CN117601456B - Processing technology of large-caliber electric melting type plastic pipe fitting - Google Patents
Processing technology of large-caliber electric melting type plastic pipe fitting Download PDFInfo
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- CN117601456B CN117601456B CN202410085719.3A CN202410085719A CN117601456B CN 117601456 B CN117601456 B CN 117601456B CN 202410085719 A CN202410085719 A CN 202410085719A CN 117601456 B CN117601456 B CN 117601456B
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- Prior art keywords
- reaction kettle
- pipe fitting
- temperature
- carrying
- pipe
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- 229920003023 plastic Polymers 0.000 title claims abstract description 45
- 239000004033 plastic Substances 0.000 title claims abstract description 45
- 238000002844 melting Methods 0.000 title claims abstract description 36
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 title claims abstract description 19
- 238000005516 engineering process Methods 0.000 title claims abstract description 15
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 33
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 24
- -1 polyethylene chain Polymers 0.000 claims abstract description 21
- 238000005485 electric heating Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 187
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 102
- 239000000654 additive Substances 0.000 claims description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 48
- 230000000996 additive effect Effects 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 229920000573 polyethylene Polymers 0.000 claims description 38
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 36
- 238000004321 preservation Methods 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 35
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 33
- 238000000502 dialysis Methods 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 26
- 239000002904 solvent Substances 0.000 claims description 26
- 239000002131 composite material Substances 0.000 claims description 22
- 239000003054 catalyst Substances 0.000 claims description 19
- 239000003607 modifier Substances 0.000 claims description 19
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 18
- DCFKHNIGBAHNSS-UHFFFAOYSA-N chloro(triethyl)silane Chemical compound CC[Si](Cl)(CC)CC DCFKHNIGBAHNSS-UHFFFAOYSA-N 0.000 claims description 18
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 18
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 18
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 17
- 239000007853 buffer solution Substances 0.000 claims description 16
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 14
- 230000003213 activating effect Effects 0.000 claims description 13
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 13
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 13
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical group [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 11
- JMCRDEBJJPRTPV-OWOJBTEDSA-N (e)-ethene-1,2-diol Chemical group O\C=C\O JMCRDEBJJPRTPV-OWOJBTEDSA-N 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 9
- 229960003638 dopamine Drugs 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 9
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical group C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 8
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012043 crude product Substances 0.000 claims description 6
- 235000019253 formic acid Nutrition 0.000 claims description 6
- MDRZSADXFOPYOC-UHFFFAOYSA-N hepta-2,4-dien-1-ol Chemical compound CCC=CC=CCO MDRZSADXFOPYOC-UHFFFAOYSA-N 0.000 claims description 6
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 6
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical group CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 5
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 5
- 229960000281 trometamol Drugs 0.000 claims description 5
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 claims description 3
- 229940063655 aluminum stearate Drugs 0.000 claims description 3
- 239000012943 hotmelt Substances 0.000 claims description 3
- 235000019359 magnesium stearate Nutrition 0.000 claims description 3
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 2
- 125000002883 imidazolyl group Chemical group 0.000 claims description 2
- 229940057948 magnesium stearate Drugs 0.000 claims description 2
- 238000012805 post-processing Methods 0.000 claims description 2
- 229940114930 potassium stearate Drugs 0.000 claims description 2
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 claims description 2
- 229940080350 sodium stearate Drugs 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 abstract description 15
- 238000009413 insulation Methods 0.000 abstract description 13
- 230000004927 fusion Effects 0.000 abstract description 10
- 238000004132 cross linking Methods 0.000 abstract description 3
- 230000009257 reactivity Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000012065 filter cake Substances 0.000 description 32
- 238000005303 weighing Methods 0.000 description 30
- 238000001035 drying Methods 0.000 description 27
- 239000008213 purified water Substances 0.000 description 20
- 238000000967 suction filtration Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 13
- 238000005406 washing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XTJLXXCARCJVPJ-TWTPFVCWSA-N (2e,4e)-hepta-2,4-diene Chemical group CC\C=C\C=C\C XTJLXXCARCJVPJ-TWTPFVCWSA-N 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 150000002513 isocyanates Chemical group 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a processing technology of a large-caliber electric melting type plastic pipe fitting, and belongs to the technical field of plastic pipe fitting processing. The invention is used for solving the technical problems that the connection strength and the tightness between a large-caliber pipeline and a connecting pipe fitting in the prior art are to be further improved and the welding process of the large-caliber plastic pipe fitting is to be further optimized and improved, and the processing process of the large-caliber electric heating melting type plastic pipe fitting comprises the following steps: adding the mixture into a pipe extruder, and performing melt extrusion to obtain the HDPE thick-wall pipe with the inner diameter of 254-256mm and the thickness of 60-70 mm. The invention not only effectively simplifies the pipeline welding process, but also improves the heat conduction and insulation properties of the fusion layer by optimizing the composition of the castable, so that the contact surface of the PE pipe and the electric heating fusion pipe can be heated uniformly, and the mutual crosslinking between polyethylene chain segments is promoted by improving the reactivity of the fusion layer, and the bonding strength and the sealing property between the electric heating fusion pipe and the PE pipe are improved.
Description
Technical Field
The invention relates to the technical field of plastic pipe fitting processing, in particular to a processing technology of a large-caliber electric melting type plastic pipe fitting.
Background
With the acceleration of the urban process and the continuous perfection of infrastructure construction, the plastic pipe is widely applied in the fields of water supply and drainage, gas transportation and the like. Especially large caliber plastic pipes, market demand continues to grow due to their excellent durability, portability and cost effectiveness. However, the processing technology of the large-caliber plastic pipe with the diameter larger than 200mm has a certain technical bottleneck, such as the problems of connection strength, production efficiency and the like, and needs to be improved.
In the prior art, when large-caliber plastic pipes with the diameters larger than 200mm are subjected to butt welding, different forming dies are required to be developed and designed according to the pipe diameters of the plastic pipes, in the traditional electric hot melting welding process, the plastic pipes to be welded and the connecting pipe fittings are required to be quickly butted together in a short time after being heated and melted by the dies, in the butt welding process, the melting degree of the plastic pipes and the connecting pipe fittings, the depth of the plastic pipes extending into the connecting pipe fittings, the levelness of the connecting pipe fittings relative to the plastic pipes and the like are not controlled stably, so that the connecting strength and the tightness of the connecting part of the connecting pipe fittings and the plastic pipes are poor after the conventional large-caliber plastic pipes are welded, the welding part of the connecting pipe fittings is easy to be damaged and leaked when the pipeline bears internal pressure, and the welding process of the large-caliber plastic pipes needs to be further optimized and improved.
In view of the technical drawbacks of this aspect, a solution is now proposed.
Disclosure of Invention
The invention aims to provide a processing technology of a large-caliber electric melting type plastic pipe fitting, which is used for solving the technical problems that the connection strength and the tightness between a plastic pipe and a connecting pipe fitting are poor when the large-caliber plastic pipe fitting is in butt joint, the welding part of the connecting pipe fitting is easy to be damaged and leaked when a pipeline bears internal pressure, and the welding technology of the large-caliber plastic pipe fitting needs to be further optimized and improved.
The aim of the invention can be achieved by the following technical scheme:
a processing technology of a large-caliber electric melting type plastic pipe fitting comprises the following steps:
s1, adding the mixture into a pipe extruder, and performing melt extrusion to obtain an HDPE thick-wall pipe with the inner diameter of 254-256mm and the thickness of 60-70 mm;
s2, turning the HDPE thick-wall pipe into segment pipe blanks with different design lengths;
s3, embedding the heating resistance wire into the inner side wall of the pipe fitting blank, and sleeving a die on the inner wall of the pipe fitting blank with the heating resistance wire embedded in the inner wall, wherein a pouring cavity is formed between the outer wall of the die and the pipe fitting blank;
s4, adding high-density polyethylene powder, a heat conduction additive, a compatilizer, an auxiliary additive, a catalyst and toluene into a reaction kettle, raising the temperature of the reaction kettle to 75-85 ℃, stirring until the system is dissolved, evaporating the solvent under reduced pressure, and defoaming under negative pressure to obtain a castable;
s4, adding the castable into a casting cavity, cooling and forming, forming a welding layer with the thickness of 3-5mm on the inner wall of the pipe blank, and demolding to obtain the electric melting pipe.
Further, the mixture in the step S1 consists of high-density polyethylene, an antioxidant, a stabilizer, a filler and an anti-UV agent according to the weight ratio of 100:1.6-2.2:1.2-2:4-5:0.6-0.9, the model of the high-density polyethylene is HDPE5000S, the antioxidant is antioxidant 1010, the stabilizer is one or more of magnesium stearate, sodium stearate, aluminum stearate and potassium stearate, the filler consists of calcium carbonate and calcium silicate according to the weight ratio of 1:2, and the anti-UV agent is 2, 6-di-tert-butyl-p-cresol; the dosage ratio of the high-density polyethylene powder, the heat-conducting additive, the compatilizer, the auxiliary additive, the catalyst and the toluene in the step S4 is 10g:2g:4g:5g:1g:80mL, the model of the high-density polyethylene is HDPE5000S, the catalyst is dicumyl peroxide, and the compatilizer is EVA.
Further, the heat conduction additive is prepared by the following steps:
a1, adding graphite powder and an activating solution into a reaction kettle, raising the temperature of the reaction kettle to 70-80 ℃, carrying out heat preservation treatment for 40-60min, and carrying out post-treatment to obtain activated graphite;
a2, adding activated graphite, aluminum sulfate and a buffer solution into a reaction kettle, stirring until the system is dissolved, heating the reaction kettle to 80-90 ℃, carrying out heat preservation reaction for 4-6 hours, and carrying out post treatment to obtain modified graphite;
a3, placing the modified graphite into a tube furnace, setting the temperature of the tube furnace to be 600-700 ℃, carrying out heat preservation treatment for 3-5h, and cooling and discharging to obtain composite alumina;
a4, adding composite alumina, dopamine and deionized water into a reaction kettle, adding tromethamine into the reaction kettle, adjusting the pH value of the system to be 8.5, stirring at room temperature for reacting for 20-22 hours, and performing post-treatment to obtain modified alumina;
and A5, adding the modified alumina, toluene and the modifier into a nitrogen-protected anhydrous reaction kettle, stirring, heating the reaction kettle to 55-65 ℃, carrying out heat preservation reaction for 2-3h, and carrying out post-treatment to obtain the heat conduction additive.
Further, in the step A1, the activating solution is composed of 7-8mol/L sulfuric acid and 25wt% hydrogen peroxide according to a volume ratio of 5:1, the dosage ratio of the graphite powder to the activating solution is 1g:18mL, and the post-treatment operation comprises: after the reaction is finished, the temperature of the reaction kettle is reduced to room temperature, suction filtration is carried out, a filter cake is washed to be neutral by purified water and then is dried, the filter cake is transferred into a drying oven with the temperature of 70-80 ℃ and is dried to constant weight, and activated graphite is obtained; the preparation method of the buffer solution in the step A2 comprises the following steps: adding ammonium formate and deionized water into a reaction kettle, stirring until a system is dissolved, adding formic acid into the reaction kettle, and adjusting the pH=4.5 of the system to obtain a buffer solution, wherein the dosage ratio of the ammonium formate to the deionized water is 1g to 15mL, the dosage ratio of the activated graphite to the aluminum sulfate to the buffer solution is 1g to 3g to 25mL, and the post-treatment operation comprises: after the reaction is finished, the temperature of the reaction kettle is reduced to room temperature, suction filtration is carried out, a filter cake is washed for 3 times by purified water and absolute ethyl alcohol in sequence, the filter cake is transferred into a drying box with the temperature of 70-80 ℃, the drying is carried out to constant weight, and an uncoated graphite and modified graphite are separated by using a specific gravity separator, so that modified graphite is obtained; in the step A4, the dosage ratio of the composite alumina to the dopamine to the deionized water is 3g to 2g to 50mL, and the post-treatment operation comprises: after the reaction is finished, carrying out suction filtration, washing a filter cake with purified water for 3 times, transferring the filter cake into a drying oven with the temperature of 60-70 ℃, and carrying out vacuum drying to constant weight to obtain modified alumina; in the step A5, the dosage ratio of the modified alumina, the toluene and the modifier is 2g to 10mL to 1g, and the post-treatment operation comprises: after the reaction is finished, the temperature of the reaction kettle is reduced to room temperature, suction filtration is carried out, a filter cake is dried after being rinsed by toluene, the filter cake is transferred into a drying oven with the temperature of 65-75 ℃ and is dried to constant weight, and the heat conduction additive is obtained.
Further, the preparation method of the modifier comprises the following steps: adding isophorone diisocyanate and toluene into a nitrogen-protected anhydrous reaction kettle, stirring, adding 2, 4-heptadiene-1-ol into the reaction kettle, heating the reaction kettle to 60-70 ℃, preserving heat, reacting for 3-5h, and post-treating to obtain the modifier.
Further, the dosage ratio of the 2, 4-heptadiene-1-alcohol to the isophorone diisocyanate is 1mol to 1mol, and the dosage ratio of the isophorone diisocyanate to the toluene is 1g:5mL, the post-processing operation comprising: after the reaction is completed, the temperature of the reaction kettle is increased to 70-80 ℃, and toluene is distilled off under reduced pressure to obtain the modifier.
Further, the preparation method of the auxiliary additive comprises the following steps: adding ethylene polymer and N, N-dimethylformamide into a nitrogen-protected anhydrous reaction kettle, stirring, adding isophorone diisocyanate into the reaction kettle, raising the temperature of the reaction kettle to 75-85 ℃, carrying out heat preservation reaction for 2-3h, adding hydroxyl-terminated polydimethylsiloxane into the reaction kettle, carrying out heat preservation reaction for 3-5h, and carrying out post-treatment to obtain the auxiliary additive.
Further, the ethylene polymer, N-dimethylformamide, isophorone diisocyanate, and hydroxyl-terminated polydimethylsiloxane were used in an amount ratio of 5g:30mL:1g:4.8g, and the post-treatment operation included: after the reaction is completed, the temperature of the reaction kettle is increased to 80-90 ℃, and the solvent is distilled off under reduced pressure to obtain the auxiliary additive.
Further, the ethylene polymer is processed by the following steps:
b1, adding 1, 2-dihydroxyethylene, triethylchlorosilane, N-dimethylformamide and a catalyst into a reaction kettle, stirring, heating the reaction kettle to 65-75 ℃, and carrying out heat preservation reaction for 12-16 hours to obtain post-treated modified ethylene;
adding modified ethylene, tetrahydrofuran and a catalyst into a reaction kettle, raising the temperature of the reaction kettle to slightly reflux the system, reacting for 6-8h at a constant temperature, and performing post-treatment to obtain an ethylene polymer crude product;
and B3, adding the crude ethylene polymer into a dialysis bag, immersing the dialysis bag into tetrahydrofuran solution for dialysis, replacing tetrahydrofuran every 4-6 hours, immersing for dialysis for 20-22 hours, and performing post-treatment to obtain the ethylene polymer.
Further, in the step B1, the dosage ratio of the 1, 2-dihydroxyethylene to the triethylchlorosilane is 1mol to 2mol, the dosage ratio of the 1, 2-dihydroxyethylene to the N, N-dimethylformamide to the catalyst is 1g to 5mL to 0.05g, the catalyst is imidazole, and the post-treatment operation comprises: after the reaction is finished, the temperature of the three-neck flask is increased to 85-95 ℃, the solvent is distilled off under reduced pressure, the temperature of the reaction kettle is reduced to room temperature, toluene and purified water are added into the reaction kettle, stirring is carried out for 30-50min at room temperature, standing and liquid separation are carried out, an organic phase is transferred to a rotary evaporator after being washed for three times by the purified water, the water bath temperature is set to 70-80 ℃, and the solvent is distilled off under reduced pressure, so that modified ethylene is obtained; in the step B2, the dosage ratio of the modified ethylene to the tetrahydrofuran to the catalyst is 3g to 10mL to 0.1g, the catalyst is sodium methoxide, and the post-treatment operation comprises: after the reaction is completed, the heat preservation system of the reaction kettle is subjected to micro-reflux, and the solvent is distilled off under reduced pressure to obtain an ethylene polymer crude product; the molecular weight of the cut-off of the dialysis bag in the step B3 is 1000, and the post-treatment operation comprises the following steps: after the dialysis is completed, transferring the solution in the dialysis bag into a rotary evaporator, setting the water bath temperature to be 50-60 ℃, and evaporating the solvent under reduced pressure to obtain the ethylene polymer.
The invention has the following beneficial effects:
1. according to the large-caliber electric heating melting type plastic pipe fitting, the antioxidant, the stabilizer, the filler and the UV-resistant agent are added into the high-density polyethylene, the dosage proportion among the components is controlled, the thermal stability of the HDPE thick-wall pipe under a high-temperature environment can be effectively improved, the heating resistance wire is embedded into the inner wall of the HDPE thick-wall pipe, the heating resistance wire is coated through the fusion layer poured by the castable, the electric heating pipe with the fusion layer is formed, when the large-caliber PE pipe fitting is welded, the electric heating resistance wire is electrified, the electric heating melting pipe and the PE pipe can be heated, the fusion layer, the inner wall of a pipe fitting blank and the outer wall of the PE pipe are melted, the electric heating melting pipe and the PE pipe are promoted to be connected, further the development cost of a high-volume forming die is avoided, the installation process of the large-caliber PE pipe is simplified, and the large-caliber PE pipe is more convenient to install.
2. According to the castable for the large-caliber electric melting plastic pipe fitting, the composite alumina is prepared by coating graphite powder with alumina, the composite alumina is modified by dopamine, the surface activity of the alumina is improved, and the modified alumina is treated by a modifier to obtain the heat conduction additive with 2, 4-heptadiene chain segment coating modification, so that the dispersibility of the heat conduction additive in high-density polyethylene is improved; the heat conduction additive, the auxiliary additive with the ethylene polymer and the polydimethylsiloxane composite chain segment, EVA, dicumyl peroxide and high-density polyethylene are dissolved and mixed to promote uniform mixing of the components, so that the castable is obtained, the heat conduction inside the material is improved by utilizing the high heat conduction performance and the insulating performance of the heat conduction additive, so that heat is more effectively transferred, the heat conduction performance of a welding layer is improved, the insulating performance of the welding layer is improved, and the heating resistance wire is prevented from being shorted, so that the heating resistance wire cannot work normally; the auxiliary additive and EVA with the ethylene polymer and polydimethylsiloxane composite chain segments can improve the compatibility between the high-density polyethylene and other components, enhance the interfacial adhesion and the like, improve the heat conduction performance of a fusion layer by improving the interfacial interaction and increasing the heat conduction path, and break olefinic double bonds on the heat conduction additive and the auxiliary additive to form free radicals under the action of dicumyl peroxide as an initiator so as to promote the cross-linking and bonding between polyethylene chains to form a larger polymer network structure and improve the bonding strength and the sealing performance between PE pipes and electric-melting plastic pipes.
3. According to the castable for the large-caliber electric melting plastic pipe fitting, the graphite powder is subjected to activation treatment through the activating solution composed of sulfuric acid and hydrogen peroxide, hydrogen peroxide is used as an oxidant, in an acidic environment, the layer structure of graphite is promoted to be opened, the surface activity and the surface roughness of graphite are increased, the hydrophilic performance of activated graphite is improved, activated graphite reacts with aluminum sulfate in the buffer solution composed of ammonium formate/formic acid, aluminum sulfate is hydrolyzed in the buffer solution to form aluminum ions and then reacts with the surface active functional groups or water of the activated graphite to form aluminum salt coating, the modified graphite with the aluminum salt coating is prepared, the aluminum salt is converted into aluminum oxide through high-temperature oxidation calcination of a tubular furnace, the aluminum oxide coating is formed on the surface of the graphite, the heat conducting performance of the aluminum oxide is effectively improved, meanwhile, the aluminum oxide is an unfavorable conductor, and the insulating performance of a welding layer is improved; the isocyanate group on isophorone diisocyanate reacts with the alcohol hydroxyl group of 2, 4-heptadiene-1-alcohol to prepare the isocyanate group-terminated modifier, and the modifier reacts with the dopamine layer on the surface of the composite alumina to form the heat conduction additive with a large number of olefin double bonds coating the modified alumina, so that the reactivity of the heat conduction additive is improved.
4. According to the castable for the large-caliber electric melting plastic pipe fitting, 1, 2-dihydroxyethylene and triethylchlorosilane are used as raw materials, active hydrogen on hydroxyl groups of the 1, 2-dihydroxyvinyl alcohol and halogen on the triethylchlorosilane are subjected to substitution addition reaction under the condition of taking imidazole as a catalyst to form triethylsiloxane terminated modified ethylene, siloxane bonds on the modified ethylene are disconnected and recombined under catalysis of sodium methoxide to form hydroxyl terminated ethylene polymer, the ethylene polymer with the molecular weight of about 1000 is obtained through dialysis screening of dialysis bags, the ethylene polymer and isophorone diisocyanate are subjected to precondensation reaction to form a prepolymer, and the hydroxy terminated polydimethylsiloxane is used as a chain extender to prepare an auxiliary additive with an ethylene polymer and polydimethylsiloxane composite chain segment, wherein the polydimethylsiloxane in the auxiliary additive has good heat conducting property and can be used as a heat conducting channel, so that heat transfer is promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall perspective structure of a large caliber electric hot melt plastic pipe fitting of the present invention;
FIG. 2 is a schematic cross-sectional view of a large caliber electric hot melt plastic pipe of the present invention.
In the figure: 100. a pipe blank; 200. a fusion layer; 300. a heating resistance wire; 301. a heat insulation sleeve.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the embodiment provides a preparation method of a castable for a large-caliber electric melting type plastic pipe fitting, which comprises the following steps:
s1, preparing composite aluminum oxide:
adding 7mol/L sulfuric acid and 25wt% hydrogen peroxide into a beaker according to a volume ratio of 5:1, and uniformly mixing to obtain an activating solution for later use;
weighing: adding 50g of graphite powder and 900mL of activating solution into a reaction kettle, raising the temperature of the reaction kettle to 70 ℃, carrying out heat preservation treatment for 40min, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water to be neutral, then carrying out suction drying, transferring the filter cake into a drying oven with the temperature of 70 ℃, and drying to constant weight to obtain activated graphite;
adding ammonium formate and deionized water into a reaction kettle according to the dosage ratio of 1g to 15mL, stirring until the system is dissolved, adding formic acid into the reaction kettle, and regulating the pH value of the system to be 4.5 to obtain a buffer solution for later use;
weighing: adding 50g of activated graphite, 150g of aluminum sulfate and 1250mL of buffer solution into a reaction kettle, stirring until the system is dissolved, raising the temperature of the reaction kettle to 80 ℃, preserving heat and reacting for 4 hours, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water and absolute ethyl alcohol for 3 times in sequence, transferring the filter cake into a drying box with the temperature of 70 ℃, drying to constant weight, and separating uncoated graphite from modified graphite by using a specific gravity separator to obtain modified graphite;
placing the modified graphite into a tube furnace, setting the temperature of the tube furnace to be 600 ℃, carrying out heat preservation treatment for 3 hours, cooling and discharging to obtain the composite alumina.
S2, preparing a heat conduction additive:
weighing: adding 60g of composite alumina, 40g of dopamine and 1000mL of deionized water into a reaction kettle, adding tromethamine into the reaction kettle, adjusting the pH value of the system to be 8.5, stirring at room temperature for reaction for 20 hours, carrying out suction filtration, washing a filter cake with purified water for 3 times, transferring the filter cake into a drying box with the temperature of 60 ℃, and carrying out vacuum drying to constant weight to obtain modified alumina;
weighing: 88.8g of isophorone diisocyanate and 4444mL of toluene are added into a nitrogen-protected anhydrous reaction kettle, and the mixture is stirred, 22.4g of 2, 4-heptadiene-1-ol is added into the reaction kettle, after the addition is finished, the temperature of the reaction kettle is increased to 60 ℃, the reaction is carried out for 3 hours, the temperature of the reaction kettle is increased to 70 ℃, and the toluene is distilled off under reduced pressure to obtain a modifier;
weighing: 60g of modified alumina, 300mL of toluene and 30g of modifier are added into a nitrogen-protected anhydrous reaction kettle, the mixture is stirred, the temperature of the reaction kettle is increased to 55 ℃, the reaction is carried out for 2 hours under the heat preservation, the temperature of the reaction kettle is reduced to room temperature, the mixture is filtered, a filter cake is leached by toluene and then is pumped to dryness, and the filter cake is transferred into a drying box with the temperature of 65 ℃ and is dried to constant weight, so that the heat conduction additive is obtained.
S3, preparing an ethylene polymer:
weighing: 60.05g of 1, 2-dihydroxyethylene, 301.44g of triethylchlorosilane, 300.25mL of N, N-dimethylformamide and 3.0g of imidazole are added into a reaction kettle for stirring, the temperature of the reaction kettle is increased to 65 ℃, the reaction is carried out for 12 hours in a heat preservation way, the temperature of a three-neck flask is increased to 85 ℃, the solvent is distilled off under reduced pressure, the temperature of the reaction kettle is reduced to room temperature, toluene and purified water are added into the reaction kettle, stirring is carried out for 30 minutes at room temperature, standing and liquid separation are carried out, the organic phase is transferred into a rotary evaporator after being washed for three times by the purified water, the water bath temperature is set to 70 ℃, and the solvent is distilled off under reduced pressure, thus obtaining the modified ethylene;
weighing: adding 60g of modified ethylene, 200mL of tetrahydrofuran and 2g of sodium methoxide into a reaction kettle, raising the temperature of the reaction kettle to slightly reflux the system, carrying out heat preservation reaction for 6h, carrying out heat preservation reaction on the slightly reflux system of the reaction kettle, and carrying out reduced pressure distillation to remove a solvent to obtain an ethylene polymer crude product;
adding the crude ethylene polymer into a dialysis bag with the molecular weight of 1000, immersing the dialysis bag into tetrahydrofuran solution for dialysis, replacing tetrahydrofuran every 4 hours, immersing for dialysis for 20 hours, transferring the solution in the dialysis bag into a rotary evaporator, setting the water bath temperature to be 50 ℃, and evaporating the solvent under reduced pressure to obtain the ethylene polymer.
S4, preparing auxiliary additives:
weighing: adding 100g of ethylene polymer and 600mL of N, N-dimethylformamide into a nitrogen-protected anhydrous reaction kettle, stirring, adding 20g of isophorone diisocyanate into the reaction kettle, raising the temperature of the reaction kettle to 75 ℃, preserving heat for 2 hours, adding 96g of hydroxyl-terminated polydimethylsiloxane into the reaction kettle, preserving heat for 3 hours, raising the temperature of the reaction kettle to 80 ℃, and evaporating the solvent under reduced pressure to obtain the auxiliary additive.
S5, preparing castable:
weighing: 500g of high-density polyethylene powder with the model of HDPE5000S, 100g of heat conduction additive, 200g of EVA, 250g of auxiliary additive, 50g of dicumyl peroxide and 4000mL of toluene are added into a reaction kettle, the temperature of the reaction kettle is increased to 75 ℃, the mixture is stirred until the system is dissolved, the solvent is distilled off under reduced pressure, and the negative pressure is defoamed, so that the castable is obtained.
Example 2:
the embodiment provides a preparation method of a castable for a large-caliber electric melting type plastic pipe fitting, which comprises the following steps:
s1, preparing composite aluminum oxide:
adding 7.5mol/L sulfuric acid and 25wt% hydrogen peroxide into a beaker according to a volume ratio of 5:1, and uniformly mixing to obtain an activating solution for later use;
weighing: adding 50g of graphite powder and 900mL of activating solution into a reaction kettle, raising the temperature of the reaction kettle to 75 ℃, carrying out heat preservation treatment for 50min, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water to be neutral, then carrying out suction drying, transferring the filter cake into a drying oven with the temperature of 75 ℃, and drying to constant weight to obtain activated graphite;
adding ammonium formate and deionized water into a reaction kettle according to the dosage ratio of 1g to 15mL, stirring until the system is dissolved, adding formic acid into the reaction kettle, and regulating the pH value of the system to be 4.5 to obtain a buffer solution for later use;
weighing: adding 50g of activated graphite, 150g of aluminum sulfate and 1250mL of buffer solution into a reaction kettle, stirring until the system is dissolved, raising the temperature of the reaction kettle to 85 ℃, preserving heat and reacting for 5 hours, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water and absolute ethyl alcohol for 3 times in sequence, transferring the filter cake into a drying box with the temperature of 75 ℃, drying to constant weight, and separating uncoated graphite from modified graphite by using a specific gravity separator to obtain modified graphite;
and (3) placing the modified graphite into a tube furnace, setting the temperature of the tube furnace to 650 ℃, carrying out heat preservation treatment for 3.5h, and cooling and discharging to obtain the composite alumina.
S2, preparing a heat conduction additive:
weighing: adding 60g of composite alumina, 40g of dopamine and 1000mL of deionized water into a reaction kettle, adding tromethamine into the reaction kettle, adjusting the pH value of the system to be 8.5, stirring at room temperature for 21h, carrying out suction filtration, washing a filter cake with purified water for 3 times, transferring the filter cake into a drying box with the temperature of 65 ℃, and carrying out vacuum drying to constant weight to obtain modified alumina;
weighing: 88.8g of isophorone diisocyanate and 4444mL of toluene are added into a nitrogen-protected anhydrous reaction kettle, and the mixture is stirred, 22.4g of 2, 4-heptadiene-1-ol is added into the reaction kettle, the temperature of the reaction kettle is increased to 65 ℃ after the addition is finished, the reaction is carried out for 3.5 hours while the temperature of the reaction kettle is increased to 75 ℃, and the toluene is distilled off under reduced pressure to obtain a modifier;
weighing: 60g of modified alumina, 300mL of toluene and 30g of modifier are added into a nitrogen-protected anhydrous reaction kettle, the mixture is stirred, the temperature of the reaction kettle is increased to 60 ℃, the reaction is carried out for 2.5 hours under the heat preservation, the temperature of the reaction kettle is reduced to room temperature, the mixture is filtered by suction, a filter cake is leached by toluene and then is pumped to dryness, and the filter cake is transferred into a drying box with the temperature of 70 ℃ and is dried to constant weight, so that the heat conduction additive is obtained.
S3, preparing an ethylene polymer:
weighing: 60.05g of 1, 2-dihydroxyethylene, 301.44g of triethylchlorosilane, 300.25mL of N, N-dimethylformamide and 3.0g of imidazole are added into a reaction kettle for stirring, the temperature of the reaction kettle is increased to 70 ℃, the reaction is carried out for 14 hours in a heat preservation way, the temperature of a three-neck flask is increased to 90 ℃, the solvent is distilled off under reduced pressure, the temperature of the reaction kettle is reduced to room temperature, toluene and purified water are added into the reaction kettle, stirring is carried out for 40 minutes at room temperature, standing and liquid separation are carried out, an organic phase is transferred into a rotary evaporator after being washed for three times by the purified water, the water bath temperature is set to 75 ℃, and the solvent is distilled off under reduced pressure, thus obtaining the modified ethylene;
weighing: 60g of modified ethylene, 200mL of tetrahydrofuran and 2g of sodium methoxide are added into a reaction kettle, the temperature of the reaction kettle is increased to the slight reflux of the system, the reaction is carried out for 7h under the heat preservation, the slight reflux of the system is carried out under the heat preservation of the reaction kettle, and the solvent is distilled off under reduced pressure, thus obtaining an ethylene polymer crude product;
adding the crude ethylene polymer into a dialysis bag with the molecular weight of 1000, immersing the dialysis bag into tetrahydrofuran solution for dialysis, replacing tetrahydrofuran every 5 hours, immersing for dialysis for 21 hours, transferring the solution in the dialysis bag into a rotary evaporator, setting the water bath temperature to 55 ℃, and evaporating the solvent under reduced pressure to obtain the ethylene polymer.
S4, preparing auxiliary additives:
weighing: adding 100g of ethylene polymer and 600mL of N, N-dimethylformamide into a nitrogen-protected anhydrous reaction kettle, stirring, adding 20g of isophorone diisocyanate into the reaction kettle, raising the temperature of the reaction kettle to 80 ℃, carrying out heat preservation reaction for 2.5h, adding 96g of hydroxyl-terminated polydimethylsiloxane into the reaction kettle, carrying out heat preservation reaction for 4h, raising the temperature of the reaction kettle to 85 ℃, and carrying out reduced pressure distillation to remove the solvent to obtain the auxiliary additive.
S5, preparing castable:
weighing: 500g of high-density polyethylene powder with the model of HDPE5000S, 100g of heat conduction additive, 200g of EVA, 250g of auxiliary additive, 50g of dicumyl peroxide and 4000mL of toluene are added into a reaction kettle, the temperature of the reaction kettle is increased to 80 ℃, the mixture is stirred until the system is dissolved, the solvent is distilled off under reduced pressure, and the negative pressure is defoamed, so that the castable is obtained.
Example 3:
the embodiment provides a preparation method of a castable for a large-caliber electric melting type plastic pipe fitting, which comprises the following steps:
s1, preparing composite aluminum oxide:
adding 8mol/L sulfuric acid and 25wt% hydrogen peroxide into a beaker according to a volume ratio of 5:1, and uniformly mixing to obtain an activating solution for later use;
weighing: adding 50g of graphite powder and 900mL of activating solution into a reaction kettle, raising the temperature of the reaction kettle to 80 ℃, carrying out heat preservation treatment for 60min, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water to be neutral, then carrying out suction drying, transferring the filter cake into a drying oven with the temperature of 80 ℃, and drying to constant weight to obtain activated graphite;
adding ammonium formate and deionized water into a reaction kettle according to the dosage ratio of 1g to 15mL, stirring until the system is dissolved, adding formic acid into the reaction kettle, and regulating the pH value of the system to be 4.5 to obtain a buffer solution for later use;
weighing: adding 50g of activated graphite, 150g of aluminum sulfate and 1250mL of buffer solution into a reaction kettle, stirring until the system is dissolved, raising the temperature of the reaction kettle to 90 ℃, preserving heat and reacting for 6 hours, reducing the temperature of the reaction kettle to room temperature, carrying out suction filtration, washing a filter cake with purified water and absolute ethyl alcohol for 3 times in sequence, transferring the filter cake into a drying box with the temperature of 80 ℃, drying to constant weight, and separating uncoated graphite from modified graphite by using a specific gravity separator to obtain modified graphite;
and (3) placing the modified graphite into a tube furnace, setting the temperature of the tube furnace to be 700 ℃, carrying out heat preservation treatment for 4 hours, and cooling and discharging to obtain the composite alumina.
S2, preparing a heat conduction additive:
weighing: adding 60g of composite alumina, 40g of dopamine and 1000mL of deionized water into a reaction kettle, adding tromethamine into the reaction kettle, adjusting the pH value of the system to be 8.5, stirring at room temperature for reaction for 22 hours, carrying out suction filtration, washing a filter cake with purified water for 3 times, transferring the filter cake into a drying box with the temperature of 70 ℃, and carrying out vacuum drying to constant weight to obtain modified alumina;
weighing: 88.8g of isophorone diisocyanate and 4444mL of toluene are added into a nitrogen-protected anhydrous reaction kettle, and the mixture is stirred, 22.4g of 2, 4-heptadiene-1-ol is added into the reaction kettle, after the addition is finished, the temperature of the reaction kettle is increased to 70 ℃, the reaction is carried out for 4 hours, the temperature of the reaction kettle is increased to 80 ℃, and the toluene is distilled off under reduced pressure to obtain a modifier;
weighing: 60g of modified alumina, 300mL of toluene and 30g of modifier are added into a nitrogen-protected anhydrous reaction kettle, the mixture is stirred, the temperature of the reaction kettle is increased to 65 ℃, the reaction is carried out for 3 hours, the temperature of the reaction kettle is reduced to room temperature, suction filtration is carried out, a filter cake is leached by toluene and then is dried, the filter cake is transferred into a drying box with the temperature of 75 ℃, and the drying is carried out until the weight is constant, thus obtaining the heat conduction additive.
S3, preparing an ethylene polymer:
weighing: 60.05g of 1, 2-dihydroxyethylene, 301.44g of triethylchlorosilane, 300.25mL of N, N-dimethylformamide and 3.0g of imidazole are added into a reaction kettle for stirring, the temperature of the reaction kettle is increased to 75 ℃, the reaction is carried out for 16 hours in a heat preservation way, the temperature of a three-neck flask is increased to 95 ℃, the solvent is distilled off under reduced pressure, the temperature of the reaction kettle is reduced to room temperature, toluene and purified water are added into the reaction kettle, stirring is carried out for 50 minutes at room temperature, standing and liquid separation are carried out, an organic phase is transferred into a rotary evaporator after being washed for three times by the purified water, the water bath temperature is set to 80 ℃, and the solvent is distilled off under reduced pressure, thus obtaining the modified ethylene;
weighing: 60g of modified ethylene, 200mL of tetrahydrofuran and 2g of sodium methoxide are added into a reaction kettle, the temperature of the reaction kettle is increased to the slight reflux of the system, the reaction is carried out for 8 hours in a heat preservation way, the heat preservation system of the reaction kettle is carried out for slight reflux, and the solvent is distilled off under reduced pressure to obtain an ethylene polymer crude product;
adding the crude ethylene polymer into a dialysis bag with the molecular weight of 1000, immersing the dialysis bag into tetrahydrofuran solution for dialysis, replacing tetrahydrofuran every 6 hours, immersing for dialysis for 22 hours, transferring the solution in the dialysis bag into a rotary evaporator, setting the water bath temperature to be 60 ℃, and evaporating the solvent under reduced pressure to obtain the ethylene polymer.
S4, preparing auxiliary additives:
weighing: adding 100g of ethylene polymer and 600mL of N, N-dimethylformamide into a nitrogen-protected anhydrous reaction kettle, stirring, adding 20g of isophorone diisocyanate into the reaction kettle, raising the temperature of the reaction kettle to 85 ℃, carrying out heat preservation reaction for 3 hours, adding 96g of hydroxyl-terminated polydimethylsiloxane into the reaction kettle, carrying out heat preservation reaction for 5 hours, raising the temperature of the reaction kettle to 90 ℃, and carrying out reduced pressure distillation to remove the solvent to obtain the auxiliary additive.
S5, preparing castable:
weighing: 500g of high-density polyethylene powder with the model of HDPE5000S, 100g of heat conduction additive, 200g of EVA, 250g of auxiliary additive, 50g of dicumyl peroxide and 4000mL of toluene are added into a reaction kettle, the temperature of the reaction kettle is increased to 85 ℃, the mixture is stirred until the system is dissolved, the solvent is distilled off under reduced pressure, and the negative pressure is defoamed, so that the castable is obtained.
Example 4:
referring to fig. 1-2, the present embodiment provides a processing technology of a large-caliber electrothermal welding plastic pipe fitting, which includes the following steps:
s1, weighing: 1000g of high-density polyethylene with the model of HDPE5000S, 1010 g of antioxidant, 120g of magnesium stearate, 400g of filler and 60g of 2, 6-di-tert-butyl-p-cresol are uniformly mixed to obtain a mixture for standby, wherein the filler consists of calcium carbonate and calcium silicate according to the weight ratio of 1:2;
s2, adding the mixture into a pipe extruder, setting the extrusion temperature to be 215 ℃, and performing melt extrusion to obtain an HDPE thick-wall pipe with the inner diameter of 254mm and the thickness of 60 mm;
s3, turning the HDPE thick-wall pipe into segment pipe blanks 100 with different design lengths;
s4, spirally embedding the heating resistance wire 300 on the inner side wall of the pipe fitting blank 100, setting the interval between every two adjacent circles of heating resistance wires to be 10mm, sleeving heat insulation sleeves 301 at two ends of the pipe fitting blank 100, respectively penetrating the two heat insulation sleeves 301 at two ends of the heating resistance wire 300 to extend to the outside of the pipe fitting blank 100, sleeving a mold coaxially arranged with the inner wall of the pipe fitting blank 100, and forming a pouring cavity between the outer wall of the mold and the pipe fitting blank 100;
s5, adding the castable prepared in the embodiment 1 into a casting cavity, cooling and forming, forming a welding layer 200 with the thickness of 3mm on the inner wall of the pipe blank 100, and demolding to obtain the electric heating melting pipe.
Example 5:
referring to fig. 1-2, the present embodiment provides a processing technology of a large-caliber electrothermal welding plastic pipe fitting, which includes the following steps:
s1, weighing: 1000g of high-density polyethylene with the model of HDPE5000S, 1010 g of antioxidant, 180g of sodium stearate, 45g of filler and 75g of 2, 6-di-tert-butyl-p-cresol are uniformly mixed to obtain a mixture for standby, wherein the filler consists of calcium carbonate and calcium silicate according to the weight ratio of 1:2;
s2, adding the mixture into a pipe extruder, setting the extrusion temperature to 220 ℃, and performing melt extrusion to obtain an HDPE thick-wall pipe with the inner diameter of 255mm and the thickness of 65 mm;
s3, turning the HDPE thick-wall pipe into segment pipe blanks 100 with different design lengths;
s4, spirally embedding the heating resistance wire 300 on the inner side wall of the pipe fitting blank 100, setting the interval between every two adjacent circles of heating resistance wires to be 10mm, sleeving heat insulation sleeves 301 at two ends of the pipe fitting blank 100, respectively penetrating the two heat insulation sleeves 301 at two ends of the heating resistance wire 300 to extend to the outside of the pipe fitting blank 100, sleeving a mold coaxially arranged with the inner wall of the pipe fitting blank 100, and forming a pouring cavity between the outer wall of the mold and the pipe fitting blank 100;
s5, adding the castable prepared in the embodiment 2 into a casting cavity, cooling and forming, forming a welding layer 200 with the thickness of 5mm on the inner wall of the pipe blank 100, and demolding to obtain the electric heating melting pipe.
Example 6:
referring to fig. 1-2, the present embodiment provides a processing technology of a large-caliber electrothermal welding plastic pipe fitting, which includes the following steps:
s1, weighing: 1000g of high-density polyethylene with the model of HDPE5000S, 1010 g of antioxidant, 240g of aluminum stearate, 500g of filler and 90g of 2, 6-di-tert-butyl-p-cresol are uniformly mixed to obtain a mixture for standby, wherein the filler consists of calcium carbonate and calcium silicate according to the weight ratio of 1:2;
s2, adding the mixture into a pipe extruder, setting the extrusion temperature to 225 ℃, and performing melt extrusion to obtain an HDPE thick-wall pipe with the inner diameter of 256mm and the thickness of 70 mm;
s3, turning the HDPE thick-wall pipe into segment pipe blanks 100 with different design lengths;
s4, spirally embedding the heating resistance wire 300 on the inner side wall of the pipe fitting blank 100, setting the interval between every two adjacent circles of heating resistance wires to be 10mm, sleeving heat insulation sleeves 301 at two ends of the pipe fitting blank 100, respectively penetrating the two heat insulation sleeves 301 at two ends of the heating resistance wire 300 to extend to the outside of the pipe fitting blank 100, sleeving a mold coaxially arranged with the inner wall of the pipe fitting blank 100, and forming a pouring cavity between the outer wall of the mold and the pipe fitting blank 100;
s5, adding the castable prepared in the embodiment 3 into a casting cavity, cooling and forming, forming a welding layer 200 with the thickness of 5mm on the inner wall of the pipe blank 100, and demolding to obtain the electric heating melting pipe.
Comparative example 1:
this comparative example differs from example 6 in that the heat-conducting additive in step S5 was replaced by the composite alumina obtained in step S1 in equal amounts in the preparation of the castable.
Comparative example 2:
this comparative example differs from example 6 in that the auxiliary additive in step S5 was replaced by the hydroxy-terminated polydimethylsiloxane in step S3 in equal amounts in the preparation of the castable.
Comparative example 3:
the difference between this comparative example and example 6 is that EVA and dicumyl peroxide are not added in step S5 in the preparation of the castable.
Performance test:
testing the heat conduction performance and the insulation performance of a welding layer of the electric melting pipe prepared in the examples 4-6 and the comparative examples 1-3, respectively sleeving two PE pipes with DN250 at two ends of the electric melting pipe, connecting a heating resistance wire with a 220V circuit through a switch, keeping the power on for 1500s, disconnecting the power supply, and obtaining a test piece after the temperature of the electric melting pipe is reduced to room temperature, and testing the tightness and the welding strength of the test piece, wherein the heat conduction performance of the welding layer is measured according to the heat conduction performance test method of electric insulation materials of the standard GB/T29313-2012, the heat conduction coefficient and the heat resistance of the welding layer are measured according to the insulation performance reference standard GB/T11016.3-2009 plastic insulation and rubber insulation telephone cord part 3: the volume resistivity of the polypropylene insulated telephone soft wire at 20 ℃ of the welded layer is measured, the welding strength of the test piece is measured according to the standard DB 41/T1825-2019 polyethylene pipe welding process evaluation for gas, the maximum tensile force and the damage type of the test piece are measured, the tightness of the test piece is measured according to the standard DB 41/T1825-2019 polyethylene pipe welding process evaluation for gas, the pressure of the test piece is 5.4MPa, the test is 165 hours, the damage and the penetration phenomenon of the welded part of the joint of the test piece are observed, and the specific test results are shown in the following table:
data analysis:
by comparing and analyzing the data in the table, the heat conductivity coefficient of the fusion layer of the electric melting pipe prepared by the invention reaches 0.57W (m.k) -1 The thermal impedance reaches 98.9 (m) 2 ·k)·W -1 The volume resistivity reaches 2.61 multiplied by 1014 omega-m -1 The maximum tensile force of the welded test piece reaches 1.83 multiplied by 10 7 N, the tightness is good, the damage types are toughness damage, and all detection data are superior to those of comparative examples, and the castable for the welding layer of the test piece prepared by the invention not only effectively improves the heat conduction and insulation properties of the welding layer by optimizing the composition of the castable, so that the contact surface of the PE pipe and the electric heating melting pipe can be heated uniformly, but also improves the reactivity of the welding layer, and can promote the crosslinking between the electric heating melting pipe and the polyethylene chain segment on the PE pipe under a high-temperature environment, thereby improving the bonding strength and bonding tightness between the electric heating melting pipe and the PE pipe.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention as claimed, as it relates to various modifications, additions and substitutions for those skilled in the art, without departing from the inventive concept and without departing from the scope of the invention as defined in the accompanying claims.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. The processing technology of the large-caliber electric melting type plastic pipe fitting is characterized by comprising the following steps of:
s1, adding the mixture into a pipe extruder, and performing melt extrusion to obtain an HDPE thick-wall pipe with the inner diameter of 254-256mm and the thickness of 60-70 mm;
s2, turning the HDPE thick-wall pipe into segment pipe blanks (100) with different design lengths by turning;
s3, embedding the heating resistance wire (300) on the inner side wall of the pipe fitting blank (100), and sleeving a die on the inner wall of the pipe fitting blank (100) with the heating resistance wire (300) embedded in the inner wall, wherein a pouring cavity is formed between the outer wall of the die and the pipe fitting blank (100);
s4, adding high-density polyethylene powder, a heat-conducting additive, a compatilizer, an auxiliary additive, a catalyst and toluene into a reaction kettle, heating the reaction kettle to 75-85 ℃, stirring until the system is clear, evaporating the solvent under reduced pressure, and defoaming under negative pressure to obtain a castable, wherein the catalyst is dicumyl peroxide, and the compatilizer is EVA;
s5, adding the castable into a casting cavity, cooling and forming, forming a welding layer (200) with the thickness of 3-5mm on the inner wall of the pipe blank (100), and demolding to obtain the electric heating melting pipe;
the heat conduction additive is prepared by the following steps:
a1, adding graphite powder and an activating solution into a reaction kettle, raising the temperature of the reaction kettle to 70-80 ℃, carrying out heat preservation treatment for 40-60min, and carrying out post-treatment to obtain activated graphite;
a2, adding activated graphite, aluminum sulfate and a buffer solution into a reaction kettle, stirring until the system is dissolved, heating the reaction kettle to 80-90 ℃, carrying out heat preservation reaction for 4-6 hours, and carrying out post treatment to obtain modified graphite;
a3, placing the modified graphite into a tube furnace, setting the temperature of the tube furnace to be 600-700 ℃, carrying out heat preservation treatment for 3-5h, and cooling and discharging to obtain composite alumina;
a4, adding composite alumina, dopamine and deionized water into a reaction kettle, adding tromethamine into the reaction kettle, adjusting the pH value of the system to be 8.5, stirring at room temperature for reacting for 20-22 hours, and performing post-treatment to obtain modified alumina;
a5, adding the modified alumina, toluene and the modifier into a nitrogen-protected anhydrous reaction kettle, stirring, heating the reaction kettle to 55-65 ℃, carrying out heat preservation reaction for 2-3h, and carrying out post-treatment to obtain the heat conduction additive;
the preparation method of the modifier comprises the following steps: adding isophorone diisocyanate and toluene into a nitrogen-protected anhydrous reaction kettle, stirring, adding 2, 4-heptadiene-1-ol into the reaction kettle, heating the reaction kettle to 60-70 ℃, preserving heat, reacting for 3-5h, and post-treating to obtain a modifier;
the preparation method of the auxiliary additive comprises the following steps: adding an ethylene polymer and N, N-dimethylformamide into a nitrogen-protected anhydrous reaction kettle, stirring, adding isophorone diisocyanate into the reaction kettle, raising the temperature of the reaction kettle to 75-85 ℃, carrying out heat preservation reaction for 2-3h, adding hydroxyl-terminated polydimethylsiloxane into the reaction kettle, carrying out heat preservation reaction for 3-5h, and carrying out post-treatment to obtain an auxiliary additive;
wherein the ethylene polymer is processed by the following steps:
b1, adding 1, 2-dihydroxyethylene, triethylchlorosilane, N-dimethylformamide and a catalyst into a reaction kettle, stirring, heating the reaction kettle to 65-75 ℃, and carrying out heat preservation reaction for 12-16 hours to obtain post-treated modified ethylene;
adding modified ethylene, tetrahydrofuran and a catalyst into a reaction kettle, raising the temperature of the reaction kettle to slightly reflux the system, reacting for 6-8h at a constant temperature, and performing post-treatment to obtain an ethylene polymer crude product;
and B3, adding the crude ethylene polymer into a dialysis bag, immersing the dialysis bag into tetrahydrofuran solution for dialysis, replacing tetrahydrofuran every 4-6 hours, immersing for dialysis for 20-22 hours, and performing post-treatment to obtain the ethylene polymer.
2. The processing technology of the large-caliber electric melting plastic pipe fitting according to claim 1, wherein the mixture in the step S1 consists of high-density polyethylene, an antioxidant, a stabilizer, a filler and an anti-UV agent according to the weight ratio of 100:1.6-2.2:1.2-2:4-5:0.6-0.9, the model of the high-density polyethylene is HDPE5000S, the antioxidant is antioxidant 1010, the stabilizer is one or more of magnesium stearate, sodium stearate, aluminum stearate and potassium stearate, the filler consists of calcium carbonate and calcium silicate according to the weight ratio of 1:2, and the anti-UV agent is 2, 6-di-tert-butyl-p-cresol; the dosage ratio of the high-density polyethylene powder, the heat conduction additive, the compatilizer, the auxiliary additive, the catalyst and the toluene in the step S4 is 10g to 2g to 4g to 5g to 1g to 80mL, and the model of the high-density polyethylene is HDPE5000S.
3. The processing technology of the large-caliber electric hot melting plastic pipe fitting according to claim 1, wherein in the step A1, the activating solution consists of 7-8mol/L sulfuric acid and 25wt% hydrogen peroxide according to a volume ratio of 5:1, and the dosage ratio of the graphite powder to the activating solution is 1g:18mL; the preparation method of the buffer solution in the step A2 comprises the following steps: adding ammonium formate and deionized water into a reaction kettle, stirring until a system is dissolved, adding formic acid into the reaction kettle, and adjusting the pH=4.5 of the system to obtain a buffer solution, wherein the dosage ratio of the ammonium formate to the deionized water is 1g to 15mL, and the dosage ratio of the activated graphite to the aluminum sulfate to the buffer solution is 1g to 3g to 25mL; in the step A4, the dosage ratio of the composite alumina to the dopamine to the deionized water is 3g to 2g to 50mL; in the step A5, the dosage ratio of the modified alumina, the toluene and the modifier is 2g to 10mL to 1g.
4. The processing technology of the large-caliber electric hot melting plastic pipe fitting according to claim 1, wherein the dosage ratio of the 2, 4-heptadiene-1-ol to the isophorone diisocyanate is 1mol:1mol, and the dosage ratio of the isophorone diisocyanate to the toluene is 1g:5mL, the post-processing operation comprising: after the reaction is completed, the temperature of the reaction kettle is increased to 70-80 ℃, and toluene is distilled off under reduced pressure to obtain the modifier.
5. The process for processing a large-caliber electric hot melt plastic pipe fitting according to claim 1, wherein the dosage ratio of the ethylene polymer, the N, N-dimethylformamide, the isophorone diisocyanate and the hydroxyl-terminated polydimethylsiloxane is 5g:30mL:1g:4.8g.
6. The process for processing the large-caliber electric hot melting plastic pipe fitting according to claim 1, wherein in the step B1, the dosage ratio of 1, 2-dihydroxyethylene to triethylchlorosilane is 1mol:2mol, the dosage ratio of 1, 2-dihydroxyethylene to N, N-dimethylformamide to catalyst is 1g:5mL:0.05g, and the catalyst is imidazole; in the step B2, the dosage ratio of the modified ethylene to the tetrahydrofuran to the catalyst is 3g to 10mL to 0.1g, wherein the catalyst is sodium methoxide; the molecular weight of the cut-off of the dialysis bag in the step B3 is 1000, and the post-treatment operation comprises the following steps: after the dialysis is completed, transferring the solution in the dialysis bag into a rotary evaporator, setting the water bath temperature to be 50-60 ℃, and evaporating the solvent under reduced pressure to obtain the ethylene polymer.
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