CN117922103A - Preparation method of insulating stay - Google Patents
Preparation method of insulating stay Download PDFInfo
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- CN117922103A CN117922103A CN202410104583.6A CN202410104583A CN117922103A CN 117922103 A CN117922103 A CN 117922103A CN 202410104583 A CN202410104583 A CN 202410104583A CN 117922103 A CN117922103 A CN 117922103A
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- glue
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000000047 product Substances 0.000 claims description 57
- 239000011087 paperboard Substances 0.000 claims description 52
- 239000003292 glue Substances 0.000 claims description 37
- 238000003825 pressing Methods 0.000 claims description 33
- 238000004806 packaging method and process Methods 0.000 claims description 24
- 230000001680 brushing effect Effects 0.000 claims description 23
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 239000000123 paper Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 238000006068 polycondensation reaction Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 15
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 238000001035 drying Methods 0.000 description 7
- 238000007731 hot pressing Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012279 drainage procedure Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The invention belongs to the technical field of insulating product production, and discloses a preparation method of an insulating stay. The invention can effectively shorten the process time, improve the production efficiency and reduce the energy consumption of equipment when the insulating stays with different thicknesses are manufactured, and simultaneously ensures the stability of the mechanical property and the electrical property of the product and does not generate deformation phenomenon.
Description
Technical Field
The invention belongs to the technical field of insulating product production, and particularly relates to a preparation method of an insulating stay.
Background
The insulating stay is an insulating material widely applied to insulating parts of transformers, and in the transformers, the insulating stay is required to have higher voltage resistance and higher mechanical property, and is not deformed and is resistant to bending; as the size increases, the product requirements are increasing, particularly in high voltage class transformers. When the product is manufactured, the traditional process method is that the materials are proportioned and cut according to the thickness of the required stay, then the materials are put into a hot air circulation drying box for drying, the dried materials need to be cooled and then are glued, then the glued paper board is put into a hot press for hot pressing, and after hot pressing, the product is cut to manufacture the insulating stay; because the moisture of the product is very low after hot pressing, the cut insulating stay is extremely easy to be wet, deformation phenomenon occurs, the product can have low strength and unqualified size when in use, and meanwhile, certain influence can be generated on the insulating property, particularly, certain quality hidden trouble exists at the high-voltage and high-field-intensity part.
Therefore, to overcome the above drawbacks and improve the mechanical and insulating properties of the product, the existing process must be modified.
The invention comprises the following steps:
The technical problems to be solved by the invention are as follows: the preparation method of the insulating stay overcomes the defects in the prior art, shortens the process time, improves the production efficiency, reduces the equipment energy consumption, ensures the stable mechanical property and electrical property of the product and does not deform when the insulating stays with different thicknesses are manufactured.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the preparation method of the insulating stay comprises the following steps:
a. veneer preparation: selecting the thickness and the number of the single plates according to the thickness of the product;
b. glue preparation: mixing phenol and formaldehyde in a weight ratio of 1:1 for polycondensation, dehydrating to water content of 13%, adding methanol in an amount which is one fourth of the total weight of the materials, and stirring to obtain glue;
c. Brushing glue: uniformly coating glue on the upper and lower surfaces of the paper board, and stacking the paper boards in the same longitudinal direction and transverse direction;
d. Pressing: setting an initial pressure as N 0,, an initial temperature as T1 according to the thickness of the product, setting the time from initial pressure rising to the time reaching a pressure set value as H1, maintaining the pressure as H2 after the pressure reaches the set pressure of N 0、, and finally releasing the pressure from the temperature of N 0、 to the pressure value of 0, setting the temperature as normal temperature and setting the time as H3;
e. cutting the pressed paperboard to obtain a final product; and (5) packaging in a rectangular packaging mode after cutting.
Preferably, the veneer in the step a does not need to be dried, the veneer is cut according to the required size of the final product, and the paper board is cut with allowance, so that no error is generated when the veneer is cut again according to the product requirement after the veneer is formed, and then the subsequent gluing and pressing are performed. The time required by the existing production process for drying and cooling (about 18H is required for drying and cooling) can be effectively reduced.
Preferably, the polycondensation reaction in the step b is carried out at normal temperature and normal pressure, and the reaction time of each ton of materials is 0.5H; the dehydration adopts vacuum dehydration, and the vacuum degree is 8 kilopascals; the viscosity of the obtained glue is 50 (+ -10) S, the solid content is 50 (+ -10)%, the volume resistivity is more than or equal to 1 x 10 12 omega cm, the surface resistivity is more than or equal to 1 x 10 12 omega, the dielectric loss is less than or equal to 4%, and the adhesive strength is more than or equal to 1.1 x 10 6 Pa.
Preferably, in the step c, the matching bonding is performed between the longitudinal direction and the longitudinal direction as well as between the transverse direction and the transverse direction of the paperboard, so that the flatness of the product is not affected by the difference of shrinkage rates in the longitudinal and transverse directions.
Preferably, insulating paper is laid on the upper and lower surfaces of the press in the step d for protection. Avoiding polluting the pressing plate due to glue overflow in the pressing process.
Preferably, the relationship between the thickness of the product in the step d and the hot pressing time is shown in table 1:
TABLE 1 relation between product thickness and hot press time
Preferably, the packaging mode in the step e is that the product is packaged in a rectangular shape, namely, each stay is piled up in order in the longitudinal and transverse directions, so that the stay is prevented from being distorted by external force.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. Compared with the glue used in the prior art, the methanol content of the glue adopted in the invention is reduced by 10%, and the water replaces part of the methanol content (about 10%), so that the volatilization amount of the methanol is reduced (the environment is protected), the pollution to the environment is effectively reduced, the water content of a finished product is also properly improved, the problems of lateral bending deformation and the like caused by too low water content of the finished product and damp in the atmosphere are avoided, the manufacturing period of the product is greatly reduced (compared with the traditional manufacturing process, the period is shortened by about 1/5), and the production efficiency is improved;
2. The manufacturing process adopted by the invention eliminates the process of gluing after the paperboard is dried in the oven and cooled in the prior art (the paperboard can be directly glued after being cut), saves energy and reduces the heat energy consumption;
3. according to the invention, a hot-pressing drainage procedure is adopted, so that the time of boosting and pressure relief is prolonged, the problem of interlayer cracking of the product caused by too fast pressure change can be prevented, and meanwhile, the bonding state of the interlayer glue is enhanced, so that the permeability of the glue is more excellent, and the improvement of the mechanical strength and the electrical strength of the product is facilitated;
4. The packaging mode is improved and optimized, and a rectangular packaging mode is adopted, so that the product cannot deform in a standing state and the verticality is ensured.
In a word, compared with the existing processing technology of the insulating stay, the processing technology of the insulating stay is more environment-friendly and energy-saving, the quality of the finished product is stable, the perpendicularity is good, and the evaluation of a client is high.
Drawings
FIG. 1 is a prior art 10mm thick insulated stay (dark colored cross braces, light colored control straight panel) after packaging;
FIG. 2 is the appearance of a 10mm thick insulated stay of the invention after packaging (dark colored cross braces, light colored control straight panels);
FIG. 3 is an unwrapped prior art 10mm thick insulated stay appearance;
fig. 4 is an unwrapped 10mm thick insulated stay of the present invention in appearance.
Detailed Description
The technical scheme of the invention is further described below by combining examples:
Example one preparation of glue
Adding 500 kg of phenol and 500 kg of formaldehyde into a reaction kettle, and performing polycondensation reaction in the reaction kettle at normal temperature and normal pressure for 0.5 hour; and (3) carrying out vacuum dehydration (the vacuum degree is 8 kpa) after the polycondensation reaction is finished, stopping dehydration when the water content is 13%, adding methanol with the weight of about 1/4 of the current material, stirring and diluting under the condition of normal temperature and normal pressure, and completely and uniformly mixing to obtain the finished glue. The glue has the following parameters: the glue has the viscosity of 50 (+ -10) S and the solid content of 50 (+ -10)%, the volume resistivity is more than or equal to 1 x 10 12 omega cm, the surface resistivity is more than or equal to 1 x 10 12 omega, the dielectric loss is less than or equal to 4%, and the adhesive strength is more than or equal to 1.1 x 10 6 Pa.
Example two production of 10mm insulation stays
A. Veneer preparation: taking 2 sheets of 4mm paperboards and 1 sheet of 2mm paperboards, and cutting according to the size of the product and the longitudinal and transverse directions;
b. brushing glue: brushing glue on two sides of the paper board, and orderly stacking the paper boards according to the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 120min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 300min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the pressure reduction is completed within 120min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. processing: slitting according to the size of the product, and packaging the slit product in a rectangular packaging mode.
Embodiment III, a manufacturing method of the 16mm insulating stay comprises the following steps:
a. Veneer preparation: 4 sheets of 4mm paper boards are taken, and the materials are cut according to the longitudinal direction and the transverse direction according to the size of the product;
b. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 120min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 300min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the pressure reduction is completed within 120min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
Fourth embodiment, the manufacturing method of the 18mm insulating stay comprises the following steps:
a. veneer preparation: 4 sheets of 4mm paperboards and 1 sheet of 2mm paperboards are taken, and according to the size of the product, the materials are cut in the longitudinal direction and the transverse direction;
b. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 120min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 300min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the pressure reduction is completed within 120min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
Fifth, the manufacturing method of the 26mm insulating stay comprises the following steps:
a. veneer preparation: 4 sheets of 5mm paperboards and 2 sheets of 3mm paperboards are taken, and according to the size of the product, the materials are cut in the longitudinal direction and the transverse direction;
b. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 150min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 360min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the depressurization is completed within 150min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
In the sixth embodiment, the manufacturing method of the 40mm insulating stay comprises the following steps:
a. Veneer preparation: taking 8 paper boards with the thickness of 5mm, and cutting according to the size of the product and the longitudinal and transverse directions;
b. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 150min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 360min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the depressurization is completed within 150min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
Seventh embodiment, the method for manufacturing the 45mm insulating stay comprises the following steps:
a. Veneer preparation: taking 9 paper boards with the thickness of 5mm, and cutting according to the size of the product and the longitudinal and transverse directions;
b. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
c. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 180min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 360min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the pressure reduction is completed within 180min, the temperature is reduced to the room temperature, and the pressing process is completed;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
Comparative example:
preparation of glue
Adding 500 kg of phenol and 500 kg of formaldehyde into a reaction kettle, and performing polycondensation reaction in the reaction kettle at normal temperature and normal pressure for 0.5 hour; and (3) carrying out vacuum dehydration (the vacuum degree is 8 kpa) after the polycondensation reaction is finished, stopping dehydration when the water content is 3%, adding methanol with the weight of about 1/4 of the current material, stirring and diluting under the condition of normal temperature and normal pressure, and completely and uniformly mixing to obtain the finished glue. The glue has the following parameters: the glue has the viscosity of 50 (+ -10) S and the solid content of 50 (+ -10)%, the volume resistivity is more than or equal to 1 x 10 12 omega cm, the surface resistivity is more than or equal to 1 x 10 12 omega, the dielectric loss is less than or equal to 4%, and the adhesive strength is more than or equal to 1.1 x 10 6 Pa.
The manufacturing method of the 40mm insulating stay comprises the following steps:
a. Veneer preparation: taking 8 paper boards with the thickness of 5mm, and cutting according to the size of the product and the longitudinal and transverse directions;
b. And (3) putting the cut strips into a hot air circulation drying box for drying at the drying temperature of 125 ℃ for 12H.
C. cooling the dried strips to a temperature: the temperature is less than or equal to 40 ℃.
D. Brushing glue: double-sided adhesive brushing is carried out on the paper boards, and the paper boards are orderly stacked in the longitudinal direction and the transverse direction;
e. Pressing: laying insulating paper on the surface of a pressing plate for protection, placing the paper board subjected to glue brushing on the pressing plate, placing Ji Luo of the paper board longitudinally and transversely, setting the initial pressure to be 4Mpa, setting the boosting time to be 120min, and raising the temperature from normal temperature to 140 ℃; maintaining the pressure for 360min after the pressure reaches 4Mpa, and keeping the temperature at 140 ℃; then, the pressure reduction is completed within 120min, the temperature is reduced to the room temperature, and the pressing process is completed; specific process parameters are shown in Table 2;
d. Processing: slitting according to the size of the product, and packaging the processed product in a rectangular packaging mode.
TABLE 2 relation between the thickness of the prior art product and the hot press time
The preparation of insulating stays with the thickness of 10mm and 26mm in the prior art is shown in the preparation process of the insulating stays with the thickness of 40mm and the technological parameters in table 2, and the specific process is not described in detail.
Comparison test:
The insulating stays with the thickness of 10mm, 26mm and 40mm produced by the invention and products with the same thickness prepared by the prior art in the comparative example are detected (the detection method refers to the 2 nd part of the national standard JB_T10443.2-2017 laminated paper board for electric use: test method), and the detection data are shown in Table 2:
TABLE 2 comparison of the test results data for the inventive and prior art products
The 10mm thick insulating stay produced by the invention has the same thickness as the product prepared by the prior art, and the appearance warp state is shown in figures 1 to 4.
Conclusion: as can be seen from the data, compared with the products in the prior art, the product prepared by the invention has similar compressibility and density, but the product of the invention has improved oil absorption, bending strength and electrical strength, the moisture of the product is also improved to a certain extent, and the deformation of the product of the invention is small and the verticality is high by comparing the two products, so that the product quality is obviously improved.
It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (6)
1. The preparation method of the insulating stay is characterized by comprising the following steps of:
a. veneer preparation: selecting the thickness and the number of the single plates according to the thickness of the product;
b. glue preparation: mixing phenol and formaldehyde according to a weight ratio of 1:1 for polycondensation reaction, dehydrating to water content of 13%, adding methanol with a quarter of the total weight of the materials, and stirring uniformly to obtain glue;
c. Brushing glue: uniformly coating glue on the upper and lower surfaces of the paper board, and stacking the paper boards in the same longitudinal direction and transverse direction;
d. Pressing: setting an initial pressure as N 0,, an initial temperature as T1 according to the thickness of the product, setting the time from initial pressure rising to the time reaching a pressure set value as H1, maintaining the pressure as H2 after the pressure reaches the set pressure of N 0、, and finally releasing the pressure from the temperature of N 0、 to the pressure value of 0, setting the temperature as normal temperature and setting the time as H3;
e. cutting the pressed paperboard to obtain a final product; and (5) packaging in a rectangular packaging mode after cutting.
2. The method for manufacturing an insulating stay according to claim 1, wherein: and a veneer in the step a does not need to be dried, and is cut according to the required size of the final product, and the paper board is cut with allowance.
3. The method for manufacturing an insulating stay according to claim 1, wherein: the polycondensation reaction in the step b is carried out at normal temperature and normal pressure, and the reaction time of each ton of materials is 0.5H; the dehydration adopts vacuum dehydration, and the vacuum degree is 8 kilopascals.
4. The method for manufacturing an insulating stay according to claim 1, wherein: and c, matching and bonding the paperboard in the step longitudinally with the longitudinal direction and the transverse direction.
5. The method for manufacturing an insulating stay according to claim 1, wherein: and d, paving insulating paper on the upper surface and the lower surface of the press in the step for protection.
6. The method for manufacturing an insulating stay according to claim 1, wherein: and e, the packaging mode in the step is that the product is packaged in a rectangular mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410104583.6A CN117922103A (en) | 2024-01-25 | 2024-01-25 | Preparation method of insulating stay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410104583.6A CN117922103A (en) | 2024-01-25 | 2024-01-25 | Preparation method of insulating stay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117922103A true CN117922103A (en) | 2024-04-26 |
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ID=90755353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410104583.6A Pending CN117922103A (en) | 2024-01-25 | 2024-01-25 | Preparation method of insulating stay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117922103A (en) |
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2024
- 2024-01-25 CN CN202410104583.6A patent/CN117922103A/en active Pending
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