WO2023231695A1

WO2023231695A1 - Method for rapid batch preparation of mica tape

Info

Publication number: WO2023231695A1
Application number: PCT/CN2023/092317
Authority: WO
Inventors: 王忠伟; 封玉龙; 朱焕铮; 陈东
Original assignee: 中广核达胜加速器技术有限公司
Priority date: 2022-06-02
Filing date: 2023-05-05
Publication date: 2023-12-07
Also published as: CN114843050A

Abstract

The present invention provides a method for rapid batch preparation of a mica tape, comprising: S1, placing mica paper on a table board, and pasting a plurality of reinforcing bands on the mica paper side by side; S2, cutting the mica paper to form a plurality of strips of mica paper for later use; S3, cutting a glass fiber fabric for later use; S4, combining the glass fiber fabric with a first adhesive, and uniformly permeating the glass fiber fabric; S5, flatwise placing the strips of mica paper in step S2 on one side of the glass fiber fabric, and uniformly permeating; S6, combining the mica paper with a second adhesive, and uniformly permeating to form a semi-finished mica tape; and S7, carrying out irradiation operation on the semi-finished mica tape to obtain a finished mica tape. When the mica tape is machined by using the method, it can be guaranteed that the mica paper has certain strength, the risk that the mica paper is damaged in the machining process is reduced, the production cost is reduced, when the mica tape is manufactured in a laboratory, qualified test products can be manufactured, the accuracy of test data is guaranteed, and the reliability of test is improved.

Description

A method for rapid batch preparation of mica tape

Technical field

The present invention relates to a manufacturing technology of mica tapes, and in particular to a method for rapid batch preparation of mica tapes in a laboratory.

Background technique

Mica tape is an insulating material with excellent high temperature resistance and combustion resistance, which is made of reinforcing materials such as mica paper and glass fiber cloth, mixed with appropriate adhesives, dried at high temperature and then cut into pieces. Due to its good flexibility and high temperature resistance, mica tape is widely used in the fire-resistant insulation layer of various fire-resistant electromagnetic cables and coils. The current mainstream method of producing mica tape is to use a large amount of toluene solvent to dilute the adhesive, then impregnate the reinforcing material so that the reinforcing material can be compounded with the mica paper, and then bake the compounded material to remove the solvent, and the resulting material Rolled and cut into pieces.

Since the strength of mica paper is very low, force in any direction can cause the mica paper to break. Innovating the existing mica tape production process on the production line requires huge investment in material costs, labor costs, and equipment costs, and small batches It is difficult for production (such as laboratories) to prepare products for testing. On the other hand, existing mica tapes are mainly diluted with toluene solvent, which poses huge safety hazards and cost expenses. There is an urgent need for innovation in the existing production process. Therefore, technological innovation in the production process of existing mica tapes has attracted widespread attention. . How to repeatedly and batch-produce samples for performance testing in the laboratory has become the first issue in whether technological innovation can be carried out smoothly.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for quickly batch preparing mica tapes that reduces damage to mica paper and reduces testing costs during the production process of mica tapes.

The technical solution adopted by the present invention to solve the technical problem is: a method for quickly preparing mica tape in batches. The steps of the method are:

S1. Take a large piece of mica paper and place it on a clean table. Place it at a set distance on the mica paper. Paste several reinforcing strips side by side;

S2. Cut the reinforcing tape along the pasting direction of the reinforcing tape to form several strips of mica paper with reinforcing tapes on both sides and mica paper in the middle, for later use;

S3. Cut the fiberglass cloth as required and set aside;

S4. Combine the glass fiber cloth with the first adhesive and penetrate it evenly;

S5. Take out the infiltrated glass fiber cloth, and lay the strip mica paper in step S2 flatly on one side of the glass fiber cloth to infiltrate evenly;

S6. Combine the side of the mica paper away from the glass fiber cloth with the second adhesive and penetrate evenly to form a semi-finished mica tape;

S7. Irradiate the semi-finished mica tape to obtain the finished mica tape.

Further specifically, the reinforcing tape is a paper tape, and the width of the paper tape is 0.5-4cm.

More specifically, the cutting position in step S2 is the center position of the reinforcing belt in the width direction.

Further specifically, the time for uniform penetration in steps S4, S5, and S6 is controlled to be 10-50 s.

Further specifically, the uniform penetration time in steps S4, S5, and S6 is controlled at 30 seconds.

Further specifically, the composition and mass fraction of the first adhesive are,

Further specifically, the composition and mass fraction of the second adhesive are,

Further specifically, in the step S7, the irradiation operation adopts one of electron beam curing, ultraviolet curing and thermal curing.

Further specifically, the reinforcing belts are arranged in parallel.

More specifically, after step S7, the reinforcing tapes on both sides of the finished mica tape are cut off.

The beneficial effects of the present invention are: when using the above method to process mica tape, it can ensure that the mica paper has a certain strength, reduce the risk of the mica paper being damaged during the processing, and can reduce the production cost in actual production. When produced in the laboratory, qualified test products can be produced to further ensure the accuracy of test data and improve the reliability of the test.

Description of the drawings

Figure 1 is a flow chart of the method for rapidly batch preparing mica tapes according to the present invention.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

As shown in Figure 1, a method for quickly preparing mica tapes in batches. The steps of this method are:

S1. Take a large piece of mica paper and place it on a clean table. The table should be clean and dust-free to prevent contamination of the mica paper. Paste several reinforcing strips side by side on the mica paper at a set distance; among them, the width of the reinforcing strips can be between 0.5- Choose between 4cm, which can be operated according to specific working conditions. At the same time, the reinforcing tape can be a product with its own glue such as paper tape, PVC tape, or it can be pasted by applying glue on the strip paper; according to actual needs, The reinforcing belts can be set in parallel, and the distance between the two reinforcing belts can also be set according to needs.

S2. Cut the reinforcement belt along the direction where the reinforcement belt is pasted to form reinforcement belts on both sides. Several strips of mica paper with mica paper in the middle are reserved; the cutting position can be at any position in the width direction of the reinforcing belt. The main purpose is to ensure that the mica paper in the middle has a certain strength through the reinforcing belts on both sides. It is easy to break; in this solution, its position is selected as the middle position in the width direction of the reinforcing belt, and one reinforcing belt is cut into two reinforcing belts. The widths of the two reinforcing belts are equal or slightly deviated.

S3. Take out the glass fiber cloth. The glass fiber cloth here is the base for carrying the mica paper. According to the size of the reinforced belt after cutting, cut the glass fiber cloth as required.

S4. Combine the cut glass fiber cloth with the first adhesive. The combination method can be immersion or coating, and penetrate evenly. The penetration time is 10-50s, preferably 20s, 30s or 40s; When the immersion type is selected, the time to control uniform penetration is slightly shorter (10-20s). When the coating type is selected, the time to control uniform penetration is slightly longer (40-50s).

S5. Take out the infiltrated glass fiber cloth, and lay the strip mica paper in step S2 flatly on one side of the glass fiber cloth to infiltrate evenly. The infiltration time is 10-50s, preferably 20s or 30s.

S6. Combine the side of the mica paper away from the glass fiber cloth with the second adhesive. The bonding method here is a coating method and is evenly penetrated. The penetration time is 10-50s, preferably 30s or 40s, to form mica. With semi-finished products.

S7. Perform irradiation operation on the semi-finished mica tape to obtain the finished mica tape; the irradiation operation can be carried out in a variety of ways, such as electron beam curing (EB), ultraviolet curing (UV), and thermal curing.

After the mica tape is formed by the above method, the reinforcing tapes on both sides of the mica tape can be cut off by slitting.

In the above method, the first adhesive and the second adhesive can be the same or different adhesives; when different adhesives are used,

The composition and mass parts of the first adhesive are,

The composition and mass fraction of the second adhesive are,

When making refractory cables, the main function of silicon-containing substances such as vinyl silicone oil and fumed silica is to enable the mica tape to pass the resistance test after burning. That is, the refractory cable needs to be burned with electricity to ensure that it will The carbon content in the ash should be as low as possible. If the carbon content is too high, there will be a risk of short circuit. The main purpose of the first adhesive in this application is to ensure the full infiltration of the glass fiber cloth and the bonding between the glass fiber cloth and the mica paper. In fire-resistant cables, the glass fiber cloth is not in direct contact with the wires and does not require high carbon content after combustion. At the same time, the cost of vinyl silicone oil and fumed silica is higher than that of other organic substances, so the first adhesive is used. Vinyl silicone oil and fumed silica are relatively reduced, which can reduce costs.

At the same time, the viscosity of the first adhesive is 1000-20000cps, and the viscosity of the second adhesive is 10-1000cps. Using a higher viscosity first adhesive can ensure the bonding strength between the glass fiber cloth and the mica paper. At the same time, the amount of glue absorbed by the porous mica paper is reduced, and the use of a lower viscosity second adhesive can ensure that the mica paper absorbs the second adhesive evenly and fully.

When the contents of vinyl silicone oil and fumed silica in the first adhesive are not 0, the adhesive used in steps S4 and S6 can be selected from the above formulas.

Based on the above method, a mica tape with low cost and good testing effect can be obtained. The laboratory preparation is explained below.

First, place a large piece of mica paper flat on a clean glass sheet. Take a 2cm wide piece of paper tape and gently stick the paper tape on one side of the mica paper and stick it firmly. There are 5 strips of paper tape on it. And be parallel to each other, and ensure that the distance between adjacent paper tapes is the same.

Second, use a cutter to cut the middle of the paper tape along the length of the paper tape to form 6 strips of mica paper. Take the middle 4 strips of mica paper with paper tape on both sides for later use;

Third, take the fiberglass cloth and cut it into strips as needed and set aside;

Fourth, drop 10g of the first adhesive on the clean glass piece, and use a 20 μm wire rod to spread the first adhesive;

Fifth, place the strip of glass fiber cloth on the first adhesive and let it penetrate evenly for 30 seconds;

Sixth, place the strip of mica paper flatly on the glass fiber cloth, and soak it evenly for 30 seconds again, and set aside;

Seventh, drop 10g of the second adhesive on the clean glass piece, and use a 50μm wire rod to spread the second adhesive;

Eighth, take out the glass fiber cloth and mica paper in step 6, place the mica paper flatly with one side facing the second adhesive, and let it penetrate evenly for 30 seconds to form a semi-finished mica tape;

Ninth, EB irradiation equipment is used to irradiate the semi-finished mica tape. The irradiation electron beam energy is 100-400kev and the irradiation dose is 40-80kGy to obtain the finished mica tape.

Example 1

According to the above laboratory production method, the first adhesive and the second adhesive use the same adhesive. The formula of the adhesive is:

Obtain the corresponding finished mica tape and test it to obtain the corresponding technology for the mica tape. Effect.

Example 2

According to the above laboratory production method, the first adhesive and the second adhesive use different adhesives, where the formula of the first adhesive is:

The formula of the second adhesive is,

Obtain the corresponding finished mica tape and test it to obtain the corresponding technical effects of the mica tape.

Example 3

The formula of the second adhesive is,

Comparative example 1

According to the above experimental method, without using paper tape, the first adhesive and the second adhesive use the same adhesive. The formula of the adhesive is:

Comparative example 2

According to the above experimental method, paper tape is used, and the first adhesive and the second adhesive are different adhesives. The formula of the first adhesive is:

The formula of the second adhesive is,

The corresponding finished mica tape was obtained and tested to obtain the corresponding technical effects of the mica tape. It is proved here that the second adhesive must contain silica gel substances.

Comparative example 3

Purchase the finished mica tape from the market and test it to obtain the corresponding technical effects of the mica tape.

The technical effects obtained based on the above-mentioned Embodiments 1, 2, and 3 and Comparative Examples 1, 2, and 3 are formed into the following table.

It can be concluded from the above table that the performance of Examples 1, 2, and 3 is basically the same as that of commercially available products, and the performance is greatly increased compared with Comparative Examples 1 and 2.

In summary, the above method can provide a simple preparation method for laboratory research and development of mica tapes. At the same time, the performance is consistent with normal products, which greatly shortens the laboratory research and development time. In addition, enterprises can quickly prepare batches in the laboratory, which can Quick and effective quality control of raw material quality on the production line.

It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are It still falls within the scope of the technical solution of the present invention.

Claims

A method for quickly preparing mica tape in batches, characterized in that the steps of the method are:

S1. Take a large piece of mica paper and place it on a clean table, and paste a number of reinforcing tapes side by side on the mica paper at a set distance;

S2. Cut the reinforcing tape along the pasting direction of the reinforcing tape to form several strips of mica paper with reinforcing tapes on both sides and mica paper in the middle, for later use;

S3. Cut the fiberglass cloth as needed and set aside;

S4. Combine the glass fiber cloth with the first adhesive and penetrate it evenly;

S5. Take out the infiltrated glass fiber cloth, and lay the strip mica paper in step S2 flatly on one side of the glass fiber cloth to infiltrate evenly;

S6. Combine the side of the mica paper away from the glass fiber cloth with the second adhesive and penetrate evenly to form a semi-finished mica tape;

S7. Irradiate the semi-finished mica tape to obtain the finished mica tape.
The method for rapidly batch preparing mica tape according to claim 1, characterized in that the reinforcing tape is a paper tape, and the width of the paper tape is 0.5-4cm.
The method for rapid batch preparation of mica tapes according to claim 2, characterized in that the cutting position in step S2 is the center position in the width direction of the reinforcing tape.
The method for rapid batch preparation of mica tape according to claim 1, characterized in that the uniform penetration time in steps S4, S5, and S6 is controlled at 10-50 s.
The method for rapid batch preparation of mica tape according to claim 4, characterized in that the uniform penetration time in steps S4, S5 and S6 is controlled to 30 seconds.
The method for rapidly batch preparing mica tape according to claim 1, characterized in that the composition and mass fraction of the first adhesive are,
The method for rapidly batch preparing mica tape according to claim 1, characterized in that the composition and mass fraction of the second adhesive are,
The method for rapidly batch preparing mica tapes according to claim 1, characterized in that in step S7, the irradiation operation adopts one of electron beam curing, ultraviolet curing and thermal curing.
The method for rapidly batch preparing mica tapes according to claim 1, characterized in that the reinforcing tapes are arranged in parallel.
The method for rapidly batch preparing mica tape according to claim 1, characterized in that, after the step S7, the reinforcing tapes on both sides of the finished mica tape are cut off.