A method for manufacturing a mica tape

Abstract

The application provides a mica tape preparation method and belongs to the technical field of electrical insulating materials; a mica tape preparation method, wherein a reinforcing material is dipped into a glue tank, then laminated with mica paper, glue is dropped on the surface, the mica tape is baked in a multi-section drying oven, and then cooled, cut and wound; the mica tape with good viscosity, softness, non-easy-to-disperse tray and convenient-to-extract wrapping is obtained by improving the glue formula and the preparation process of the traditional mica tape preparation process; the micro-bubble particles containing carbon dioxide are added into the glue of the application, so that the mica tape also has certain flame retardance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical insulation materials, more particularly, to a preparation method of mica tape. BACKGROUND

[0002] Mica tape, also known as fire-resistant mica tape, is a kind of fire-resistant insulation material, which has excellent high-temperature resistance and combustion resistance, and is suitable for the main fire-resistant insulation layer in various fire-resistant cables. The mica tape is an insulation material obtained by bonding a reinforcing material and mica paper together through an adhesive and then cutting into a tape shape.

[0003] The mica tapes sold on the market are all wound into rolls in an orderly manner, which is mainly to facilitate winding on cables or motors to form an insulation layer and achieve the effect of fire resistance and high-temperature resistance during use. However, in reality, normal mica tapes cannot retain moisture and must be dried 100% during production to avoid quality problems, so the produced mica tapes are relatively dry and hard, with a hard hand feel and no texture. Moreover, during the wrapping process, the mica tapes are not sticky and flexible, and the entire roll of tape material can easily fall off, which not only causes inconvenience in wrapping, but also makes the scattered mica tapes easy to get dirty or affected by the environment, resulting in poor quality.

[0004] Therefore, it is necessary to find a mica tape with stickiness and good operability. SUMMARY

[0005] The present application aims to overcome at least one of the above-mentioned defects of the prior art, and provides a method for preparing a mica tape, which has self-adhesion and good softness and is not easy to scatter during use.

[0006] The technical solution adopted by the present application is a preparation method of mica tape, in which the reinforcing material is immersed in a glue tank, then bonded with mica paper, and then surface-dropped with glue and baked in a multi-stage drying oven, and finally cooled, cut and wound.

[0007] In the present application, the reinforcing material is bonded with mica paper after being immersed in glue, and the surface-dropped glue and the baking temperature and time are cooperated with each other, so that the mica tape has sufficient viscosity and does not stick to each other, and the viscosity of the mica paper surface and the viscosity of the glass fiber cloth are just right, which is not easy to scatter and can be easily extracted and wrapped.

[0008] In the present application, the gluing method of the reinforcing material can also be brushing or other methods, and is not limited to immersion.

[0009] Further, the reinforcing material is one of alkali-free environment-friendly glass fiber cloth, polyester film and polyimide film.

[0010] Preferably, the reinforcing material is an alkali-free environmentally friendly glass cloth.

[0011] Further, the glue includes silicone glue, solvent and curing agent.

[0012] The curing agent is a cross-linking agent, which can quickly cure the prepared glue into a shape, and has the effect of stable viscosity and not easy to migrate.

[0013] The silicone glue is organic silicone 905 from Tongchuang Chemical Co., Ltd., which has good high-temperature resistance, stability, weather resistance, moisture resistance and electrical insulation, etc.

[0014] Further, the mass ratio of the silicone glue to the solvent in the glue is 1:1.8-3, and the curing agent is 1wt% of the silicone glue.

[0015] Preferably, the mass ratio of the silicone glue to the solvent in the glue is 1:2.5.

[0016] Further, the curing agent is one or a combination of several of γ-aminopropyl trimethoxysilane, 3-aminopropyl trimethoxysilane, 3-aminopropyl triethoxysilane, γ-diethylene triamine propyl methyl dimethoxysilane, N-2-aminoethyl-3-aminopropyl trimethoxysilane, N-2-aminoethyl-3-aminopropyl methyl dimethoxysilane, N-2-aminoethyl-3-aminopropyl methyl dimethoxysilane, γ-aminopropyl methyl diethoxysilane, N-(β-aminoethyl)-3-aminopropyl methyl dimethoxysilane, N-(2-aminoethyl)-3-aminopropyl triethoxysilane, 3-aminopropyl methyl dimethoxysilane, 3-aminopropyl methyl diethoxysilane, N-n-butyl-3-aminopropyl trimethoxysilane, N-n-butyl-3-aminopropyl triethoxysilane, bis-[3-(trimethoxysil)-propyl]-amine, bis-[3-(triethoxysil)-propyl]-amine, 3-anilino propyl trimethoxysilane, 3-(phenylamino) propyl triethoxysilane, 3-diethylamino propyl trimethoxysilane, N,N-dimethyl-3-aminopropyl trimethoxysilane, diethylene triamine propyl trimethoxysilane, N-cyclohexyl-γ-aminopropyl trimethoxysilane, N-cyclohexyl-γ-aminopropyl methyl dimethoxysilane, bis-aminoethyl aminopropyl trimethyl siloxane, polyamino alkyl trialkoxysilane, amino-modified polysiloxane, ethylenediamine, diethylamine, tetramethyl dipyridine triamine.

[0017] Further, the solvent is one or a combination of several of toluene, xylene, ethyl acetate, isopropyl alcohol.

[0018] Preferably, the solvent is xylene.

[0019] Further, the viscosity of the silicone glue is 450000-600000 mPa.s, and the solid content is 58-62%.

[0020] Further, the glue further comprises lipid microbubbles. The lipid microbubbles are 1-5 times the mass of the silicone glue.

[0021] The lipid microbubble shell is a phospholipid component. The phospholipid shell material itself can provide certain flame retardancy, and when heated and destroyed, it can instantaneously release the gas carbon dioxide wrapped therein, thereby rapidly limiting the oxygen supply in the combustion environment to achieve the flame retardant effect.

[0022] Further, the preparation method of the lipid microbubble is as follows:

[0023] (1) Take DPPC, DSPE-PEG5000 and DPPA according to the mass ratio of 1g:5g:1g, dissolve in 10ml chloroform, seal and ultrasonic oscillation for 1min, and get the phospholipid dispersion;

[0024] (2) The phospholipid dispersion is evaporated under the condition of 60℃, the pressure is 0.1Mpa, the rotating speed is 120r / min, and the time is 45min. When a uniform milky white film is formed, it is obtained;

[0025] (3) Wash the hydrated with 5ml PBS, and then put it in a sealed bottle;

[0026] (4) Replace the air in the bottle with CO2 gas, then oscillate for 1min. And centrifuge twice at 500rpm / min to obtain purified lipid microbubbles loaded with CO2.

[0027] (5) Dilute the lipid microbubbles in water at a ratio of 10% to obtain the lipid microbubble component reagent.

[0028] Further, the steps include:

[0029] S1: Prepare the glue and put it into the glue tank for standby;

[0030] S2: Dip the reinforcing material in the glue tank, and after dipping, adhere to the mica sheet to obtain a semi-finished product;

[0031] S3: Two times of glue filling are performed on one side of the semi-finished reinforcing material;

[0032] S4: Put the semi-finished product after glue filling into a 6-section oven for baking to obtain a mica tape initial product;

[0033] S5: Cooling, winding and slitting to obtain the mica tape.

[0034] Further, the specific steps are as follows:

[0035] S1: proportionally add silicone glue, solvent, curing agent in a stirrer, stir uniformly, and put into a glue tank for standby;

[0036] S2: soak the reinforcing material in the glue tank in S1 for 3-5 min, take out and drain, and adhere to a mica sheet to obtain a semi-finished product;

[0037] S3: use a gluing device to glue twice on one side of the semi-finished reinforcing material;

[0038] S4: put the semi-finished product after gluing into a 6-section oven for continuous baking, the first section baking temperature is 85-95 DEG C, the second section baking temperature is 100-105 DEG C, the third section baking temperature is 108-113 DEG C, the fourth section, the fifth section and the sixth section baking temperature is 115-120 DEG C, the first section, the second section and the third section baking time are 1-3 min respectively, and the fourth section, the fifth section and the sixth section baking time are 2-5 min respectively.

[0039] S5: naturally cool the mica tape initial product obtained in S4, correct deviation through a corrector, roll through a transmission shaft and a compression roller, and then roll into a roll shape, and after detection, cut and wind.

[0040] In the preparation process of the mica tape, the two surface glue dropping can increase the absorption of glue amount and effectively remain part on the surface, and play the adhesive performance. The first surface glue dropping can make the permeability of the mica paper reach 70%, and the second surface glue dropping can make the permeability of the mica paper reach 95%.

[0041] In step S4, the purpose of the first section, the second section and the third section baking is to volatilize the solvent, and the purpose of the fourth section, the fifth section and the sixth section baking is high-temperature curing and crosslinking.

[0042] Further, the application also provides the composite mica tape obtained by any one of the preparation methods.

[0043] Compared with the prior art, the application has the beneficial effects that: the application is improved by the glue formula and the preparation process in the preparation process of the traditional mica tape, and a mica tape with good adhesive and softness, which is not easy to scatter and is convenient to extract and wrap, is obtained; the glue of the application also adds microbubble particles containing carbon dioxide, so that the mica tape also has certain flame retardance. DETAILED DESCRIPTION

[0044] The embodiments of the application are only used for example illustration, and cannot be understood as limitation to the application.

[0045] Example 1

[0046] A mica tape preparation method comprising the following steps: S1: adding silicone glue (Tongchuang Chemical Silicone 905, viscosity 540000 mPa.s, solid content 60%) 1 part, solvent (xylene) 2.5 parts, curing agent (γ-diethylene triamine propyl methyl dimethoxysilane) 0.01 parts in a stirrer, stirring uniformly, and placing in a glue tank for standby;

[0047] S2: soaking the reinforcing material in the glue tank in S1 for 3 min, taking out and draining, and adhering to the mica sheet to obtain a semi-finished product;

[0048] S3: using a gluing device to glue twice on one side of the semi-finished reinforcing material;

[0049] S4: placing the semi-finished product after gluing into a 6-section oven for continuous baking, the first section baking temperature is 90℃, the second section baking temperature is 105℃, the third section baking temperature is 110℃, the fourth section, the fifth section and the sixth section baking temperature is 120℃; the first section, the second section and the third section baking time are 1 min respectively, and the fourth section, the fifth section and the sixth section baking time are 2 min respectively.

[0050] S5: naturally cooling the mica tape initial finished product obtained in S4, correcting through a correcting device, rolling through a transmission shaft and a compression roller, and winding into a roll shape, and after detection, cutting and winding.

[0051] Example 2

[0052] A mica tape preparation method comprising the following steps:

[0053] S1: adding silicone glue (Tongchuang Chemical Silicone 905, viscosity 540000 mPa.s, solid content 60%) 1 part, solvent (toluene) 1.8 parts, curing agent (γ-aminopropyl trimethoxysilane) 0.01 parts in a stirrer, stirring uniformly, and placing in a glue tank for standby;

[0054] S2: soaking the reinforcing material in the glue tank in S1 for 5 min, taking out and draining, and adhering to the mica sheet to obtain a semi-finished product;

[0055] S3: using a gluing device to glue twice on one side of the semi-finished reinforcing material;

[0056] S4: placing the semi-finished product after gluing into a 6-section oven for continuous baking, the first section baking temperature is 85℃, the second section baking temperature is 100℃, the third section baking temperature is 108℃, the fourth section, the fifth section and the sixth section baking temperature is 115℃; the first section, the second section and the third section baking time are 3 min respectively, and the fourth section, the fifth section and the sixth section baking time are 5 min respectively.

[0057] S5: The mica tape initial product obtained in S4 is naturally cooled, rectified by a rectifier, rolled into a roll shape after rolling by a transmission shaft and a compression roller, and cut and wound after passing detection.

[0058] Example 3

[0059] A mica tape preparation method comprises the following steps:

[0060] S1: In a stirrer, 1 part of silicone glue (Tongchuang Chemical Silicone 905, viscosity 540000 mPa.s, solid content 60%), 3 parts of solvent (toluene), and 0.01 part of curing agent (γ-aminopropyl trimethoxysilane) are added and stirred uniformly, and then put into a glue tank for standby;

[0061] S2: The reinforcing material is soaked in the glue tank in S1 for 4 min, taken out and drained, and then attached to the mica sheet to obtain a semi-finished product;

[0062] S3: The semi-finished product reinforcing material is supplemented with glue twice by using a gluing device;

[0063] S4: The semi-finished product after gluing is put into a 6-section oven for continuous baking, the first section is baked at 95℃, the second section is baked at 102℃, the third section is baked at 113℃, and the fourth section, the fifth section, and the sixth section are baked at 118℃; the baking time of the first section, the second section, and the third section is 2 min, and the baking time of the fourth section, the fifth section, and the sixth section is 3 min.

[0064] S5: The mica tape initial product obtained in S4 is naturally cooled, rectified by a rectifier, rolled into a roll shape after rolling by a transmission shaft and a compression roller, and cut and wound after passing detection.

[0065] Example 4

[0066] A mica tape preparation method comprises the following steps:

[0067] S1: In a stirrer, 1 part of silicone glue (Tongchuang Chemical Silicone 905, viscosity 540000 mPa.s, solid content 60%), 2.5 parts of solvent (xylene), 0.01 parts of curing agent (γ-diethylenetriamine propyl methyl dimethoxysilane), and 3 parts of lipid microbubbles are added and stirred uniformly, and then put into a glue tank for standby;

[0068] S2: The reinforcing material is soaked in the glue tank in S1 for 3 min, taken out and drained, and then attached to the mica sheet to obtain a semi-finished product;

[0069] S3: The semi-finished product reinforcing material is supplemented with glue twice by using a gluing device;

[0070] S4: the semi-finished product after the glue filling is put into a 6-section oven for continuous baking, the first section baking temperature is 90 DEG C, the second section baking temperature is 105 DEG C, the third section baking temperature is 110 DEG C, the fourth section, the fifth section and the sixth section baking temperature is 120 DEG C; the first section, the second section, the third section baking time is 1 min, the fourth section, the fifth section, the sixth section baking time is 2 min.

[0071] S5: the mica tape initial product obtained in S4 is naturally cooled, is corrected by a correcting device, is rolled after being pressed by a transmission shaft and a compression roller, and is wound into a roll shape, and after being detected to be qualified, is slit and wound;

[0072] The preparation method of the lipid microbubble is as follows:

[0073] (1) DPPC, DSPE-PEG5000 and DPPA are weighed according to the mass ratio of 1g:5g:1g, dissolved in 10ml chloroform, sealed and ultrasonically oscillated for 1min to obtain a phospholipid dispersion;

[0074] (2) the phospholipid dispersion is rotary evaporated under the condition of 60 DEG C, the pressure is 0.1Mpa, the rotation speed is 120r / min, and the time is 45min, when a uniform milky white film is formed, it is obtained;

[0075] (3) the hydrated water is eluted with 5ml PBS, and then is placed in a sealed bottle;

[0076] (4) CO2 gas is introduced to replace the air in the bottle, and then is oscillated for 1min. And is centrifuged twice at 500rpm / min to obtain the purified lipid microbubble loaded with CO2.

[0077] (5) the lipid microbubble is diluted in water at a proportion of 10%, which is the lipid microbubble component reagent.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that no curing agent (γ-diethylene triamine propyl methyl dimethoxy silane) is contained, and the others are the same as Example 1.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that the addition amount of the solvent (dimethylbenzene) is 6 parts, and the others are the same as Example 1.

[0082] The mica tapes prepared in Examples 1-4 and Comparative Examples 1-2 are wound into a disc for wrapping test, and the test results show that the mica tapes prepared in Examples 1-4 can be easily pulled out during the wrapping process after being wound into a disc, and meanwhile, the mica tapes will not scatter, and the wrapping speed is obviously accelerated; the mica tapes prepared in Comparative Example 1 are difficult to pull out between adjacent two layers during the wrapping process after being wound into a disc, and it is necessary to pull out part of the mica tapes first and then wrap, or one person pulls the tapes and the other person wraps, and the efficiency is obviously reduced. While the mica tapes prepared in Comparative Example 2 are easy to pull out during the wrapping process after being wound into a disc, but the tapes will also scatter, that is, the mica tape disc prepared in Comparative Example 2 will scatter due to too small adhesion.

[0083] The mica tapes prepared in Examples 1-4 and Comparative Examples 1-2 are subjected to flame retardant performance test, including oxygen index, heat resistance temperature and other indicators of flame retardant performance test, and the results show that there is no significant difference between Examples 1-3, and Examples 1-3 have significant difference compared with Comparative Examples 1-2, the flame retardant performance of Examples 1-3 is better than that of Comparative Examples 1-2, and Example 4 performs better than Examples 1-3.

[0084] The mica tapes prepared in the present application are improved by improving the glue formula and the production process, and after being wound into a disc, the mica tapes between adjacent layers have a certain adhesion, but the adhesion is just right, which facilitates the rapid unwinding during the wrapping process and meanwhile prevents the disc from scattering, and greatly accelerates the wrapping speed; the micro-bubbles capable of quickly releasing carbon dioxide are added to the glue of the present application, so that the mica tapes have better flame retardant effect.

[0085] Obviously, the above embodiments of the present application are only examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific embodiments of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing mica tape, characterized in that, After the reinforcing material is immersed in the glue tank, it is bonded to the mica paper, glue is applied to the surface, and then it is baked in a multi-stage drying oven, cooled, slit and rolled up. The reinforcing material is one of the following: alkali-free environmentally friendly fiberglass cloth, polyester film, and polyimide film. The adhesive comprises silicone rubber, solvent, curing agent, and lipid microbubbles. The silicone rubber has a viscosity of 450,000–600,000 mPa·s and a solid content of 58–62%. The mass ratio of silicone rubber to solvent is 1:1.8–3. The curing agent is 1 wt% silicone rubber. The lipid microbubbles have a mass of 1–5 times the mass of silicone rubber. The preparation method of the lipid microbubbles is as follows: (1) Weigh DPPC, DSPE-PEG5000 and DPPA in a mass ratio of 1:5:1, dissolve them in 10 mL of chloroform, seal and sonicate for 1 min to obtain phospholipid dispersion; (2) The phospholipid dispersion was evaporated under reduced pressure at 60°C, with a pressure of 0.1 MPa, a rotation speed of 120 r / min, and a time of 45 min. The phospholipid dispersion was obtained when a uniform milky white film was formed. (3) Wash with 5 ml PBS to dehydrate, and then place in a sealed bottle; (4) Introduce CO2 gas to replace the air in the bottle, then shake for 1 min and centrifuge twice at 500 rpm to obtain purified lipid microbubbles loaded with CO2.

2. The method for preparing mica tape according to claim 1, characterized in that, The curing agent is γ-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane, N-2-aminoethyl-3-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-(β-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-2-aminoethyl ... Triethoxysilane, bis-[3-(trimethoxysilane)-propyl]-amine, bis-[3-(triethoxysilane)-propyl]-amine, 3-anilinepropyltrimethoxysilane, 3-(phenylamino)propyltriethoxysilane, 3-diethylaminopropyltrimethoxysilane, N,N-dimethyl-3-aminopropyltrimethoxysilane, diethylenetriaminopropyltrimethoxysilane, N-cyclohexyl-γ-aminopropyltrimethoxysilane, N-cyclohexyl-γ-aminopropylmethyldimethoxysilane, amino-modified polysiloxane, ethylenediamine, diethylamine, tetramethyldipropylenetriamine, or a combination of several of these.

3. The method for preparing mica tape according to claim 1, characterized in that, The solvent is one or a combination of toluene, xylene, ethyl acetate, and isopropanol.

4. A method for preparing mica tape according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Prepare the glue and put it into the glue tank for later use; S2: Place the reinforcing material in the glue tank and immerse it. After immersion, bond it to the mica sheet to obtain a semi-finished product. S3: Apply adhesive twice to one side of the semi-finished reinforcing material; S4: Place the semi-finished product with glue applied into a 6-section oven for baking to obtain the initial finished mica tape. S5: Cooling, winding, and slitting to obtain the mica tape.

5. The method for preparing mica tape according to claim 4, characterized in that, The specific steps are as follows: S1: Add silicone, solvent, curing agent and lipid microbubbles to a mixer in proportion, stir well, and put into the glue tank for later use; S2: Soak the reinforcing material in the glue tank in S1 for 3-5 minutes, take it out and drain it, then bond it with the mica sheet to obtain a semi-finished product; S3: Apply adhesive twice to one side of the semi-finished reinforcing material using an adhesive applicator; S4: Place the semi-finished product with glue applied into a 6-section oven for continuous baking. The baking temperature of the first section is 85-95℃, the baking temperature of the second section is 100-105℃, the baking temperature of the third section is 108-113℃, and the baking temperature of the fourth, fifth and sixth sections is 115-120℃. The baking time of the first, second and third sections is 1-3 minutes each, and the baking time of the fourth, fifth and sixth sections is 2-5 minutes each.