POD and PBO blend fiber and preparation method thereof

Abstract

The invention relates to a POD and PBO blended fiber and a preparation method thereof, and the preparation method comprises the following steps: A, preparing a POD and PBO blended solution: firstly adding PPA into a reaction kettle, and then adding POD and PBO into the reaction kettle so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with the solid content of 2-10%; b, defoaming: conveying the blended polymer solution prepared in the previous step into a stirring kettle by using a booster pump; c, filtering: conveying the defoamed blended polymer solution into a filter by using a booster pump, and filtering; d, spinning: introducing the filtered blended polymer solution into a metering pump for accurate metering, then conveying the blended polymer solution into a spinning assembly by using a booster pump, and then entering a coagulating bath at the temperature of 0-10 DEG C to form nascent fibers; e, drafting, neutralizing and washing; f, drying: drying the wet fibers at the temperature of 150 DEG C to obtain the POD and PBO blend fibers, so that the prepared blend fibers have higher heat resistance and high strength.

Description

[Technical field]

[0001] The invention relates to the technical field of POD fibers, and in particular to a blended fiber of POD and PBO and a preparation method thereof. [Background technology]

[0002] Polyaromatic oxadiazole (POD) is the full name of aromatic poly-1,3,4-oxadiazole, which is a polymer material with good dimensional stability and excellent high temperature resistance. Polyaromatic oxadiazole fiber, also known as POD fiber, refers to a special fiber with a main chain containing benzene ring and oxadiazole ring. Polyaromatic oxadiazole fiber has the advantages of good flame retardancy, wear resistance, corrosion resistance, etc., and is widely used in papermaking, environmental dust removal, protective products, military and other fields.

[0003] PBO fiber is poly-p-phenylene benzobisoxazole fiber, a high-performance organic synthetic fiber, belonging to aromatic heterocyclic polymers. It is currently the best high-performance organic fiber with the best mechanical properties. Its strength reaches 5.8Gpa, and its tensile modulus reaches 280Gpa, which is the highest among organic fibers and higher than aramid III fiber. It has good heat resistance, and its thermal decomposition temperature reaches 650℃, the highest among organic fibers. It can still maintain good mechanical properties at high temperatures, and its operating temperature range can reach about 300℃. In addition, it also has excellent acid and alkali corrosion resistance, flame retardancy and good wave transmission performance.

[0004] Since POD fiber has low price and PBO fiber has high price, but PBO fiber has heat resistance and high strength that POD fiber does not have, we are thinking about how to provide a manufacturing method to make these two polymer materials, POD and PBO, into a blended fiber, so that the manufactured blended fiber has a price advantage while also having good heat resistance and high strength.

[0005] The present invention aims to provide such a blended fiber of POD and PBO and a preparation method thereof. [Summary of the invention]

[0006] In order to solve the above problems, the object of the present invention is to provide a blended fiber of POD and PBO with good heat resistance and high strength and a preparation method thereof.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a method for preparing a blended fiber of POD and PBO, comprising the following steps: A, preparing a blended solution of POD and PBO: first, adding PPA into a reactor, then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content between 2% and 10%, the mass percentage of POD and PBO is 98:2 or 96:4 or 94:6 or 92:8 or 90:10, and the total mass of POD and PBO added together with the mass percentage of PPA is between 2:98 and 10:90; B, degassing: using a booster pump to transport the blended polymer solution obtained in the above steps to a stirring kettle, and then evacuating the stirring kettle to a pressure below 50 Pa, the polymer blend solution is degassed while being stirred; C, filtration: the degassed polymer blend solution is conveyed to a filter by a booster pump for filtration, and the filtration accuracy is 50 microns; D, spinning: the filtered polymer blend solution is passed into a metering pump for precise metering, and then conveyed to a spinneret assembly by a booster pump, and ejected from a spinneret at the end of the spinneret assembly, and then enters a coagulation bath at a temperature of 0 to 10°C to form nascent fibers; E, drawing, neutralization, and washing: the nascent fibers are sequentially drawn by multiple groups of drawing rollers at different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F, drying: the wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0008] Preferably, the method for preparing a blended fiber of POD and PBO in the present invention is further configured as follows: in the above step B, the stirring tank is a stainless steel stirring tank.

[0009] Preferably, the method for preparing a blended fiber of POD and PBO in the present invention is further configured as follows: in the above step C, the filter element of the filter is a stainless steel metal sintered felt.

[0010] Preferably, the method for preparing a blended fiber of POD and PBO in the present invention is further configured as follows: in the above step D, the diameter of the spinneret hole is 0.15 mm.

[0011] Preferably, the method for preparing a blended fiber of POD and PBO in the present invention is further configured as follows: in the above step D, the coagulation bath contains phosphoric acid with a volume concentration of 40%.

[0012] The present invention also provides a blended fiber of POD and PBO prepared by the above preparation method.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention prepares a blended fiber from POD and PBO, so that the prepared blended fiber has high heat resistance and high strength. In addition, since the price of PBO in the market is much higher than that of POD, the present invention sets the mass percentage of POD to PBO to 98:2, 96:4, 94:6, 92:8 or 90:10 when preparing a blended solution of POD and PBO, thereby greatly reducing the cost while ensuring the performance of the subsequent blended fiber and realizing economic value. [Specific implementation method]

[0014] The preparation method of the blended fiber of POD and PBO according to the present invention is further described in detail below through specific examples.

[0015] Example 1

[0016] A method for preparing a blended fiber of POD and PBO comprises the following steps: A. preparing a blended solution of POD and PBO: first, adding PPA into a reactor, then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 10%, wherein the mass percentage of POD and PBO is 98:2, and the total mass of POD and PBO added together and the mass percentage of PPA are 10:90; B. degassing: conveying the blended polymer solution obtained in the above steps into a stirring kettle using a booster pump, in this embodiment, the stirring kettle is a stainless steel stirring kettle, and then the stirring kettle is evacuated to a pressure below 50 Pa, and the blended polymer solution is degassed while being stirred; C. filtering: conveying the degassed blended polymer solution into a filter using a booster pump for filtration, The filtration accuracy is 50 microns. In this embodiment, the filter element of the filter is a stainless steel metal sintered felt; D. Spinning: The filtered blended polymer solution is passed into a metering pump for precise metering and then transported to the spinneret assembly using a booster pump, and sprayed out from the spinneret at the end of the spinneret assembly. In this embodiment, the diameter of the spinneret hole is 0.15 mm, and then enters a coagulation bath at a temperature of 0°C to form nascent fibers, and the coagulation bath contains phosphoric acid with a volume concentration of 40%; E. Drawing, neutralization, and washing: The nascent fibers are sequentially drawn through multiple groups of drawing rollers with different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F. Drying: The wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0017] Example 2

[0018] A method for preparing a blended fiber of POD and PBO comprises the following steps: A. preparing a blended solution of POD and PBO: first, adding PPA into a reactor, and then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 8%, wherein the mass percentage of POD and PBO is 96:4, and the total mass of POD and PBO added together and the mass percentage of PPA are 8:92; B. degassing: conveying the blended polymer solution obtained in the above steps to a stirring kettle using a booster pump. In the present embodiment, the stirring kettle is a stainless steel stirring kettle, and then the stirring kettle is evacuated to a pressure below 50 Pa, and the blended polymer solution is degassed while being stirred; C. filtering: conveying the degassed blended polymer solution to a filter using a booster pump for filtration. The filtration accuracy is 50 microns. In this embodiment, the filter element of the filter is a stainless steel metal sintered felt; D. Spinning: The filtered blended polymer solution is passed into a metering pump for precise metering and then transported to the spinneret assembly using a booster pump, and sprayed out from the spinneret at the end of the spinneret assembly. In this embodiment, the diameter of the spinneret hole is 0.15 mm, and then enters a coagulation bath at a temperature of 0°C to form nascent fibers, and the coagulation bath contains phosphoric acid with a volume concentration of 40%; E. Drawing, neutralization, and washing: The nascent fibers are sequentially drawn through multiple groups of drawing rollers with different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F. Drying: The wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0019] Example 3

[0020] A method for preparing a blended fiber of POD and PBO comprises the following steps: A. preparing a blended solution of POD and PBO: first, adding PPA into a reactor, and then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 6%, wherein the mass percentage of POD and PBO is 94:6, and the total mass of POD and PBO added together and the mass percentage of PPA are 6:94; B. degassing: conveying the blended polymer solution obtained in the above steps to a stirring kettle using a booster pump. In the present embodiment, the stirring kettle is a stainless steel stirring kettle, and then the stirring kettle is evacuated to a pressure below 50 Pa, and the blended polymer solution is degassed while being stirred; C. filtering: conveying the degassed blended polymer solution to a filter using a booster pump for filtration. The filtration accuracy is 50 microns. In this embodiment, the filter element of the filter is a stainless steel metal sintered felt; D. Spinning: The filtered blended polymer solution is passed into a metering pump for precise metering and then transported to the spinneret assembly using a booster pump, and sprayed out from the spinneret at the end of the spinneret assembly. In this embodiment, the diameter of the spinneret hole is 0.15 mm, and then enters a coagulation bath at a temperature of 0°C to form nascent fibers, and the coagulation bath contains phosphoric acid with a volume concentration of 40%; E. Drawing, neutralization, and washing: The nascent fibers are sequentially drawn through multiple groups of drawing rollers with different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F. Drying: The wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0021] Example 4

[0022] A method for preparing a blended fiber of POD and PBO comprises the following steps: A. preparing a blended solution of POD and PBO: first, adding PPA into a reactor, then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 4%, wherein the mass percentage of POD and PBO is 92:8, and the total mass of POD and PBO added together and the mass percentage of PPA are 4:96; B. degassing: conveying the blended polymer solution obtained in the above steps to a stirring kettle using a booster pump. In the present embodiment, the stirring kettle is a stainless steel stirring kettle, and then the stirring kettle is evacuated to a pressure below 50 Pa, and the blended polymer solution is degassed while being stirred; C. filtering: conveying the degassed blended polymer solution to a filter using a booster pump for filtration. The filtration accuracy is 50 microns. In this embodiment, the filter element of the filter is a stainless steel metal sintered felt; D. Spinning: The filtered blended polymer solution is passed into a metering pump for precise metering and then transported to the spinneret assembly using a booster pump, and sprayed out from the spinneret at the end of the spinneret assembly. In this embodiment, the diameter of the spinneret hole is 0.15 mm, and then enters a coagulation bath at a temperature of 0°C to form nascent fibers, and the coagulation bath contains phosphoric acid with a volume concentration of 40%; E. Drawing, neutralization, and washing: The nascent fibers are sequentially drawn through multiple groups of drawing rollers with different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F. Drying: The wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0023] Example 5

[0024] A method for preparing a blended fiber of POD and PBO comprises the following steps: A. preparing a blended solution of POD and PBO: first, adding PPA into a reactor, then adding POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 2%, wherein the mass percentage of POD and PBO is 90:10, and the total mass of POD and PBO added together and the mass percentage of PPA are 2:98; B. degassing: conveying the blended polymer solution obtained in the above steps into a stirring kettle using a booster pump, in this embodiment, the stirring kettle is a stainless steel stirring kettle, and then the stirring kettle is evacuated to a pressure below 50 Pa, and the blended polymer solution is degassed while being stirred; C. filtering: conveying the degassed blended polymer solution into a filter using a booster pump for filtration, The filtration accuracy is 50 microns. In this embodiment, the filter element of the filter is a stainless steel metal sintered felt; D. Spinning: The filtered blended polymer solution is passed into a metering pump for precise metering and then transported to the spinneret assembly using a booster pump, and sprayed out from the spinneret at the end of the spinneret assembly. In this embodiment, the diameter of the spinneret hole is 0.15 mm, and then enters a coagulation bath at a temperature of 0°C to form nascent fibers, and the coagulation bath contains phosphoric acid with a volume concentration of 40%; E. Drawing, neutralization, and washing: The nascent fibers are sequentially drawn through multiple groups of drawing rollers with different running speeds, and then enter a sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers, and then clean water is used to remove the salt and excess sodium bicarbonate in the fibers; F. Drying: The wet fibers are dried at a temperature of 150°C to obtain a blended fiber of POD and PBO.

[0025] Comparative Example

[0026] The comparative example of the present invention is POD fiber. The following table shows the experimental data of the blended fiber of POD and PBO in the present invention and the POD fiber in the comparative example after heat treatment at 400°C. From the experimental data, we can know that the blended fiber of POD and PBO in the present invention has improved strength and heat resistance compared with the POD fiber in the prior art.

[0027]

[0028] In summary, the present invention makes the blended fiber with high heat resistance and high strength by making POD and PBO into a blended fiber. In addition, since the price of PBO in the market is much higher than that of POD, the present invention sets the mass percentage of POD and PBO to 98:2 or 96:4 or 94:6 or 92:8 or 90:10 when preparing the POD and PBO blended solution, thereby greatly reducing the cost while ensuring the performance of the subsequent blended fiber and realizing economic value.

[0029] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A method for preparing a blended fiber of POD and PBO, characterized in that: The steps include: A. Prepare a POD and PBO blend solution: first, add PPA into a reactor, then add POD and PBO into the reactor so that POD and PBO are dissolved in PPA to obtain a mixed polymer solution with a solid content of 2 to 10%, wherein the mass percentage of POD to PBO is 98:2 or 96:4 or 94:6 or 92:8 or 90:10, and the mass percentage of the total mass of POD and PBO to the mass percentage of PPA is between 2:98 and 10:90; B. Degassing: The polymer blend solution prepared in the above steps is transported to a stirring kettle using a booster pump, and then the stirring kettle is evacuated to a pressure lower than 50 Pa, and the polymer blend solution is degassed while being stirred; C. Filtration: The degassed polymer blend solution is transported to a filter using a booster pump for filtration with a filtration accuracy of 50 microns; D. Spinning: The filtered polymer blend solution is passed into a metering pump for precise metering, and then transported to the spinneret assembly using a booster pump, and ejected from the spinneret at the end of the spinneret assembly, and then enters a coagulation bath at a temperature of 0 to 10°C to form nascent fibers; E. Drafting, neutralization, and washing: The nascent fibers are sequentially drafted by multiple groups of drafting rollers at different running speeds, and then enter the sodium bicarbonate solution to neutralize the phosphoric acid inside the fibers. Clean water is then used to remove the salt and excess sodium bicarbonate in the fibers. F. Drying: Dry the wet fiber at 150°C to obtain the blended fiber of POD and PBO.

2. The method for preparing a blended fiber of POD and PBO according to claim 1, characterized in that: In the above step B, the stirring tank is a stainless steel stirring tank.

3. The method for preparing a blended fiber of POD and PBO according to claim 1, characterized in that: In the above step C, the filter element of the filter is stainless steel metal sintered felt.

4. The method for preparing a blended fiber of POD and PBO according to claim 1, characterized in that: In the above step D, the diameter of the spinneret hole is 0.15 mm.

5. The method for preparing a blended fiber of POD and PBO according to claim 1, characterized in that: In the above step D, the coagulation bath contains phosphoric acid with a volume concentration of 40%.

6. A blended fiber of POD and PBO obtained by the preparation method as described in any one of claims 1 to 5.

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