阅读说明：本技术 一种耐腐蚀绝缘塑胶电力管及其制备工艺 (corrosion-resistant insulating plastic power tube and preparation process thereof ) 是由 阳志强 徐家壮 李忠明 李茂盛 梁丽 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种耐腐蚀绝缘塑胶电力管,为双层管,包括外层的CPVC管和内层的PP管；CPVC管由如下重量份原料制成：90-100份改性CPVC树脂、4-6份氯醋共聚物、1-2份丙烯酸酯类共聚物、2-3份玻璃纤维、1-2份石蜡、1-2份PE蜡、1-2份甲基锡热稳定剂、0.2-0.3份水滑石；PP管由聚丙烯树脂、增强填料和无水乙醇按照质量之比为10:0.6-0.8:13-15制成；本发明还公开了该塑胶电力管的制备工艺。本发明的塑胶电力管为双层管,外层为CPVC管,C内层为PP管,内层管材料和外层管材料通过一体化挤出方式成型,不仅能够保证电力管的成型稳定性和较强的耐剥离性,而且能够结合CPVC管和PP管的优点,使电力管具备较强的综合性能。(The invention discloses a corrosion-resistant insulating plastic power pipe which is a double-layer pipe and comprises a CPVC pipe at the outer layer and a PP pipe at the inner layer; the CPVC pipe is prepared from the following raw materials in parts by weight: 90-100 parts of modified CPVC resin, 4-6 parts of a vinyl chloride-vinyl acetate copolymer, 1-2 parts of an acrylate copolymer, 2-3 parts of glass fiber, 1-2 parts of paraffin wax, 1-2 parts of PE wax, 1-2 parts of a methyl tin heat stabilizer and 0.2-0.3 part of hydrotalcite; the PP pipe is made of polypropylene resin, a reinforcing filler and absolute ethyl alcohol according to the mass ratio of 10:0.6-0.8: 13-15; the invention also discloses a preparation process of the plastic power tube. The plastic power pipe is a double-layer pipe, the outer layer is a CPVC pipe, the C inner layer is a PP pipe, and the inner layer pipe material and the outer layer pipe material are molded in an integrated extrusion mode, so that the molding stability and the stronger peeling resistance of the power pipe can be ensured, and the advantages of the CPVC pipe and the PP pipe can be combined to ensure that the power pipe has stronger comprehensive performance.)

1. the corrosion-resistant insulating plastic power pipe is characterized by being a double-layer pipe and comprising a CPVC pipe at the outer layer and a PP pipe at the inner layer;

the CPVC pipe is prepared from the following raw materials in parts by weight: 90-100 parts of modified CPVC resin, 4-6 parts of a vinyl chloride-vinyl acetate copolymer, 1-2 parts of an acrylate copolymer, 2-3 parts of glass fiber, 1-2 parts of paraffin wax, 1-2 parts of PE wax, 1-2 parts of a methyl tin heat stabilizer and 0.2-0.3 part of hydrotalcite;

The PP pipe is made of polypropylene resin, a reinforcing filler and absolute ethyl alcohol according to a mass ratio of 10:0.6-0.8: 13-15.

2. the corrosion resistant insulated plastic power pipe of claim 1, wherein said modified CPVC resin is prepared by the process of:

(1) adding 360mL of distilled water, 60mg of sodium dodecyl benzene sulfonate and 36g of CPVC resin into a three-necked bottle in sequence, and stirring for 35min to emulsify and disperse the CPVC resin in water to form uniform dispersion liquid;

(2) weighing 14.4mg of ethyl orthosilicate and 3.6mg of gamma-aminopropyltriethoxysilane, uniformly mixing to obtain a modified liquid, and dropwise adding the modified liquid into the CPVC aqueous dispersion liquid at a constant speed through a dropping funnel, wherein the dropwise adding time is controlled to be 110-fold for 120 min;

(3) after the dripping is finished, continuously stirring for 60min, then adding hydrochloric acid with the concentration of 1mol/L, adjusting the pH value of the system to 2-3, heating to 80 ℃, reacting for 3h at the constant temperature of 80 ℃, cooling and discharging;

(4) and repeatedly washing and filtering the obtained slurry by using distilled water until the filtrate is neutral, and drying the obtained material in a vacuum drying oven at 60 ℃ until the weight is constant to obtain the modified CPVC resin.

3. The corrosion-resistant insulating plastic power tube of claim 1, wherein the reinforcing filler in the PP tube is prepared by the following method:

1) weighing graphene oxide and dopamine according to a mass ratio of 10:1, adding the graphene oxide and dopamine into a three-neck flask, and then mixing the graphene oxide and dopamine according to a solid-liquid ratio of 1 g: adding 12mL of distilled water under slow stirring to form uniform suspension, violently stirring the suspension for 12h at 80 ℃ in a nitrogen atmosphere, filtering, washing with distilled water for 4-5 times, collecting the obtained product, and drying in vacuum for 12h at 80 ℃ to obtain surface modified graphene oxide;

2) Uniformly dispersing the surface modified graphene oxide in distilled water, adding the trachelospermi nanotube, performing ultrasonic dispersion to form uniform suspension, placing the suspension in a water bath kettle at 40 ℃ for reaction for 60-70min, and finally filtering and drying the obtained mixture to obtain the reinforced filler.

4. the corrosion-resistant insulating plastic power tube as claimed in claim 3, wherein the addition amount of the trachelospermine nanotubes in step 2) is 1/12 based on the mass of the surface-modified graphene oxide.

5. a preparation process of a corrosion-resistant insulating plastic power tube is characterized by comprising the following steps:

First step, outer layer molten material: firstly, mixing and blending raw materials of the CPVC pipe according to a formula, setting the rotating speed at 200r/min, discharging a mixed material after mixing for 15min, cooling to room temperature, heating a double-roller plastic mixing machine to 212 ℃, pouring the mixed material, and carrying out melt blending for 9-10min to obtain an outer layer molten material;

Step two, inner layer melting material: ultrasonically dispersing a reinforcing filler in absolute ethyl alcohol for 60-70min, then adding polypropylene resin, continuing to perform ultrasonic treatment for 60-70min, then drying at 80 ℃ for 4-5h to remove the solvent, adding the premix into an internal mixer for melt blending, wherein the melt blending temperature is 200-205 ℃, and the time is 9-10 min;

and step three, introducing the outer layer molten material and the inner layer molten material into double-layer plastic pipe processing equipment, performing double-layer pipe co-extrusion, wherein the processing temperature range is 190-220 ℃, the rotating speed of a screw is 50r/min, and cooling, forming and cutting to obtain the plastic power pipe.

Technical Field

The invention belongs to the technical field of power tubes, and particularly relates to a corrosion-resistant insulating plastic power tube and a preparation process thereof.

Background

With the rapid development of the power industry in China, more and more plastic power pipes are adopted in the market at present, and most of the plastic power pipes are made of polyvinyl chloride materials particularly in the aspect of the laying mode of an excavation type power pipeline. Compared with a polyethylene electric power pipe, the polyvinyl chloride has better strength and impact resistance due to larger elastic modulus, and has better low-temperature brittleness resistance and compressive strength compared with a PP pipe. However, the current polyvinyl chloride pipe has relatively low strength, relatively poor toughness and poor high temperature resistance, and when the pipe is used as an electric power pipe in an environment which needs to bear high pressure and high temperature and has corrosiveness, the pipe often has a short service life due to performance reasons.

the Chinese patent with the patent number of CN201110082741.5 discloses a polyvinyl chloride pipe which comprises the following components: 35-45% of PVC resin, 1-5% of composite stabilizer, 0.1-0.5% of stearic acid, 72-5% of acrylate rubber, 0.5-1% of titanium dioxide, 0.1-1% of paraffin, 10-20% of whitening agent and 35-45% of light calcium carbonate, wherein the yield of the polyvinyl chloride pipe can be improved by 10% by replacing chlorinated polyethylene with acrylate rubber-7 (ACM-7). However, the polyvinyl chloride pipe has low strength, poor toughness, poor high temperature resistance and poor corrosion resistance, and cannot meet the construction requirements of electric power pipes.

disclosure of Invention

The invention aims to provide a corrosion-resistant insulating plastic electric power pipe and a preparation process thereof, wherein the plastic electric power pipe is a double-layer pipe, the outer layer is a CPVC (chlorinated polyvinyl chloride) pipe, the CPVC resin has good heat insulation, heat resistance and corrosion resistance, the CPVC resin is simultaneously modified by organosilane and tetraethoxysilane, the heat resistance and corrosion resistance of the CPVC resin are further improved, and meanwhile, the chlorine-vinegar copolymer and the glass fiber respectively play roles in enhancing the shock resistance and the pressure resistance, so that the obtained CPVC pipe at the outer layer has excellent corrosion resistance, heat resistance and pressure resistance; the inner layer is a PP pipe, the reinforcing filler plays a role in reinforcing and toughening, and the inner layer pipe material and the outer layer pipe material are molded in an integrated extrusion mode, so that the molding stability and the stronger peeling resistance of the power pipe can be ensured, and the advantages of the CPVC pipe and the PP pipe can be combined to ensure that the power pipe has stronger comprehensive performance; furthermore, all the raw materials of the invention are insulation raw materials, so that the obtained plastic power tube is insulated and meets the use condition of insulation.

the purpose of the invention can be realized by the following technical scheme:

A corrosion-resistant insulating plastic electric power pipe is a double-layer pipe and comprises a CPVC pipe at the outer layer and a PP pipe at the inner layer;

the CPVC pipe is prepared from the following raw materials in parts by weight: 90-100 parts of modified CPVC resin, 4-6 parts of a vinyl chloride-vinyl acetate copolymer, 1-2 parts of an acrylate copolymer, 2-3 parts of glass fiber, 1-2 parts of paraffin wax, 1-2 parts of PE wax, 1-2 parts of a methyl tin heat stabilizer and 0.2-0.3 part of hydrotalcite;

the PP pipe is made of polypropylene resin, a reinforcing filler and absolute ethyl alcohol according to a mass ratio of 10:0.6-0.8: 13-15.

Further, the modified CPVC resin is prepared by the following process:

(1) Adding 360mL of distilled water, 60mg of sodium dodecyl benzene sulfonate and 36g of CPVC resin into a three-necked bottle in sequence, and stirring for 35min to emulsify and disperse the CPVC resin in water to form uniform dispersion liquid;

(2) Weighing 14.4mg of ethyl orthosilicate and 3.6mg of gamma-aminopropyltriethoxysilane, uniformly mixing to obtain a modified liquid, and dropwise adding the modified liquid into the CPVC aqueous dispersion liquid at a constant speed through a dropping funnel, wherein the dropwise adding time is controlled to be 110-fold for 120 min;

(3) After the dripping is finished, continuously stirring for 60min, then adding hydrochloric acid with the concentration of 1mol/L, adjusting the pH value of the system to 2-3, heating to 80 ℃, reacting for 3h at the constant temperature of 80 ℃, cooling and discharging;

(4) and repeatedly washing and filtering the obtained slurry by using distilled water until the filtrate is neutral, and drying the obtained material in a vacuum drying oven at 60 ℃ until the weight is constant to obtain the modified CPVC resin.

Further, the reinforcing filler in the PP tube is prepared by the following method:

1) weighing graphene oxide and dopamine according to a mass ratio of 10:1, adding the graphene oxide and dopamine into a three-neck flask, and then mixing the graphene oxide and dopamine according to a solid-liquid ratio of 1 g: adding 12mL of distilled water under slow stirring to form uniform suspension, violently stirring the suspension for 12h at 80 ℃ in a nitrogen atmosphere, filtering, washing with distilled water for 4-5 times, collecting the obtained product, and drying in vacuum for 12h at 80 ℃ to obtain surface modified graphene oxide;

2) uniformly dispersing the surface modified graphene oxide in distilled water, adding the trachelospermi nanotube, performing ultrasonic dispersion to form uniform suspension, placing the suspension in a water bath kettle at 40 ℃ for reaction for 60-70min, and finally filtering and drying the obtained mixture to obtain the reinforced filler.

further, the addition amount of the trachelospermi nanotubes in the step 2) is 1/12 of the mass of the surface modified graphene oxide.

a preparation process of a corrosion-resistant insulating plastic power tube comprises the following steps:

first step, outer layer molten material: firstly, mixing and blending raw materials of the CPVC pipe according to a formula, setting the rotating speed at 200r/min, discharging a mixed material after mixing for 15min, cooling to room temperature, heating a double-roller plastic mixing machine to 212 ℃, pouring the mixed material, and carrying out melt blending for 9-10min to obtain an outer layer molten material;

step two, inner layer melting material: ultrasonically dispersing a reinforcing filler in absolute ethyl alcohol for 60-70min, then adding polypropylene resin, continuing to perform ultrasonic treatment for 60-70min, then drying at 80 ℃ for 4-5h to remove the solvent, adding the premix into an internal mixer for melt blending, wherein the melt blending temperature is 200-205 ℃, and the time is 9-10 min;

And step three, introducing the outer layer molten material and the inner layer molten material into double-layer plastic pipe processing equipment, performing double-layer pipe co-extrusion, wherein the processing temperature range is 190-220 ℃, the rotating speed of a screw is 50r/min, and cooling, forming and cutting to obtain the plastic power pipe.

The invention has the beneficial effects that:

The plastic power pipe is a double-layer pipe, the outer layer is a CPVC pipe, the CPVC resin is modified by adopting organosilane and tetraethoxysilane, the organosilane has certain solubility on the CPVC resin in the modification process, the surfaces of CPVC particles can be corroded by the organosilane, and the corroded CPVC particles are easier to hydrolyze with tetraethoxysilane to obtain SiO₂Hybridization is carried out, and after hybridization modification, a Si-O-Si network structure is formed on the surfaces of CPVC resin particles, so that on one hand, the Si-O-Si network structure has certain limitation on the movement of CPVC macromolecular chains and has certain inhibition effect on the degradation of CPVC macromolecules, thereby effectively improving the thermal stability of the CPVC resin; on the other hand, the Si-O-Si network structure can effectively protect resin molecule particles and improve the corrosion resistance of the CPVC; meanwhile, the vinyl acetate in the vinyl chloride-vinyl acetate copolymer can damage the close chain accumulation of the CPVC resin, so that the flexibility and the fluidity of a blending system are increased, and the processability and the impact resistance are improved; the compressive strength of the CPVC pipe can be obviously improved by doping the glass fiber;

the inner layer pipe is a PP pipe, the PP resin is modified by adopting the reinforcing filler, the surface of graphene oxide is modified by adopting dopamine, and-NH of the dopamine₂reacting with-OH on the surface of graphene oxide to graft dopamine on the surface of the graphene oxide to obtain surface modified graphene oxide; the tourmalinite nanotube is deposited on the surface of the graphene oxide through electrostatic interaction, and moreover, the phenolic hydroxyl on the surface modified graphene oxide is connected with the Si-O bond in the tourmalinite nanotubeForming a hydrogen bond, and forming a coordination bond between catechol in the surface-modified graphene oxide and an Al-O bond in the trachelospermite nanotube, so that the surface-modified graphene oxide and the trachelospermite nanotube have stronger interaction; the interaction has positive effects on inhibiting aggregation of the filler and promoting dispersion, on one hand, stacking of the graphene oxide disappears, and the remaining stacking height is disordered, on the other hand, a large number of-OH groups on the trachelospermi nanotubes and polar groups of the graphene oxide sheets show strong interaction, so that the interaction between the polar groups of the graphene oxide sheets is weakened, stripping and dispersion of the graphene oxide sheets are promoted by adding the trachelospermi nanotubes, and the trachelospermi nanotubes are successfully inserted into the graphene oxide sheet layers; the reinforcing filler uniformly dispersed in the PP matrix has a nail anchor effect or a physical cross-linking point effect with macromolecules of the PP matrix, so that the stress transfer and dispersion in the composite material in the stretching and impact processes are promoted, and the reinforcing filler has an obvious synergistic reinforcing and toughening effect on the PP; meanwhile, the lamellar reinforcing filler is uniformly distributed in the PP matrix, so that a good physical heat insulation layer can be formed, heat flow transfer is effectively blocked, and the thermal stability of the PP pipe is improved;

The plastic electric power pipe is a double-layer pipe, the outer layer is a CPVC pipe, the CPVC resin has good heat insulation, heat resistance and corrosion resistance, the heat resistance and the corrosion resistance of the CPVC resin are further improved by simultaneously modifying the CPVC resin through organosilane and tetraethoxysilane, and meanwhile, the chlorine-vinegar copolymer and the glass fiber respectively play roles in enhancing the shock resistance and the pressure resistance, so that the obtained CPVC pipe at the outer layer has excellent corrosion resistance, heat resistance and pressure resistance; the inner layer is a PP pipe, the reinforcing filler plays a role in reinforcing and toughening, and the inner layer pipe material and the outer layer pipe material are molded in an integrated extrusion mode, so that the molding stability and the stronger peeling resistance of the power pipe can be ensured, and the advantages of the CPVC pipe and the PP pipe can be combined to ensure that the power pipe has stronger comprehensive performance; furthermore, all the raw materials of the invention are insulation raw materials, so that the obtained plastic power tube is insulated and meets the use condition of insulation.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A corrosion-resistant insulating plastic electric power pipe is a double-layer pipe and comprises a CPVC pipe at the outer layer and a PP pipe at the inner layer;

the CPVC pipe is prepared from the following raw materials in parts by weight: 90-100 parts of modified CPVC resin (chlorinated polyvinyl chloride resin), 4-6 parts of vinyl chloride-vinyl acetate copolymer, 1-2 parts of acrylate copolymer, 2-3 parts of glass fiber, 1-2 parts of paraffin, 1-2 parts of PE wax, 1-2 parts of methyl tin heat stabilizer and 0.2-0.3 part of hydrotalcite (auxiliary stabilizer);

vinyl acetate in the vinyl chloride-vinyl acetate copolymer can destroy close chain packing of the CPVC resin, so that the flexibility and the flowability of a blending system are increased, and the processability and the impact resistance are improved; the compressive strength of the CPVC pipe can be obviously improved by doping the glass fiber;

the modified CPVC resin is prepared by the following method:

(1) adding 360mL of distilled water, 60mg of sodium dodecyl benzene sulfonate and 36g of CPVC resin into a three-necked bottle in sequence, and stirring for 35min to emulsify and disperse the CPVC resin in water to form uniform dispersion liquid;

(2) weighing 14.4mg of ethyl orthosilicate and 3.6mg of gamma-aminopropyltriethoxysilane, uniformly mixing to obtain a modified liquid, and dropwise adding the modified liquid into the CPVC aqueous dispersion liquid at a constant speed through a dropping funnel, wherein the dropwise adding time is controlled to be 110-fold for 120 min;

(3) after the dripping is finished, continuously stirring for 60min, then adding hydrochloric acid with the concentration of 1mol/L, adjusting the pH value of the system to 2-3, heating to 80 ℃, reacting for 3h at the constant temperature of 80 ℃, cooling and discharging;

(4) Repeatedly washing and filtering the obtained slurry with distilled water until the filtrate is neutral, and drying the obtained material in a vacuum drying oven at 60 ℃ until the weight is constant to obtain the modified CPVC resin;

the CPVC resin is modified by adopting organosilane and tetraethoxysilane simultaneously, in the modification process, the organosilane has certain solubility on the CPVC resin, the surfaces of CPVC particles can be corroded by the organosilane, and the corroded CPVC particles are easier to hydrolyze with tetraethoxysilane to obtain SiO₂Hybridization is carried out, and after hybridization modification, a Si-O-Si network structure is formed on the surfaces of CPVC resin particles, so that on one hand, the Si-O-Si network structure has certain limitation on the movement of CPVC macromolecular chains and has certain inhibition effect on the degradation of CPVC macromolecules, thereby effectively improving the thermal stability of the CPVC resin; on the other hand, the Si-O-Si network structure can effectively protect resin molecule particles and improve the corrosion resistance of the CPVC;

The PP pipe is made of polypropylene resin (PP), a reinforcing filler and absolute ethyl alcohol according to the mass ratio of 10:0.6-0.8: 13-15;

The reinforcing filler is prepared by the following method:

1) Weighing graphene oxide and dopamine according to a mass ratio of 10:1, adding the graphene oxide and dopamine into a three-neck flask, and then mixing the graphene oxide and dopamine according to a solid-liquid ratio of 1 g: adding 12mL of distilled water under slow stirring to form uniform suspension, violently stirring the suspension for 12h at 80 ℃ in a nitrogen atmosphere, filtering, washing with distilled water for 4-5 times, collecting the obtained product, and drying in vacuum for 12h at 80 ℃ to obtain surface modified graphene oxide;

2) uniformly dispersing the surface modified graphene oxide in distilled water, adding an trachelospermi nanotube, performing ultrasonic dispersion to form uniform suspension, placing the suspension in a water bath kettle at 40 ℃ for reaction for 60-70min, and finally filtering and drying the obtained mixture to obtain a reinforced filler;

wherein the addition amount of the trachelospermi nanotubes is 1/12 of the mass of the surface modified graphene oxide;

Firstly, dopamine is adopted to carry out surface modification on graphene oxide, namely-NH of dopamine₂reacting with-OH on the surface of graphene oxide to graft dopamine on the surface of the graphene oxide to obtain surface modified graphene oxide; depositing the trachelospermine nanotube on the surface of the graphene oxide through electrostatic interaction, and modifying the phenolic hydroxyl on the graphene oxide and the trachelospermine nanotube on the surfacehydrogen bonds are formed between Si-O bonds in the trachelospermin nanotubes, and coordination bonds are formed between catechol in the surface modified graphene oxide and Al-O bonds in the trachelospermin nanotubes, so that stronger interaction exists between the surface modified graphene oxide and the trachelospermin nanotubes; the interaction has positive effects on inhibiting aggregation of the filler and promoting dispersion, on one hand, stacking of the graphene oxide disappears, and the remaining stacking height is disordered, on the other hand, a large number of-OH groups on the trachelospermi nanotubes and polar groups of the graphene oxide sheets show strong interaction, so that the interaction between the polar groups of the graphene oxide sheets is weakened, stripping and dispersion of the graphene oxide sheets are promoted by adding the trachelospermi nanotubes, and the trachelospermi nanotubes are successfully inserted into the graphene oxide sheet layers; the reinforcing filler uniformly dispersed in the PP matrix has a nail anchor effect or a physical cross-linking point effect with macromolecules of the PP matrix, so that the stress transfer and dispersion in the composite material in the stretching and impact processes are promoted, and the reinforcing filler has an obvious synergistic reinforcing and toughening effect on the PP; meanwhile, the lamellar reinforcing filler is uniformly distributed in the PP matrix, so that a good physical heat insulation layer can be formed, heat flow transfer is effectively blocked, and the thermal stability of the PP pipe is improved;

the preparation process of the plastic power tube comprises the following steps:

First step, outer layer molten material: firstly, mixing and blending raw materials of the CPVC pipe according to a formula, setting the rotating speed at 200r/min, discharging a mixed material after mixing for 15min, cooling to room temperature, heating a double-roller plastic mixing machine to 212 ℃, pouring the mixed material, and carrying out melt blending for 9-10min to obtain an outer layer molten material;

step two, inner layer melting material: ultrasonically dispersing a reinforcing filler in absolute ethyl alcohol for 60-70min, adding polypropylene resin, continuously carrying out ultrasonic treatment for 60-70min, drying at 80 ℃ for 4-5h to remove the solvent, so that PP particles completely and uniformly cover the reinforcing filler, adding the premix into an internal mixer for melt blending, wherein the melt blending temperature is 200-; the dispersibility of the reinforcing filler in the PP matrix can be further improved by dispersing the reinforcing filler and the PP resin in the absolute ethyl alcohol in advance;

step three, introducing the outer layer molten material and the inner layer molten material into double-layer plastic pipe processing equipment, performing double-layer pipe co-extrusion, wherein the processing temperature range is 190-220 ℃, the rotating speed of a screw is 50r/min, and cooling, forming and cutting to obtain the plastic power pipe;

the double-layer pipe is integrally formed, so that the forming stability and the strong peeling resistance of the power pipe can be guaranteed, and the advantages of the CPVC pipe and the PP pipe can be combined, so that the power pipe has strong comprehensive performance.