly connecting with a pipeline.
Preferably, the polygonal pipe section has a cross section of one of a regular hexagon, a regular octagon, a regular decagon and a regular dodecagon.
Preferably, the engineering plastic pipe is made of modified plastic materials by a molding process.
Preferably, the preparation method of the modified plastic material comprises the following steps:
firstly, preparing hexamethylene diamine adipate by using hexamethylene diamine and adipic acid; and compounding hexamethylene diamine adipate with glycinamide hydrochloride and terephthalic acid to obtain the modified plastic material.
More preferably, the specific preparation method of the modified plastic material is as follows:
s1, weighing 23.24g of hexamethylenediamine, adding the hexamethylenediamine into 50mL of deionized water, uniformly stirring, adding 29.23g of adipic acid, uniformly stirring again, heating to 60 ℃, reacting for 3 hours, adjusting the pH value of the solution to be 7.7-8 to obtain a hexamethylenediamine adipate solution, performing suction filtration to obtain a solid, and drying in a vacuum drying oven to obtain the hexamethylenediamine adipate; wherein the stirring speed is 100-200 rpm;
s2, weighing 11.0g of glycinamide hydrochloride, 10.8g of terephthalic acid and 0.48g of benzoic acid, adding 150mL of deionized water, uniformly stirring, adding hexamethylene diamine adipate, and uniformly stirring again to obtain a mixture A; wherein the addition amount of the hexamethylene diamine adipate is 30-80% of the mass of the glycyl amine hydrochloride;
s3, placing the mixture A in a reaction kettle, filling helium into the reaction kettle to reduce the pressure to 0.1-0.5 MPa, starting to heat and stirring; wherein the stirring speed is 200-300 rpm; the heating rate is 5-10 ℃/min;
s4, increasing the pressure in the reaction kettle along with the generation of water vapor, starting to exhaust when the pressure reaches 1.5Mpa until the temperature is increased to 250-300 ℃, closing to exhaust, and keeping the temperature to react for 2-5 h to obtain a mixture B; wherein the exhaust rate is 2-3 kg/h;
and S5, feeding the cooled mixture B into a double-screw extruder for melt extrusion, cooling and granulating to obtain the modified plastic material.
The invention has the beneficial effects that:
1. the invention further synthesizes the engineering plastic pipe fitting by preparing the modified plastic material, and the obtained pipe fitting has the advantages of higher mechanical strength, high temperature resistance and difficult deformation.
2. The prior plastic synthesis method mostly adopts a method of combining prepolymerization and solid phase polycondensation, and the method has relatively low polymerization temperature, so that the obtained polymer has good color, but has the following defects: in the polymerization process, the powdery raw materials are easy to agglomerate, the requirement on the particle size of the prepolymer is severe, the polymerization process is complex, and continuous production cannot be realized. The invention adopts a melt polycondensation method to compound hexamethylene diamine adipate, glycinamide hydrochloride and terephthalic acid, and the method can overcome the problem that powdery raw materials are easy to agglomerate in the prior art because the raw materials are melted at first, and the obtained product has stronger high temperature resistance.
3. The modified plastic material obtained by compounding the hexamethylene diamine adipate, the glycinamide hydrochloride and the terephthalic acid has the advantages of higher mechanical strength, high temperature resistance and difficult deformation.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a front view of an engineering plastic pipe of the present invention;
FIG. 2 is a cross-sectional view of a polygonal pipe section in the engineering plastic pipe of example 1 of the present invention;
fig. 3 is a cross-sectional view of a circular pipe section in the engineering plastic pipe of example 1 of the present invention.
Reference numerals: 1-engineering plastic pipe fittings; 2-a circular pipe section; 3-polygonal pipe section.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
Referring to fig. 1, an engineering plastic pipe 1 comprises a circular pipe section 2 and a polygonal pipe section 3; the cross section of the regular polygon pipe section 3 is a regular hexagon (as shown in figure 2); the section of the circular pipe section 2 is circular (as shown in figure 3); the circular pipe section 2 is integrally provided with the polygonal pipe section 3.
Wherein, the polygonal pipe section 3 is used for fixing a valve; the circular pipe section 2 is used for fixedly connecting with a pipeline.
The engineering plastic pipe fitting 1 is made of a modified plastic material by a molding processing method, and the specific preparation method of the modified plastic material is as follows:
s1, weighing 23.24g of hexamethylenediamine, adding the hexamethylenediamine into 50mL of deionized water, uniformly stirring, adding 29.23g of adipic acid, uniformly stirring again, heating to 60 ℃, reacting for 3 hours, adjusting the pH value of the solution to be 7.7 to obtain a hexamethylenediamine adipate solution, performing suction filtration to obtain a solid, and drying in a vacuum drying oven to obtain hexamethylenediamine adipate; wherein the stirring speed is 100 rpm;
s2, weighing 11.0g of glycinamide hydrochloride, 10.8g of terephthalic acid and 0.48g of benzoic acid, adding 150mL of deionized water, uniformly stirring, adding hexamethylene diamine adipate, and uniformly stirring again to obtain a mixture A; wherein the addition amount of the hexamethylene diamine adipate is 30 percent of the mass of the glycyl amine hydrochloride;
s3, placing the mixture A in a reaction kettle, filling helium into the reaction kettle to reduce the pressure to 0.1MPa, starting to heat and stirring; wherein the stirring speed is 200 rpm; the heating rate is 5 ℃/min;
s4, when the pressure in the reaction kettle is increased to 1.5Mpa, starting exhaust until the temperature is increased to 250 ℃, closing the exhaust, and keeping the temperature to react for 2 hours to obtain a mixture B; wherein the exhaust rate is 2 kg/h;
and S5, feeding the cooled mixture B into a double-screw extruder for melt extrusion, cooling and granulating to obtain the modified plastic material.
Example 2
An engineering plastic pipe fitting 1 comprises a circular pipe section 2 and a polygonal pipe section 3; the cross section of the polygonal pipe section 3 is a regular hexagon; the section of the circular pipe section 2 is circular; the circular pipe section 2 is integrally provided with the polygonal pipe section 3.
Wherein, the polygonal pipe section 3 is used for fixing a valve; the circular pipe section 2 is used for fixedly connecting with a pipeline.
The engineering plastic pipe fitting 1 is made of a modified plastic material by a molding processing method, and the specific preparation method of the modified plastic material is as follows:
s1, weighing 23.24g of hexamethylenediamine, adding the hexamethylenediamine into 50mL of deionized water, uniformly stirring, adding 29.23g of adipic acid, uniformly stirring again, heating to 60 ℃, reacting for 3 hours, adjusting the pH value of the solution to be 7.8 to obtain a hexamethylenediamine adipate solution, performing suction filtration to obtain a solid, and drying in a vacuum drying oven to obtain hexamethylenediamine adipate; wherein the stirring speed is 150 rpm;
s2, weighing 11.0g of glycinamide hydrochloride, 10.8g of terephthalic acid and 0.48g of benzoic acid, adding 150mL of deionized water, uniformly stirring, adding hexamethylene diamine adipate, and uniformly stirring again to obtain a mixture A; wherein the addition amount of the hexamethylene diamine adipate is 50 percent of the mass of the glycyl amine hydrochloride;
s3, placing the mixture A in a reaction kettle, filling helium into the reaction kettle to reduce the pressure to 0.3MPa, starting to heat and stirring; wherein the stirring speed is 250 rpm; the heating rate is 8 ℃/min;
s4, when the pressure in the reaction kettle is increased to 1.5Mpa, starting exhaust until the temperature is increased to 280 ℃, closing the exhaust, and keeping the temperature to react for 3 hours to obtain a mixture B; wherein the exhaust rate is 2.5 kg/h;
and S5, feeding the cooled mixture B into a double-screw extruder for melt extrusion, cooling and granulating to obtain the modified plastic material.
Example 3
An engineering plastic pipe fitting 1 comprises a circular pipe section 2 and a polygonal pipe section 3; the cross section of the polygonal pipe section 3 is a regular hexagon; the section of the circular pipe section 2 is circular; the circular pipe section 2 is integrally provided with the polygonal pipe section 3.
Wherein, the polygonal pipe section 3 is used for fixing a valve; the circular pipe section 1 is used for fixedly connecting with a pipeline.
The engineering plastic pipe fitting is manufactured by a molding processing method of a modified plastic material, and the specific preparation method of the modified plastic material comprises the following steps:
s1, weighing 23.24g of hexamethylenediamine, adding the hexamethylenediamine into 50mL of deionized water, uniformly stirring, adding 29.23g of adipic acid, uniformly stirring again, heating to 60 ℃, reacting for 3 hours, adjusting the pH value of the solution to be 8 to obtain a hexamethylenediamine adipate solution, performing suction filtration to obtain a solid, and drying in a vacuum drying oven to obtain the hexamethylenediamine adipate; wherein the stirring speed is 200 rpm;
s2, weighing 11.0g of glycinamide hydrochloride, 10.8g of terephthalic acid and 0.48g of benzoic acid, adding 150mL of deionized water, uniformly stirring, adding hexamethylene diamine adipate, and uniformly stirring again to obtain a mixture A; wherein the addition amount of the hexamethylene diamine adipate is 80 percent of the mass of the glycyl amine hydrochloride;
s3, placing the mixture A in a reaction kettle, filling helium into the reaction kettle to reduce the pressure to 0.5MPa, starting to heat and stirring; wherein the stirring speed is 300 rpm; the heating rate is 10 ℃/min;
s4, when the pressure in the reaction kettle is increased to 1.5Mpa, starting exhaust until the temperature is increased to 300 ℃, closing the exhaust, and keeping the temperature to react for 5 hours to obtain a mixture B; wherein the exhaust rate is 3 kg/h;
and S5, feeding the cooled mixture B into a double-screw extruder for melt extrusion, cooling and granulating to obtain the modified plastic material.
In order to more clearly describe the content of the invention, the invention carries out mechanical property and high temperature resistance experiments, and concretely comprises the following steps:
TABLE 1 results of mechanical Properties and high temperature resistance measurements
| Example 1 | Example 2 | Example 3 | |
| Tensile Length (MPa) | 205 | 218 | 221 |
| Flexural Strength (MPa) | 246 | 252 | 267 |
| Heat distortion temperature (. degree. C.) | ＞300℃ | ＞300℃ | ＞300℃ |
As shown in the table, the tensile strength of the plastic pipe prepared by the invention can reach 221MPa, the bending strength is 267MPa, and the thermal deformation temperature is more than 300 ℃.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. A plastic pipe fitting suitable for engineering machinery is characterized by comprising a circular pipe section and a polygonal pipe section; the cross section of the polygonal pipe section is a regular polygon; the section of the circular pipe section is circular; the circular pipe section and the polygonal pipe section are integrally arranged;
the plastic pipe fitting is made of modified plastic materials by a molding processing method;
the preparation method of the modified plastic material comprises the following steps:
firstly, preparing hexamethylene diamine adipate by using hexamethylene diamine and adipic acid; compounding hexamethylene diamine adipate with glycinamide hydrochloride and terephthalic acid to obtain a modified plastic material;
the specific preparation method of the modified plastic material comprises the following steps:
s1, weighing 23.24g of hexamethylenediamine, adding the hexamethylenediamine into 50mL of deionized water, uniformly stirring, adding 29.23g of adipic acid, uniformly stirring again, heating to 60 ℃, reacting for 3 hours, adjusting the pH value of the solution to be 7.7-8 to obtain a hexamethylenediamine adipate solution, performing suction filtration to obtain a solid, and drying in a vacuum drying oven to obtain the hexamethylenediamine adipate; wherein the stirring speed is 100-200 rpm;
s2, weighing 11.0g of glycinamide hydrochloride, 10.8g of terephthalic acid and 0.48g of benzoic acid, adding 150mL of deionized water, uniformly stirring, adding hexamethylene diamine adipate, and uniformly stirring again to obtain a mixture A; wherein the addition amount of the hexamethylene diamine adipate is 30-80% of the mass of the glycyl amine hydrochloride;
s3, placing the mixture A in a reaction kettle, filling helium into the reaction kettle to reduce the pressure to 0.1-0.5 MPa, starting to heat and stirring; wherein the stirring speed is 200-300 rpm; the heating rate is 5-10 ℃/min;
s4, increasing the pressure in the reaction kettle along with the generation of the water vapor, starting to exhaust when the pressure reaches 1.5Mpa until the temperature is increased to 250-300 ℃, closing to exhaust, and keeping the temperature to react for 2-5 h to obtain a mixture B; wherein the exhaust rate is 2-3 kg/h;
and S5, feeding the cooled mixture B into a double-screw extruder for melt extrusion, cooling and granulating to obtain the modified plastic material.
2. The plastic pipe fitting for the engineering machinery as claimed in claim 1, wherein the polygonal pipe section is used for fixing a valve; the circular pipe section is used for fixedly connecting with a pipeline.
3. The plastic pipe fitting for construction machinery as claimed in claim 1, wherein the polygonal pipe section has a cross section of one of a regular hexagon, a regular octagon, a regular decagon and a regular dodecagon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033726.4A CN110748734B (en) | 2019-10-28 | 2019-10-28 | Plastic pipe fitting suitable for engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033726.4A CN110748734B (en) | 2019-10-28 | 2019-10-28 | Plastic pipe fitting suitable for engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110748734A CN110748734A (en) | 2020-02-04 |
| CN110748734B true CN110748734B (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911033726.4A Active CN110748734B (en) | 2019-10-28 | 2019-10-28 | Plastic pipe fitting suitable for engineering machinery |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200999938Y (en) * | 2007-01-31 | 2008-01-02 | 从化市聚宝龙工程塑料有限公司 | Pipe fitting with engineering plastics insert piece |
| CN201069030Y (en) * | 2007-02-02 | 2008-06-04 | 郝源增 | Novel plastic insert for plastic pipe fitting |
| WO2012116403A1 (en) * | 2011-03-03 | 2012-09-07 | Gsa Industries (Aust.) Pty. Ltd. | A pipe coupling |
| MY196485A (en) * | 2015-12-28 | 2023-04-17 | Victaulic Co Of America | Adapter Coupling |
| CN109401291A (en) * | 2017-08-16 | 2019-03-01 | 上海杰事杰新材料(集团)股份有限公司 | A kind of high-strength light high temperature resistant heat insulation nylon composite materials and preparation method thereof |
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Effective date of registration: 20220712 Address after: 221125 Tashan town Xia Zhuang village, Jiawang District, Xuzhou City, Jiangsu Province Patentee after: XUAZHOU HEIBAILONG ENGINEERING NYLON Co.,Ltd. Address before: 221300 No. 1 Xincun Road, Tushan Town Industrial Park, Pizhou City, Jiangsu Province Patentee before: Xuzhou Langui Machinery Technology Co.,Ltd. |