Method for preparing electronic grade insulating paste from bamboo

Abstract

The application discloses a method for preparing electronic-grade insulating pulp from bamboo, and relates to the technical field of insulating pulp production and preparation, and comprises the following preparation steps: step A, collecting bamboo raw materials in Hunan area; step B, flaking operation, bamboo is flaked and cut into pieces in a bamboo processing factory; step C, water washing operation, bamboo pieces are washed to balance water content; step D, cooking operation, bamboo pieces are cooked by adopting sulfite process, and the yield of the crude pulp is controlled to be 40-50%; step E, screening operation; step F, beating operation; step G, sheeting operation and strength detection. The method for preparing electronic-grade insulating pulp from bamboo has certain regionalism by adopting locally planted bamboo in Hunan, the prepared electronic-grade insulating pulp reaches the superior standard, and the prepared electronic-grade insulating pulp has the quality index that the conductivity is less than 3 us / cm by adopting deionized water for washing in the whole process.

Description

A method for preparing electronic-grade insulating paste using moso bamboo Technical Field

[0001] This invention relates to the field of insulating slurry production and preparation technology, specifically a method for preparing electronic-grade insulating slurry using moso bamboo. Background Technology

[0002] Due to the unstable source and quality of wood chip raw materials and insufficient investment in enterprise research and development, the existing wood pulp production is difficult to consistently meet the quality requirements of insulating pulp, resulting in problems of "not being easy to use and not daring to use". At present, there is a large demand for electronic-grade insulating bamboo pulp preparation and production, and the insulating wood pulp needed in China is basically imported from foreign countries, indicating a broad market development prospect.

[0003] my country has abundant bamboo resources, and the production cycle of moso bamboo is short. Therefore, bamboo-based electronic-grade insulating grout has become an important component in ensuring the supply of high-end insulation materials in China. How to utilize moso bamboo to produce electronic-grade insulating grout on a large scale is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a method for preparing electronic-grade insulating slurry using moso bamboo. Moso bamboo, grown locally in Hunan Province, has been widely used in various fields in recent years due to its excellent physical and chemical properties. In the electronics field, the demand for insulating materials is increasing, and moso bamboo, as a renewable resource, has the potential to prepare electronic-grade insulating slurry. Due to differences in the growing regions, bamboo varies in its composition, including bamboo fiber, impurities, ash, and metal ions. Our company has independently developed a method for preparing electronic-grade insulating slurry using moso bamboo grown locally in Hunan Province as raw material. The prepared electronic-grade insulating slurry meets superior standards, and the entire process uses deionized water for washing. The conductivity of the prepared electronic-grade insulating slurry is less than 3 μS / cm.

[0005] Deionized water is treated with anion and cation exchange beds and reverse osmosis membranes, resulting in water that is essentially free of anions and cations and has a neutral pH. Using deionized water for washing prevents the introduction of impurities (anions and cations) that could affect the performance of the insulating slurry. Neutral water washing also makes it easier to remove anion and cation polymers from the slurry. Washing with deionized water stabilizes and improves the quality and performance of the slurry during the treatment process.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing electronic-grade insulating paste using moso bamboo includes the following preparation steps:

[0008] Step A: Harvesting moso bamboo raw materials in Hunan Province;

[0009] Step B: Slicing operation, the bamboo processing plant performs the slicing and splitting of moso bamboo;

[0010] Step C: Washing process. Wash the bamboo strips with water to ensure even moisture distribution.

[0011] Step D: Cooking operation, using the sulfate method to cook bamboo strips, with the crude pulp yield controlled at 40-50%;

[0012] Step E: Slurry screening operation;

[0013] Step F: Pulping operation;

[0014] Step G: Copying and strength testing.

[0015] As a further improvement to the above scheme, in step D, the treated bamboo chips, water, NaOH solution, and Na2S liquid are mixed and cooked. The bamboo chips account for 20% of the weight of the mixture, and the water, NaOH, and Na2S liquid account for 80% of the weight of the mixture. The alkali used is 25%, the heating time is 26 minutes, the maximum cooking temperature is 155°C, the holding time is 80 minutes, and the cooling time is 25 minutes.

[0016] As a further improvement to the above scheme, in step E, the pulp screening operation uses a 0.15mm slit screen, and the collection is done using a mesh bag with a mesh size of not less than 300 mesh.

[0017] As a further improvement to the above scheme, the entire preparation process uses deionized water for washing, and the conductivity of the prepared electronic-grade insulating paste is less than 3 μS / cm.

[0018] As a further improvement to the above scheme, in step F, the pulp beating degree is controlled to be 38-45SR.

[0019] As a further improvement to the above scheme, in step G, the tensile strength of the product is controlled at 75-83 N·m / g, and the bursting strength is controlled at 5.5-7.0 kPa. 2 / g.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] Using locally grown moso bamboo from Hunan Province, this method has a certain regional specificity. Moso bamboo, with its excellent physical and chemical properties, has been widely used in various fields in recent years. In the electronics industry, the demand for insulating materials is increasing, and moso bamboo, as a renewable resource, has the potential to produce electronic-grade insulating slurry. Due to differences in the growing regions, bamboo varies in its composition, including bamboo fiber, impurities, ash, and metal ions. Our company has adapted to local conditions and independently developed a method for preparing electronic-grade insulating slurry using locally grown moso bamboo from Hunan Province as raw material. The resulting electronic-grade insulating slurry meets superior standards, and the entire process uses deionized water for washing. The conductivity of the prepared electronic-grade insulating slurry is less than 3 μS / cm.

[0022] Deionized water is treated with anion and cation exchange beds and reverse osmosis membranes, resulting in water that is essentially free of anions and cations and has a neutral pH. Using deionized water for washing prevents the introduction of impurities (anions and cations) that could affect the performance of the insulating slurry. Neutral water washing also makes it easier to remove anion and cation polymers from the slurry. Washing with deionized water stabilizes and improves the quality and performance of the slurry during the treatment process. Attached Figure Description

[0023] Figure 1 is a schematic flowchart of the method of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0025] As shown in Figure 1, the specific solution of this embodiment is: a method for preparing electronic-grade insulating paste using moso bamboo, comprising the following preparation steps:

[0026] Step A: Harvesting moso bamboo raw materials in Hunan Province;

[0027] Step B: Slicing operation, the bamboo processing plant performs the slicing and splitting of moso bamboo;

[0028] Step C: Washing process. Wash the bamboo strips with water to ensure even moisture distribution.

[0029] Step D: Cooking operation, using the sulfate process to cook bamboo strips, with the crude pulp yield controlled at 40-50%; Step E: Sieving operation;

[0030] Step F: Pulping operation;

[0031] Step G: Copying and strength testing.

[0032] As shown in Figure 1, in a preferred embodiment of the above method, in step D, the treated bamboo chips, water, NaOH solution, and Na2S liquid are mixed and cooked. The bamboo chips account for 20% of the weight of the mixture, and the water, NaOH, and Na2S liquid account for 80% of the weight of the mixture. The alkali used is 25%, the heating time is 26 minutes, the maximum cooking temperature is 155°C, the holding time is 80 minutes, and the cooling time is 25 minutes.

[0033] As shown in Figure 1, in the preferred embodiment above, in step E, the pulp screening operation uses a 0.15mm slit screen and the collection is done using a mesh bag with a mesh size of not less than 300 mesh.

[0034] As shown in Figure 1, in the preferred embodiment above, the entire preparation process uses deionized water for washing, and the conductivity of the prepared electronic-grade insulating paste is less than 3 μS / cm.

[0035] As shown in Figure 1, in the preferred embodiment above, in step F, the pulp beating degree is controlled to be 38-45SR.

[0036] As shown in Figure 1, in a preferred embodiment of the above method, in step G, the tensile strength of the product is controlled at 75-83 N·m / g, and the bursting strength is controlled at 5.5-7.0 kPa. 2 / g.

[0037] More specifically:

[0038] The analysis data of moso bamboo from different regions are shown in the table below:

[0039]

[0040] The 500kV transformer inter-turn insulation paper product produced in this application is made of high-quality sulfate pulp and is used for inter-turn insulation of transformers, reactors and other equipment with a rated voltage not exceeding 500kV.

[0041] The final product manufactured under this application is roll paper with a roll width of 625±5mm and a roll diameter of 550-650mm, or as specified in the order contract.

[0042] The quality indicators of the insulating grout developed using moso bamboo in this application are shown in the table below:

[0043]

[0044] The quality indicators of the final product manufactured under this application are shown in the table below:

[0045]

[0046] Compared with the prior art, this application:

[0047] Using locally grown moso bamboo from Hunan Province, this method has a certain regional specificity. Moso bamboo, with its excellent physical and chemical properties, has been widely used in various fields in recent years. In the electronics industry, the demand for insulating materials is increasing, and moso bamboo, as a renewable resource, has the potential to produce electronic-grade insulating slurry. Due to differences in the growing regions, bamboo varies in its composition, including bamboo fiber, impurities, ash, and metal ions. Our company has adapted to local conditions and independently developed a method for preparing electronic-grade insulating slurry using locally grown moso bamboo from Hunan Province as raw material. The resulting electronic-grade insulating slurry meets superior standards, and the entire process uses deionized water for washing. The conductivity of the prepared electronic-grade insulating slurry is less than 3 μS / cm.

[0048] Deionized water is treated with anion and cation exchange beds and reverse osmosis membranes, resulting in water that is essentially free of anions and cations and has a neutral pH. Using deionized water for washing prevents the introduction of impurities (anions and cations) that could affect the performance of the insulating slurry. Neutral water washing also makes it easier to remove anion and cation polymers from the slurry. Washing with deionized water stabilizes and improves the quality and performance of the slurry during the treatment process.

[0049] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the technical solutions of this invention. The above examples are merely to help understand the method and core ideas of this invention. The above are only preferred embodiments of this invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this invention.

Claims

1. A method for preparing electronic-grade insulating paste using moso bamboo, characterized in that, The preparation process includes the following steps: Step A: Harvesting bamboo raw materials from Hunan province; Step B: Slicing operation, the bamboo processing plant slices and cuts the bamboo into strips; Step C: Washing operation, the bamboo slices are washed to ensure even moisture content; Step D: Cooking operation, the bamboo slices are cooked using the sulfate method, the crude pulp yield is controlled at 40-50%, the treated bamboo slices, water, NaOH solution, and Na2S liquid are mixed and cooked, the bamboo slices account for 20% of the mixture by weight, the water, NaOH, and Na2S liquid account for 80% of the mixture by weight, 25% alkali is used, the heating time is 26 minutes, the maximum cooking temperature is 155℃, the holding time is 80 minutes, and the cooling time is 25 minutes; Step E: Sieving operation; Step F: Pulping operation; Step G: Sheet forming operation and strength testing, the tensile strength of the product is controlled at 75-83 N.m / g, and the bursting strength is controlled at 5.5-7.0 kPa. 2 In the preparation steps described above, deionized water is used for washing throughout the process, and the conductivity of the prepared electronic-grade insulating paste is less than 3 μS / cm.

2. The method for preparing electronic-grade insulating paste using moso bamboo according to claim 1, characterized in that, In step E, the pulp screening operation uses a 0.15mm slit screen, and the collection is done using a mesh bag with a mesh size of not less than 300 mesh.

3. The method for preparing electronic-grade insulating paste using moso bamboo according to claim 1, characterized in that, In step F, the pulp beating degree is controlled to be 38-45°SR.

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