CN110760034A - Preparation process of steel strip reinforced spiral corrugated pipe - Google Patents
Preparation process of steel strip reinforced spiral corrugated pipe Download PDFInfo
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- CN110760034A CN110760034A CN201910950259.5A CN201910950259A CN110760034A CN 110760034 A CN110760034 A CN 110760034A CN 201910950259 A CN201910950259 A CN 201910950259A CN 110760034 A CN110760034 A CN 110760034A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
- B29C48/152—Coating hollow articles the inner surfaces thereof
- B29C48/153—Coating both inner and outer surfaces
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/14—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom
- C07D251/16—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom to only one ring carbon atom
- C07D251/18—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom to only one ring carbon atom with nitrogen atoms directly attached to the two other ring carbon atoms, e.g. guanamines
Abstract
The invention discloses a preparation process of a steel strip reinforced spiral corrugated pipe, which comprises the following specific preparation processes of: adding the conductive antioxidant polymer into an extruder for melt extrusion, spirally inputting a steel strip from one side, and wrapping the steel strip by the extruded polyethylene from the inner side and the outer side of the spiral corrugated pipe respectively to obtain the steel strip reinforced spiral corrugated pipe. According to the invention, both ends of the unsaturated antioxidant and diallyl benzoate added in the preparation process of the corrugated pipe contain olefin groups, and can be subjected to polymerization reaction with two adjacent high-density polyethylenes, the two adjacent high-density polyethylenes are crosslinked together through the unsaturated antioxidant and the diallyl benzoate, a net structure is formed after a plurality of high-density polyethylenes are crosslinked, and a large amount of the unsaturated antioxidant and the diallyl benzoate are uniformly dispersed on the connection points of the net structure, so that the antistatic property and the aging resistance are uniform, and the antistatic property and the antioxidant property of the corrugated pipe are further effectively improved.
Description
Technical Field
The invention belongs to the field of corrugated pipe preparation, and relates to a preparation process of a steel strip reinforced spiral corrugated pipe.
Background
The high-density polyethylene has the advantages of acid and alkali resistance, organic solvent resistance, excellent electrical insulation, certain toughness at low temperature, high surface hardness, high tensile strength and the like, and is widely applied to the preparation of pipelines.
Disclosure of Invention
The invention aims to provide a preparation process of a steel strip reinforced spiral corrugated pipe, wherein both ends of unsaturated antioxidant and diallyl benzoate added in the preparation process of the corrugated pipe contain olefin groups, and the olefin groups and the two adjacent high-density polyethylene can be subjected to polymerization reaction, two adjacent high-density polyethylenes are crosslinked together through an unsaturated antioxidant and diallyl phthalate, and after a plurality of high-density polyethylenes are crosslinked, forming a net structure, uniformly dispersing a large amount of unsaturated antioxidant and diallyl phthalate on the connection points of the net structure, the aging resistance of the high-density polyethylene can be realized through the action of the unsaturated antioxidant, and the antistatic action of the polyethylene can be realized through the introduction of the diallyl benzoate, and the antistatic performance and the aging resistance are uniform, so that the antistatic performance and the antioxidant performance of the corrugated pipe are effectively improved.
The purpose of the invention can be realized by the following technical scheme:
a preparation process of a steel strip reinforced spiral corrugated pipe comprises the following specific preparation processes:
step one, adding 1,2, 4-trimellitic anhydride and acetone into a reaction kettle at the same time, stirring and dissolving, then adding allyl alcohol into the reaction kettle, heating to 250-260 ℃, carrying out reflux reaction for 18-20h, and then carrying out reduced pressure distillation to obtain diallyl benzoate; wherein the mass ratio of 1,2, 4-trimellitic anhydride to allyl alcohol is 1: 2.1-2.2; the acid anhydride group in the 1,2, 4-trimellitic anhydride can perform esterification ring-opening reaction with hydroxyl in allyl alcohol at high temperature, two carboxyl groups after ring opening can both react with the allyl alcohol, and then two allyl groups are introduced at two sides of a benzene ring of the 1,2, 4-benzenetricarboxylic anhydride, and simultaneously, as the benzene ring is very much in the 1,2, 4-trimellitic anhydride and is connected with the carboxyl on the benzene ring, the benzene ring can realize electronic conduction, and the carboxyl contained in the benzene ring can realize ionic conduction, so that the accumulation of electrostatic charge is reduced, and the antistatic effect is realized;
secondly, adding unsaturated antioxidant and diallyl benzoate into dimethylbenzene, stirring and dissolving to prepare an unsaturated antioxidant solution with the mass concentration of 30% and a diallyl benzoate solution with the mass concentration of 25%, then simultaneously adding high-density polyethylene and dimethylbenzene into a reaction kettle, heating to 80-90 ℃, stirring and dissolving, stirring and mixing uniformly, then adding azobisisobutyronitrile, keeping the temperature unchanged, carrying out reflux reaction for 30-40min, then dropwise adding the unsaturated antioxidant solution and the diallyl benzoate solution into the reaction kettle, controlling the dropwise adding speed to be 8-9mL/min, heating to 120-125 ℃ after complete dropwise addition, carrying out reflux reaction for 5-6h, and then evaporating to remove the solvent therein, thus obtaining the conductive antioxidant polymer; adding 0.68-0.72g of azobisisobutyronitrile, 0.21-0.24g of unsaturated antioxidant and 0.16-0.17g of diallyl benzoate into per gram of high-density polyethylene; both ends of the unsaturated antioxidant and the diallyl benzoate contain olefin groups and can carry out polymerization reaction with two adjacent high-density polyethylenes, the two adjacent high-density polyethylenes are crosslinked together through the unsaturated antioxidant and the diallyl benzoate, a plurality of high-density polyethylenes form a net structure after crosslinking, a large amount of unsaturated antioxidant and the diallyl benzoate are uniformly dispersed on the connection points of the net structure, the ageing resistance of the high-density polyethylene can be realized through the action of the unsaturated antioxidant, meanwhile, the antistatic action of the polyethylene can be realized through the introduction of the diallyl benzoate, and the antistatic property and the ageing resistance are uniform;
and thirdly, adding the conductive antioxidant polymer prepared in the second step into an extruder for melt extrusion, spirally inputting a steel belt from one side, and wrapping the steel belt by the extruded polyethylene from the inner side and the outer side of the spiral corrugated pipe respectively to obtain the steel belt reinforced spiral corrugated pipe.
The unsaturated antioxidant is prepared by the following specific steps:
①, adding acrylamide into ether, stirring for dissolving, then adding salicylaldehyde into the ether, heating to 60-65 ℃, stirring for reacting for 5-6h, then cooling to room temperature, filtering, washing and drying to obtain a product A, wherein the reaction structural formula is as follows, the acrylamide and the salicylaldehyde are added according to the mass ratio of 1: 1, aldehyde groups in the salicylaldehyde can react with amino groups in the acrylamide to generate-C-N-bonds, and then olefin groups and phenolic hydroxyl groups are introduced into the product A;
② concentrated hydrochloric acid, paraformaldehyde and dioxane are added into a reaction kettle at the same time, then product A is added into the reaction kettle, stirring and mixing are carried out for 3-5min, then 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine is added into the reaction kettle in portions, the adding amount of each time is kept at 150mg, the adding interval time is 10-12min, after the complete addition, the temperature is controlled to be unchanged, stirring and reacting are carried out for 40-45h, then the temperature is heated to 50-60 ℃, refluxing and reacting are carried out for 8-10h, then solvent is evaporated, the evaporated product is washed to be neutral by sodium hydroxide solution with the concentration of 5% and deionization sequentially, acetone is used for washing for 3-5 times, then drying is carried out to obtain product B, the reaction structural formula is shown in the specification, wherein 1.2-1.3mL of concentrated hydrochloric acid is added into each gram of product A, 0.8-0.9g of paraformaldehyde is added, 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine is added into each gram of product A, and then two sides of product containing amino groups are methylated, 2-6-amino groups are introduced into the product A, and the product A, 2-6-amino-5-amino-6-triazine under the condition that the two sides of the product is capable of the amino group is introduced into the amino group containing the amino group under the amino group methylation reaction, the amino group under the condition that is introduced into the amino group of the amino group;
③ adding the product B and anhydrous aluminum chloride into a reaction kettle, adding o-dichlorobenzene, stirring at normal temperature for 30-40min, adding resorcinol, heating to 90-95 ℃, stirring for reaction for 3-4h, reducing to room temperature, adding ice water, extracting, and distilling under reduced pressure the obtained organic layer to obtain unsaturated antioxidant, wherein the reaction structural formula is as follows, 0.21-0.22g of resorcinol is added into per gram of the product B, 8-9mL of o-dichlorobenzene is added, and 0.48-0.49g of anhydrous aluminum chloride is added, wherein after resorcinol is introduced, the o-phenolic hydroxyl groups and nitrogen atoms on the adjacent triazine ring form intramolecular hydrogen bonds, thereby forming a six-membered ring, when ultraviolet light irradiates in the polymer, the hydrogen bonds in the formed six-membered ring are broken due to thermal vibration, the chelate ring is opened, an ionic compound in a high-energy unstable state is formed, wherein the ionic compound is recovered to a stable ground state, excess energy is closed by heat energy or radiation energy, thereby releasing a chelate ring, and further, the polymer can absorb a small amount of free radicals to inhibit the ultraviolet light, thereby realizing the synergistic effect of the absorption of the antioxidant, and further realizing the degradation of the polymer, and the three free radicals, and further realizing the synergistic effect of the anti-aging inhibition of the absorption of the residual hydroxyl groups in the ultraviolet light absorption process, and the anti-aging of the polymer, and the anti-aging of the polymer;
the invention has the beneficial effects that:
1. according to the invention, both ends of the unsaturated antioxidant and diallyl benzoate added in the preparation process of the corrugated pipe contain olefin groups, and can be subjected to polymerization reaction with two adjacent high-density polyethylenes, the two adjacent high-density polyethylenes are crosslinked together through the unsaturated antioxidant and the diallyl benzoate, a net structure is formed after a plurality of high-density polyethylenes are crosslinked, a large amount of the unsaturated antioxidant and the diallyl benzoate are uniformly dispersed on the connection points of the net structure, the aging resistance of the high-density polyethylene can be realized through the action of the unsaturated antioxidant, meanwhile, the antistatic action of the polyethylene can be realized through the introduction of the diallyl benzoate, the antistatic property and the aging resistance are uniform, and further, the antistatic property and the antioxidant property of the corrugated pipe are effectively improved.
2. After resorcinol is introduced into the unsaturated antioxidant prepared by the invention, the ortho phenolic hydroxyl group and nitrogen atoms on adjacent triazine rings form intramolecular hydrogen bonds, so that a six-membered ring is formed, when ultraviolet rays are irradiated in a polymer, under the action of ultraviolet light, the hydrogen bonds in the formed six-membered ring are broken due to thermal vibration, chelate rings are opened, and an ionic compound in a high-energy unstable state is formed, wherein in the process that the ionic compound is recovered to a stable ground state, redundant energy is released through heat energy or radiant energy, the chelate rings are closed again, so that a reversible process is formed, in the reversible process, the six-membered ring is opened by absorbing the ultraviolet rays, so that the absorption effect of the ultraviolet rays is realized, the aging effect of the ultraviolet rays on the polymer can be effectively prevented, and meanwhile, the antioxidant contains phenolic hydroxyl groups in three different directions, hydrogen in phenolic hydroxyl can fall off and react with free radicals to make the free radicals lose activity, and then inhibit the free radical reaction, through the absorption of six-membered ring to ultraviolet ray, the production of free radicals is reduced, simultaneously, a small amount of free radicals produced in the surplus pass through the inhibiting effect of other several phenolic hydroxyl groups, realize the synergistic effect of the two, and then improve the antioxidant property of polymer, effectively solved steel band reinforcing helical bellows and used in the aspects such as external drainage pipeline or oil pipeline usually, therefore often stand the irradiation of light, the problem that the existing antioxidant can not satisfy the high-performance anti-aging requirement.
Detailed Description
The technical solutions will be described clearly and completely in the following with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1:
the unsaturated antioxidant is prepared by the following specific steps:
①, adding 7.1g of acrylamide into 200mL of diethyl ether, stirring and dissolving, then adding 12.2g of salicylaldehyde into the solution, heating to 60-65 ℃, stirring and reacting for 5-6h, then cooling to room temperature, filtering, washing and drying to obtain a product A, wherein the reaction structural formula is shown as follows;
② adding 12mL of concentrated hydrochloric acid, 8g of paraformaldehyde and 150mL of dioxane into a reaction kettle at the same time, then adding 10g of the product A into the reaction kettle, stirring and mixing for 3-5min, then adding 4.7g of 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine into the reaction kettle in several times, keeping the adding amount of each time to be 100-150mg, the adding interval time of each time to be 10-12min, controlling the temperature to be unchanged after completely adding, stirring and reacting for 40-45h, then heating to 50-60 ℃, refluxing and reacting for 8-10h, then evaporating to remove the solvent in the reaction product, washing the evaporated product to be neutral by using a 5% sodium hydroxide solution and deionization in sequence, then washing for 3-5 times by using acetone, and then drying to obtain a product B;
③, adding 10g of the product B and 4.8g of anhydrous aluminum chloride into a reaction kettle, adding 80mL of o-dichlorobenzene, stirring and reacting at normal temperature for 30-40min, then adding 2.1g of resorcinol, heating to 90-95 ℃, stirring and reacting for 3-4h, cooling to room temperature, adding ice water, extracting, and distilling the obtained organic layer under reduced pressure to obtain an unsaturated antioxidant, wherein the reaction structural formula is as follows;
example 2:
the unsaturated antioxidant is prepared by the following specific steps:
①, adding 7.1g of acrylamide into 200mL of diethyl ether, stirring and dissolving, then adding 12.2g of salicylaldehyde into the solution, heating to 60-65 ℃, stirring and reacting for 5-6h, then cooling to room temperature, and filtering, washing and drying to obtain a product A;
② adding 12mL of concentrated hydrochloric acid, 8g of paraformaldehyde and 150mL of dioxane into a reaction kettle at the same time, then adding 4.8g of the product A into the reaction kettle, stirring and mixing for 3-5min, then adding 4.7g of 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine into the reaction kettle in several times, keeping the adding amount of each time to be 100-150mg, the interval time of each time to be 10-12min, controlling the temperature to be unchanged after completely adding, stirring and reacting for 40-45h, then heating to 50-60 ℃, refluxing and reacting for 8-10h, then evaporating to remove the solvent, then washing the evaporated product to neutrality by using a 5% sodium hydroxide solution and deionization in sequence, then washing for 3-5 times by using acetone, and then drying to obtain a product B;
③ adding 10g of the product B and 4.8g of anhydrous aluminum chloride into a reaction kettle, simultaneously adding 80mL of o-dichlorobenzene, stirring and reacting at normal temperature for 30-40min, then adding 2.1g of resorcinol, heating to 90-95 ℃, stirring and reacting for 3-4h, adding ice water after cooling to room temperature, then extracting, and distilling the obtained organic layer under reduced pressure to obtain the unsaturated antioxidant.
Example 3:
the unsaturated antioxidant is prepared by the following specific steps:
①, adding 7.1g of acrylamide into 200mL of diethyl ether, stirring and dissolving, then adding 12.2g of salicylaldehyde into the solution, heating to 60-65 ℃, stirring and reacting for 5-6h, then cooling to room temperature, and filtering, washing and drying to obtain a product A;
② adding 12mL of concentrated hydrochloric acid, 8g of paraformaldehyde and 150mL of dioxane into a reaction kettle at the same time, then adding 10g of the product A into the reaction kettle, stirring and mixing for 3-5min, then adding 4.7g of 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine into the reaction kettle in several times, keeping the adding amount of each time at 100-150mg, the adding interval time of each time at 10-12min, controlling the temperature to be constant and stirring for reaction for 40-45h after completely adding, then heating to 50-60 ℃ for reflux reaction for 8-10h, then evaporating to remove the solvent in the reaction product, washing the evaporated product to neutrality by using a 5% sodium hydroxide solution and deionization in sequence, washing by using acetone for 3-5 times, and then drying to obtain the product B, namely the unsaturated antioxidant.
Example 4:
a preparation process of a steel strip reinforced spiral corrugated pipe comprises the following specific preparation processes:
firstly, adding 19.2g of 1,2, 4-trimellitic anhydride and 300mL of acetone into a reaction kettle at the same time, stirring and dissolving, then adding 12.2g of allyl alcohol into the reaction kettle, heating to 250-260 ℃, carrying out reflux reaction for 18-20h, and then carrying out reduced pressure distillation to obtain diallyl benzoate;
secondly, adding the unsaturated antioxidant and the diallyl phthalate prepared in the example 1 into dimethylbenzene, stirring and dissolving to prepare an unsaturated antioxidant solution with the mass concentration of 30% and a diallyl phthalate solution with the mass concentration of 25%, then adding 10g of high-density polyethylene and 100mL of dimethylbenzene into the reaction kettle at the same time, heating to 80-90 ℃, stirring for dissolving, stirring and mixing uniformly, then 6.8g of azobisisobutyronitrile is added, the temperature is kept unchanged, the reaction is carried out for reflux reaction for 30-40min, then, 7g of unsaturated antioxidant solution and 6.4g of diallyl benzoate solution are added dropwise, the dropping speed is controlled to be 8-9mL/min, the temperature is raised to 120-125 ℃ after complete dropping for reflux reaction for 5-6h, and then the solvent is removed by evaporation to obtain the conductive antioxidant polymer;
and thirdly, adding the conductive antioxidant polymer prepared in the second step into an extruder for melt extrusion, spirally inputting a steel belt from one side, and wrapping the steel belt by the extruded polyethylene from the inner side and the outer side of the spiral corrugated pipe respectively to obtain the steel belt reinforced spiral corrugated pipe.
Example 5:
a process for preparing a steel strip reinforced helical bellows, which comprises the same steps as in example 4, wherein the unsaturated antioxidant prepared in example 1 and used in the second step of example 4 is replaced with the unsaturated antioxidant prepared in example 2.
Example 6:
a process for preparing a steel strip reinforced helical bellows, which comprises the same steps as in example 4, wherein the unsaturated antioxidant prepared in example 1 and used in the second step of example 4 is replaced with the unsaturated antioxidant prepared in example 3.
Example 7:
melting the conductive antioxidant polymers prepared in the embodiments 4 to 6, adding the melted conductive antioxidant polymers into a mold to prepare a sample piece, and then placing the sample piece into a xenon lamp aging test box to carry out ultraviolet aging treatment for different times, wherein the ultraviolet illumination intensity is 40mW/cm2The temperature is 50 ℃, the air humidity is 50%, then the tensile strength of the sample piece before aging is tested, and the measurement results are shown in table 1;
TABLE 1 tensile Strength (MPa) before and after aging of test pieces prepared in examples 4-6
As shown in Table 1, the conductive antioxidant polymer prepared in example 4 has high aging resistance, the strength of the conductive antioxidant polymer is not changed greatly after the conductive antioxidant polymer is aged for 40 days by irradiation in a xenon lamp aging test box, because both ends of the unsaturated antioxidant and diallyl benzoate contain olefin groups, the conductive antioxidant polymer and diallyl benzoate can be subjected to polymerization reaction with two adjacent high-density polyethylenes, two adjacent high-density polyethylenes are crosslinked together through the unsaturated antioxidant and the diallyl benzoate, a plurality of high-density polyethylenes form a net structure after crosslinking, a large number of unsaturated antioxidants are uniformly dispersed on the connecting points of the net structure, the aging resistance of the high-density polyethylenes can be realized through the action of the unsaturated antioxidants, the aging resistance is uniform, and simultaneously, after resorcinol is introduced, the ortho-phenolic hydroxyl groups and nitrogen atoms on adjacent triazine rings form intramolecular hydrogen bonds, and then form a six-membered ring, when ultraviolet is irradiated in the polymer, due to the action of ultraviolet light, the hydrogen bond in the six-membered ring is broken due to thermal vibration, the chelate ring is opened, and the ionic compound in a high-energy unstable state is formed, wherein in the process that the ionic compound is recovered to a stable ground state, redundant energy is released through heat energy or radiation energy, the chelate ring is closed again, and then a reversible process is formed, in the reversible process, the six-membered ring is opened through absorbing ultraviolet rays, and then the absorption effect on the ultraviolet rays is realized, the aging effect of the ultraviolet rays on the polymer can be effectively prevented, meanwhile, the antioxidant additionally contains phenolic hydroxyl groups in three different directions, hydrogen in the phenolic hydroxyl groups can be fallen off and reacts with free radicals to make the free radicals inactive, and then the free radical reaction is inhibited, and the ultraviolet rays are absorbed by the six-membered ring, the generation of free radicals is reduced, meanwhile, a small amount of generated free radicals realize the synergistic effect of the free radicals and other phenolic hydroxyl groups through the inhibition effect of other phenolic hydroxyl groups, and further the antioxidant performance of the polymer is improved, in the antioxidant used in example 5, only one product A is introduced into 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine, so that the phenolic hydroxyl group content in the prepared polymer is reduced, and the antioxidant performance of the polymer is reduced, while in example 6, no phenolic hydroxyl group is introduced into the ortho-position of the triazine ring, so that a six-membered ring structure cannot be formed, the ultraviolet absorption cannot be realized, only the phenolic hydroxyl group acts on the free radicals, and further the antioxidant performance of the polymer is greatly reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments 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 utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A preparation process of a steel strip reinforced spiral corrugated pipe is characterized by comprising the following specific preparation processes:
step one, adding 1,2, 4-trimellitic anhydride and acetone into a reaction kettle at the same time, stirring and dissolving, then adding allyl alcohol into the reaction kettle, heating to 250-260 ℃, carrying out reflux reaction for 18-20h, and then carrying out reduced pressure distillation to obtain diallyl benzoate;
secondly, adding unsaturated antioxidant and diallyl benzoate into dimethylbenzene, stirring and dissolving to prepare an unsaturated antioxidant solution with the mass concentration of 30% and a diallyl benzoate solution with the mass concentration of 25%, then simultaneously adding high-density polyethylene and dimethylbenzene into a reaction kettle, heating to 80-90 ℃, stirring and dissolving, stirring and mixing uniformly, then adding azobisisobutyronitrile, keeping the temperature unchanged, carrying out reflux reaction for 30-40min, then dropwise adding the unsaturated antioxidant solution and the diallyl benzoate solution into the reaction kettle, controlling the dropwise adding speed to be 8-9mL/min, heating to 120-125 ℃ after complete dropwise addition, carrying out reflux reaction for 5-6h, and then evaporating to remove the solvent therein, thus obtaining the conductive antioxidant polymer;
and thirdly, adding the conductive antioxidant polymer prepared in the second step into an extruder for melt extrusion, feeding a steel belt from one side of the extruder in a spiral mode, and wrapping the steel belt by the extruded polyethylene from the inner side and the outer side of the spiral corrugated pipe respectively to obtain the steel belt reinforced spiral corrugated pipe.
2. The process of claim 1, wherein in the second step, 0.68-0.72g of azobisisobutyronitrile, 0.21-0.24g of unsaturated antioxidant and 0.16-0.17g of diallyl benzoate are added per gram of the high density polyethylene.
3. The process for preparing a steel strip reinforced helical bellows as claimed in claim 1, wherein the unsaturated antioxidant is prepared by the following steps:
① adding acrylamide into ether, stirring to dissolve, adding salicylaldehyde, heating to 60-65 deg.C, stirring to react for 5-6h, cooling to room temperature, filtering, washing, and oven drying to obtain product A with the following reaction structural formula;
② adding concentrated hydrochloric acid, paraformaldehyde and dioxane into a reaction kettle simultaneously, adding the product A into the reaction kettle, stirring and mixing for 3-5min, adding 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine into the reaction kettle in several times, keeping the addition amount of each time as 100-150mg, the addition interval time of each time as 10-12min, controlling the temperature to be constant after the complete addition, stirring and reacting for 40-45h, heating to 50-60 ℃, performing reflux reaction for 8-10h, evaporating to remove the solvent, washing the evaporated product to neutrality by using a sodium hydroxide solution with the concentration of 5% and deionization in sequence, washing by using acetone for 3-5 times, and drying to obtain a product B, wherein the reaction structural formula is as follows;
③ adding the product B and anhydrous aluminum chloride into a reaction kettle, adding o-dichlorobenzene, stirring at normal temperature for reaction for 30-40min, adding resorcinol, heating to 90-95 ℃, stirring for reaction for 3-4h, cooling to room temperature, adding ice water, extracting, and distilling the obtained organic layer under reduced pressure to obtain an unsaturated antioxidant, wherein the reaction structural formula is as follows;
4. the process of claim 3, wherein in step ②, concentrated hydrochloric acid 1.2-1.3mL, paraformaldehyde 0.8-0.9g, and 2-chloro-4, 6-bis (ethylamino) -1,3, 5-triazine 0.47-0.48g are added per gram of product A.
5. The process of claim 3, wherein in the ③ step, 0.21-0.22g of resorcinol, 8-9mL of o-dichlorobenzene, and 0.48-0.49g of anhydrous aluminum chloride are added per gram of product B.
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| CN113788930A (en) * | 2021-09-15 | 2021-12-14 | 安徽誉林新材料科技有限公司 | Production process of environment-friendly polyurethane elastomer for ground washing machine wheel |
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