CN111320734B - Method for reducing volatile content in resin - Google Patents

Abstract

The present invention provides a method for reducing volatile content in resin. The method includes: step 1, setting up a multi-roller assembly, the multi-roller assembly including at least two pressing rollers; step 2, placing resin on any one of the multi-roller assemblies group between adjacent pressing rollers, and control multiple pressing rollers of the multi-roll assembly to roll, wherein the temperature of any pressing roller is lower than the resin curing temperature; step 3, measure the distance between the adjacent pressing rollers according to the set time The volatile content in the resin, before the volatile content meets the requirements for use, adjust the spacing between the adjacent pressing rollers according to the volatile content, wherein the volatile content is negatively correlated with the spacing . The method provided by the invention is simple and feasible, and the volatile content removal efficiency is high, the obtained resin does not affect subsequent use, and the technical problems existing in the existing resin volatile content removal method can be solved.

Description

Method for reducing volatile content in resin

technical field

The invention belongs to the technical field of composite materials, and in particular relates to a method for reducing volatile content in resin.

Background technique

There may be excess phenolic substances in the resin (usually referred to as phenolic resin), and a certain amount of solvent needs to be mixed in the production process for the convenience of discharging. This is the main component of volatile matter in phenolic resin. The resin can directly prepare the prepreg by the wet method, and then the solvent in the prepreg can be removed by drying. However, with the development of composite material technology, due to the poor quality stability of wet prepreg and the difficulty in meeting the requirements of environmental protection, the process of preparing prepreg by wet method has been gradually replaced by the preparation of prepreg by melting method. However, the vast majority of resins on the market still contain a large amount of solvent. To prepare resin prepregs by hot melt method, the first problem to be solved is to reduce the content of volatile matter in the resin. At present, the method of reducing the volatile content of resin is to pour the resin into an iron pan and put it in a vacuum oven to remove the solvent. At present, this method has the following problems:

1) The solvent removal efficiency is low. The method of vacuuming can quickly remove the solvent in the resin in the early stage, but as the solvent content of the surface resin decreases, the viscosity of the system increases, and the resin crust on the surface prevents the bottom solvent from volatilizing, resulting in a sharp drop in the solvent removal efficiency;

2) Affect the subsequent use of resin. In order to speed up the volatilization of the solvent, the oven temperature is set at about 60 ℃ when vacuuming, and the general removal time is 16-24 hours to meet the requirements of preparing resin prepregs by hot-melt method, but long-term high temperature treatment makes the resin curing degree Increase slowly, affecting the curing properties of the resin.

SUMMARY OF THE INVENTION

The following presents a brief summary of the present invention in order to provide a basic understanding of certain aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or essential parts of the invention nor to limit the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a method for reducing the volatile content in the resin. The method provided by the present invention is simple and feasible, and the removal efficiency of the volatile content is high, and the obtained resin does not affect subsequent use. Some technical problems exist in the method of removing volatile content of resin.

The technical solution of the present invention is to provide a method for reducing volatile matter content in resin, the method comprising the following steps:

Step 1. Set up a multi-roller assembly, and the multi-roller assembly includes at least two pressing rollers;

Step 2, placing the resin between any group of adjacent pressing rollers of the multi-roller assembly, and controlling the plurality of pressing rollers of the multi-roller assembly to roll, wherein the temperature of any pressing roller is lower than the curing temperature of the resin;

Step 3. Measure the volatile content in the resin between the adjacent pressing rollers according to the set time, and adjust the volatile content between the adjacent pressing rollers according to the volatile content before the volatile content meets the requirements for use. distance, wherein the volatile content is negatively correlated with the distance.

Further, the step 1 further includes setting a ventilation device, and the ventilation device is used to ventilate the resin.

Further, the temperature of any of the pressing rollers is 30°C+ΔT, wherein ΔT≤20.

Further, the multi-roller assembly includes two pressing rollers.

Further, the multi-roller assembly includes three pressing rollers.

Further, the multi-roll assembly including three pressure rollers is a three-pressure roller mill.

Further, the set time is 10-30min.

Further, the resin is a phenolic resin.

Further, when the volatile content of the resin is 30-40%, the distance between the adjacent pressing rollers is 0.1-0.5 mm; when the volatile content of the resin is 20-30%, the distance between the adjacent pressing rollers is 0.1-0.5 mm. The spacing is 0.5-2.5 mm; when the volatile content of the resin is 5-20%, the spacing between the adjacent pressing rollers is 2.5-5.0 mm.

Further, in described step 3, the measuring method of volatile matter content in described resin is:

Take out a certain amount of resin, spread it on the measuring paper, and measure the mass as m1;

Put the resin and weighing paper into the oven, and after heating for a certain time according to the set temperature, measure the mass as m2;

The content of volatile matter in the resin is ((m1-m2)/m1)%.

Applying the above technical solution, a method for reducing the volatile content of resin at a low temperature is provided. A multi-roller assembly comprising at least two pressing rollers is used, and the high-speed rotating pressing rollers are used to make the resin continuously squeezed between the pressing rollers and continuously in the resin. A continuous resin film is formed on the pressure roller, and the distance between the adjacent pressure rollers is continuously adjusted according to the volatile content to ensure the removal efficiency. The above method enables the resin to obtain the same probability of contacting the air, and the volatile content of the resin can be simultaneously reduced. and high efficiency. In addition, due to the low temperature setting of the rollers and the short treatment time, there is little impact on the resin post-curing properties. In conclusion, the preparation method of the present invention is simple to operate, has little impact on the subsequent use of the resin, is economical and environmentally friendly, has high volatile content removal efficiency (the volatile content is reduced to less than 10%), and has wide application fields.

Description of drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention, constitute a part of the specification, are used to illustrate the embodiments of the invention, and together with the description, serve to explain the principles of the invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of removing resin volatile content by a multi-roll assembly using two pressing rollers according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of removing the volatile content of resin by a multi-roll assembly using three pressing rollers according to an embodiment of the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to assist in a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.

It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show the device structure and/or processing steps closely related to the solution according to the present invention, and omit the details related to the present invention. Invent other details that are less relevant.

As involved in the background art, the existing method for removing the volatile content in the resin is to pour it into an iron pan and put it in a vacuum oven to remove it by vacuuming. The method is that the solvent removal efficiency is low; use. Based on this background, the embodiment of the present invention provides a method for reducing the volatile content of resin. The method provided by the present invention is simple and feasible, and the removal efficiency of volatile content is high, the obtained resin does not affect subsequent use, and solves the problem of existing resin volatiles The technical problems existing in the method of content removal. A method for reducing the volatile content of resin provided by the embodiment of the present invention comprises the following steps:

Step 1. Set up a multi-roller assembly, and the multi-roller assembly includes at least two pressing rollers;

Step 2, placing the resin between any group of adjacent pressing rollers of the multi-roller assembly, and controlling the plurality of pressing rollers of the multi-roller assembly to roll, wherein the temperature of any pressing roller is lower than the curing temperature of the resin;

Step 3. Measure the volatile content in the resin between the adjacent pressing rollers according to the set time, and adjust the volatile content between the adjacent pressing rollers according to the volatile content before the volatile content meets the requirements for use. distance, wherein the volatile content is negatively correlated with the distance.

In the embodiment of the present invention, the resin may be a phenolic resin.

In the embodiment of the present invention, the multiple pressure rollers included in the multi-roller assembly are multiple pressure rollers arranged horizontally, and each pressure roller should be on the same horizontal plane, that is, the highest point cutting plane of the pressure rollers is the same horizontal plane.

In the embodiment of the present invention, as shown in Figures 1-2, the rolling directions of any adjacent pressure rollers are opposite to each other, for example, one of the pressure rollers rolls counterclockwise, and the adjacent pressure rollers are set to roll clockwise. In addition, the specific means for the control of the pressing roller may adopt the technology known in the art, which will not be described in detail here.

In the embodiment of the present invention, the resin placed between adjacent pressing rolls should not exceed the highest point of any pressing roll.

In the embodiment of the present invention, the adjacent pressing rollers of the multi-roller assembly are two pressing rollers that move towards each other, as shown in the figure, the first roller and the second roller, or the second roller and the third roller, in addition, Unless otherwise specified, the adjacent pressing rollers in the embodiments of the present invention refer to a group of adjacent pressing rollers on which the resin is placed as described in step 2.

In the embodiment of the present invention, the initial spacing between all adjacent pressing rollers can be determined according to the initial content of resin volatiles. For example, for phenolic resin, the initial volatile content of the resin is 30-40%. The spacing is 0.1 to 0.5 mm.

The embodiment of the present invention provides a method for reducing the volatile content of resin at a low temperature. A multi-roller assembly including at least two pressing rollers is adopted, and the high-speed rotating pressing rollers are used to make the resin continuously squeezed between the pressing rollers and continuously A continuous resin film is formed on the pressure roll (it should be noted that during the method, the resin is not all adhered to the pressure roll, and the resin will be partially squeezed off the pressure roll when entering a small gap, thereby forming a dynamic resin film), so that the resin has the same probability of contacting the air, the volatile content of the resin can be simultaneously reduced and the efficiency is high, and according to the volatile content, by continuously adjusting the distance between the adjacent pressing rollers, it is ensured that the resin is retained until, for example, the first On the premise of the gap between the roller and the second roller, increase the thickness of the resin film on the surface of the pressure roller as much as possible, increase the time for the resin to form a film on the roller, and then ensure the removal efficiency. In addition, due to the low temperature setting of the rollers, there is little effect on the post-curing properties of the resin.

As an embodiment of the present invention, in order to further improve the removal efficiency of volatile matter in the resin, the step 1 further includes setting a ventilation device, and the ventilation device is used to ventilate the resin. Through this design method, by increasing the contact area between resin and air, and ensuring that the resin has the same probability of contacting air, the removal efficiency of volatiles is ensured under the condition of ventilation and heating.

As an embodiment of the present invention, in order to ensure the removal efficiency of volatile matter and not affect the subsequent use of the resin, the temperature of any of the pressing rollers is 30°C+ΔT, where ΔT≤20. It can be seen that the method of the embodiment of the present invention can complete the removal of the volatile matter in the resin at low temperature, which ensures the subsequent use effect of the resin.

As a specific example, for the phenolic resin, the temperature of the pressing roller can be set to 30°C to 50°C.

As an embodiment of the present invention, the above-mentioned multi-roller assembly includes no more than three pressing rollers. One of. Too many pressing rollers lead to an increase in cost. Second, the resin is basically extruded and formed into a film on the above-mentioned adjacent pressing rollers, and the resin content on the subsequent pressing rollers is not much (in the corresponding method, it is only necessary to adjust the above-mentioned adjacent pressing rollers). The spacing of the pressing rollers is sufficient). Taking two factors into consideration, it is preferable to set no more than three pressing rollers.

As a specific embodiment, as shown in FIG. 1 , the multi-roller assembly includes two pressing rollers.

As a specific embodiment, as shown in FIG. 2 , the multi-roller assembly includes three pressing rollers.

More specifically, the multi-roll assembly including three pressure rollers can be a three-roll mill, and the three-roll mill is an existing device, as shown in FIG. The method of the invention embodiment is illustrated by an example:

1: Start the three-roll mill, control the gap between the front roller (the first roller, the same below) and the second roller at the initial distance, the scraper leaves the roller surface of the rear roller (third roller), and slowly pour a certain amount of phenolic phenolic resin onto the three rollers. Between the front roller and the second roller of the roller mill, the amount of phenolic resin should cover the gap and be flush with the highest point of the front roller;

2: Test the volatile content of the resin every set time, and adjust the roller spacing according to the volatile content; among them, the phenolic resin is continuously rolled on the three-roll mill, and the roller temperature is controlled at 30-50 ° C, and the three-roll mill is used to grind the resulting The heat volatilizes the phenolic resin, and at the same time, the ventilation equipment is activated to speed up the air flow;

3: After the volatile content of the phenolic resin meets the requirements, the scraper is attached to the rear roller, and the phenolic resin is scraped off the three-roller mill and flows into the collecting device.

As an embodiment of the present invention, the set time may be 10-30 min, or 20-30 min.

As an embodiment of the present invention, in order to improve the removal efficiency of volatile matter in the resin, the volatile matter content in the resin and the distance between adjacent pressing rollers can be set to have the following relationship: when the volatile matter content of the resin is 30-40%, The distance between the adjacent pressing rollers is 0.1-0.5 mm; when the volatile content of the resin is 20-30%, the distance between the adjacent pressing rollers is 0.5-2.5 mm; the volatile content of the resin is 5-2.5 mm. At 20%, the distance between the adjacent pressing rollers is 2.5-5.0 mm. Through this configuration, under the specific relationship between the above-mentioned volatile content and the distance between adjacent pressing rollers, the removal efficiency of the volatile content can be ensured to be optimal.

As an embodiment of the present invention, in order to accurately obtain the content of the volatile matter of the resin in step 3, in the step 3, the measurement method of the volatile matter content in the resin may be:

Take out a certain amount of resin, spread it on the measuring paper, and measure the mass as m1;

Put the resin and weighing paper into the oven, and after heating for a certain time according to the set temperature, measure the mass as m2;

The content of volatile matter in the resin is ((m1-m2)/m1)%.

To sum up, the method of the embodiment of the present invention utilizes high-speed rotating pressure rollers to continuously squeeze the resin between the pressure rollers, the rolling of the pressure rollers forms a continuous resin film on the surface, and adjusts the distance between the rollers according to the volatile content of the resin, and Under the combined effect of the roller at the bottom of the resin film and the air flow above, after a certain period of time, the volatile content in the phenolic resin can be reduced from 40% to less than 10% at a lower temperature. The method does not require a special solvent removal device, is suitable for rough solvent removal, and has the advantages of low temperature, high efficiency, and little effect on the subsequent curing performance of the phenolic resin. It can be widely used in defense industry, military, aerospace and construction and other fields.

The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of the claimed protection of the present invention.

The following examples take phenolic resin as an example, and the multi-roll assembly is set to include three pressing rolls, and specifically, a three-roll mill can be used.

Example 1

Step 1: Start the three-roll mill, the gap between the front roller and the second roller is controlled at 0.1mm, the scraper leaves the surface of the rear roller, and a certain amount of phenolic phenolic resin is slowly poured into the middle of the front roller and the second roller of the three-roller mill. The amount of resin is to cover the gap and be flush with the highest point of the front roller;

Step 2: Test the volatile content of the resin every 30 minutes, and adjust the roller spacing according to the volatile content. The test method for the volatile content in the phenolic resin is to take out 10-20 g of the phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature to 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2)/m1%. When the resin volatile content is 30-40%, the roller spacing is 0.1mm; when the resin volatile content is 20-30%, the roller spacing is 0.5mm; when the resin volatile content is 10-20%, the roller spacing is 2.5mm , in which the phenolic resin is continuously rolled on the three-roll mill, and the roller temperature is controlled at 30 ° C. The three-roll mill is used to grind to generate heat to volatilize the phenolic resin, and at the same time, the ventilation equipment is activated to speed up the air flow;

Step 3: After the volatile content of the phenolic resin meets the requirements, the scraper is attached to the rear roller, and the phenolic resin is scraped off the three-roller mill and flows into the collecting device.

Table 1 shows a comparison of the gel time of the phenolic resin in this embodiment, the treatment time of the resin volatile content from 40% to 10%, and the production efficiency.

Example 2

Step 1: Start the three-roll mill, the gap between the front roller and the second roller is controlled at 0.1mm, the scraper leaves the surface of the rear roller, and a certain amount of phenolic phenolic resin is slowly poured into the middle of the front roller and the second roller of the three-roller mill. The amount of resin is to cover the gap and be flush with the highest point of the front roller;

Step 2: Test the volatile content of the resin every 30 minutes, and adjust the roller spacing according to the volatile content. The test method for the volatile content in the phenolic resin is to take out 10-20 g of the phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature to 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2)/m1%. When the resin volatile content is 30-40%, the roller spacing is 0.1mm; when the resin volatile content is 20-30%, the roller spacing is 0.5mm; when the resin volatile content is 10-20%, the roller spacing is 2.5mm , in which the phenolic resin is continuously rolled on the three-roll mill, and the roller temperature is controlled at 40 ° C. The three-roll mill is used to grind to generate heat to volatilize the phenolic resin, and at the same time, the ventilation equipment is turned on to speed up the air flow;

Step 3: After the volatile content of the phenolic resin meets the requirements, the scraper is attached to the rear roller, and the phenolic resin is scraped off the three-roller mill and flows into the collecting device.

Table 1 shows a comparison of the gel time of the phenolic resin in this embodiment, the treatment time of the resin volatile content from 40% to 10%, and the production efficiency.

Example 3

Step 1: Start the three-roll mill, the gap between the front roller and the second roller is controlled at 0.1mm, the scraper leaves the surface of the rear roller, and a certain amount of phenolic phenolic resin is slowly poured into the middle of the front roller and the second roller of the three-roller mill. The amount of resin is to cover the gap and be flush with the highest point of the front roller;

Step 2: Test the volatile content of the resin every 30 minutes, and adjust the roller spacing according to the volatile content. The test method for the volatile content in the phenolic resin is to take out 10-20 g of the phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature to 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2)/m1%. When the resin volatile content is 30-40%, the roller spacing is 0.1mm; when the resin volatile content is 20-30%, the roller spacing is 0.5mm; when the resin volatile content is 10-20%, the roller spacing is 2.5mm , in which the phenolic resin is continuously rolled on the three-roll mill, and the roller temperature is controlled at 50 ° C. The three-roll mill is used to grind to generate heat to volatilize the phenolic resin, and at the same time, the ventilation equipment is activated to speed up the air flow;

Step 3: After the volatile content of the phenolic resin meets the requirements, the scraper is attached to the rear roller, and the phenolic resin is scraped off the three-roller mill and flows into the collecting device.

Table 1 shows a comparison of the gel time of the phenolic resin in this embodiment, the treatment time of the resin volatile content from 40% to 10%, and the production efficiency.

Example 4

Step 1: Start the three-roll mill, the gap between the front roller and the second roller is controlled at 0.5mm, the scraper leaves the surface of the rear roller, and a certain amount of phenolic phenolic resin is slowly poured into the middle of the front roller and the second roller of the three-roller mill. The amount of resin is to cover the gap and be flush with the highest point of the front roller;

Step 2: Test the volatile content of the resin every 30 minutes, and adjust the roller spacing according to the volatile content. The test method for the volatile content in the phenolic resin is to take out 10-20 g of the phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature to 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2)/m1%. When the resin volatile content is 30-40%, the roller spacing is 0.5mm; when the resin volatile content is 20-30%, the roller spacing is 2.5mm; when the resin volatile content is 10-20%, the roller spacing is 5.0mm , in which the phenolic resin is continuously rolled on the three-roll mill, and the roller temperature is controlled at 50 ° C. The three-roll mill is used to grind to generate heat to volatilize the phenolic resin, and at the same time, the ventilation equipment is activated to speed up the air flow;

Step 3: After the volatile content of the phenolic resin meets the requirements, the scraper is attached to the rear roller, and the phenolic resin is scraped off the three-roller mill and flows into the collecting device.

Table 1 shows a comparison of the gel time of the phenolic resin in this embodiment, the treatment time of the resin volatile content from 40% to 10%, and the production efficiency.

Comparative ratio

Put 2Kg of phenolic phenolic resin into a vacuum oven, set the temperature to 80°C, and take it out after 6 hours. The volatile content of the phenolic resin was measured to be 25%, the gel time at 120°C was 7min, and the production efficiency was 0.5kg/h.

Table 1 Test results of each embodiment

It can be seen from Table 1 that the higher the roll temperature and the larger the roll gap of the three-roll mill, the higher the removal efficiency of phenolic resin volatiles. The gel time of phenolic resin decreases after the roll temperature rises, but it has no effect on the use. The production efficiency in the table is the amount of phenolic resin that reduces the volatile content to 10% or less per unit time. When the roll diameter and length of the three-roll mill are constant, the production efficiency depends on the roll gap and roll temperature. The larger the roll gap and the higher the temperature, the higher the production efficiency.

As can be seen from Table 1 and the comparative example, the volatile content of the resin of the comparative example is higher after 6h treatment, the production efficiency is lower than that of the present invention, and the resin gel time is significantly shortened, indicating that the curing performance of the resin has been affected by the treatment process. , affecting the use of subsequent resins.

Features described and/or illustrated above for one embodiment may be used in the same or similar manner in one or more other embodiments, and/or in combination with or instead of features in other embodiments Features in use.

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps, components or combinations thereof .

The many features and advantages of these embodiments are apparent from this detailed description, and the appended claims are therefore intended to cover all such features and advantages of these embodiments as fall within their true spirit and scope. Furthermore, since many modifications and changes will readily occur to those skilled in the art, the embodiments of the present invention are not intended to be limited to the precise construction and operation illustrated and described, but are to cover all suitable modifications and equivalents falling within the scope thereof thing.

The parts of the present invention that are not described in detail are well known to those skilled in the art.

Claims (9)

1. a method for reducing volatile matter content in resin, is characterized in that, described method comprises the following steps: Step 1. Set up a multi-roller assembly, the multi-roller assembly includes at least two pressing rollers, and there is a gap between any adjacent pressing rollers; Step 2. The resin is placed between any group of adjacent pressing rollers of the multi-roll assembly, and the plurality of pressing rollers of the multi-roll assembly are controlled to roll, wherein the temperature of any pressing roller is lower than the curing temperature of the resin, and the resin is pressed A continuous resin film is formed on the roller; Step 3. Measure the volatile content in the resin between the adjacent pressing rollers according to the set time, and adjust the volatile content between the adjacent pressing rollers according to the volatile content before the volatile content reaches the usage requirements. spacing, wherein the volatile matter content is negatively correlated with the size of the spacing, and when the resin volatile matter content is 30-40%, the spacing between adjacent pressing rollers is 0.1-0.5 mm; the resin volatile matter content is 0.1-0.5 mm; When the content is 20-30%, the distance between the adjacent pressing rollers is 0.5-2.5 mm; when the resin volatile content is 5-20%, the distance between the adjacent pressing rollers is 2.5-5.0 mm. 2 . The method for reducing volatile content in resin according to claim 1 , wherein the step 1 further comprises setting a ventilation device, and the ventilation device is used to ventilate the resin. 3 . 3 . The method for reducing volatile content in resin according to claim 1 , wherein, the temperature of any of the pressing rollers is 30° C.+ΔT, wherein ΔT≤20. 4 . 4 . The method for reducing the volatile content in resin according to claim 1 , wherein the multi-roller assembly comprises two pressing rollers. 5 . 5 . The method for reducing volatile content in resin according to claim 1 , wherein the multi-roller assembly comprises three pressing rollers. 6 . 6 . The method for reducing volatile content in resin according to claim 5 , wherein the multi-roll assembly comprising three pressing rollers is a three-rolling mill. 7 . 7 . The method for reducing volatile content in resin according to claim 1 , wherein the set time is 10-30 min. 8 . 8 . The method for reducing volatile content in resin according to claim 1 , wherein the resin is a phenolic resin. 9 . 9. a kind of method that reduces volatile matter content in resin according to claim 1, is characterized in that, in described step 3, the measuring method of volatile matter content in described resin is: Take out a certain amount of resin, spread it on the measuring paper, and measure the mass as m1; Put the resin and weighing paper into the oven, and after heating for a certain period of time according to the set temperature, measure the mass as m2; The content of volatile matter in the resin is ((m1-m2)/m1)%.

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