Mixing and stirring process for pulping in glass fiber partition board production

Abstract

The invention discloses a mixing and stirring process for pulping in glass fiber partition production, and relates to the technical field of glass fiber partition production, the mixing and stirring process comprises the following specific steps: step 1, raw material pretreatment and preparation; 2, checking and debugging stirring equipment; step 3, adding water and primarily heating; step 4, adding a dispersing agent; 5, adding a glass fiber raw material; sixthly, fiber dispersion strengthening stirring is conducted; step 7, adding a binder and a defoaming agent; 8, finely mixing and stirring; and 9, closing a heating device of the stirring tank, and starting a cooling system. According to the mixing and stirring process for pulping in the production of the glass fiber partition plate, accurate stirring speed and time parameters are set in different stages, so that a dispersing agent is ensured to be fully dissolved; when glass fiber raw materials are added, a batch adding mode is adopted, fiber accumulation is prevented, the stirring process is accurately controlled, the uniformity and stability of slurry can be far better than those of a common process, and the quality of glass fiber partition plate products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber separator production, in particular to a mixing and stirring process for pulping glass fiber separator production. Background Art

[0002] Glass fiber is an inorganic non-metallic material with excellent performance. It is made of six kinds of minerals, namely pyrophyllite, quartz sand, limestone, dolomite, colemanite and magnesia stone, through high-temperature melting, drawing, winding and weaving. It is often used as a reinforcing material in composite materials, electrical insulation materials and thermal insulation materials.

[0003] At present, there are still the following deficiencies in the production process of glass fiber separators:

[0004] (1) The conventional process is often rough in the treatment of glass fiber raw materials, and the fibers are not fully opened, which makes it difficult to disperse the fibers evenly during the pulping process and easily causes fiber agglomeration, thereby affecting the strength and uniformity of the glass fiber separator;

[0005] (2) In ordinary processes, the inspection and maintenance of mixing equipment before and after use are often neglected or not performed properly. Problems such as residual impurities inside the equipment and component wear can easily lead to equipment failure, affect production continuity, and may contaminate the slurry;

[0006] (3) During the stirring process, the stirring speed and time settings of the general process flow are relatively arbitrary, lacking in specificity and precision, and cannot be flexibly adjusted according to the characteristics of the raw materials and the requirements of the pulping stage. This can easily lead to insufficient fiber dispersion or excessive stirring that damages the fibers, affecting the pulp quality. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a mixing and stirring process for pulping glass fiber separators, which solves the problems raised in the above-mentioned background technology.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A mixing and stirring process for producing glass fiber separator pulping, comprising the following specific steps:

[0009] Step 1: Raw material pretreatment and preparation, as follows:

[0010] (1) The glass fiber raw yarn is opened by a special opening device to disperse the fiber bundle into a single filament state. The opening degree must reach more than 95% to avoid fiber agglomeration in subsequent pulping;

[0011] (2) Accurately weigh the dispersant and binder according to the formula requirements, and control the weighing error within ±0.5%;

[0012] (3) Prepare deionized water that meets production requirements to ensure pulping quality;

[0013] Step 2: Check and debug the mixing equipment, as follows:

[0014] (1) Use a high-pressure water gun and special cleaning agent to thoroughly clean the mixing tank, mixing paddle, and pipes to ensure that there are no residual impurities; after cleaning, wipe the surface of the equipment with a clean rag;

[0015] (2) Check whether the agitator is firmly installed and whether the blades are deformed or worn; check the tightness of the belt of the transmission system to ensure that the belt does not slip; check the lubrication of the bearings and add grease in time;

[0016] Step 3: Add water and initially heat up, as follows:

[0017] (1) Inject the prepared deionized water into the mixing tank through the pipeline until the volume of the mixing tank is 60%-70%; control the water injection speed to avoid excessive water flow and the generation of a large amount of foam;

[0018] (2) Start the heating device of the stirring tank and slowly raise the water temperature to 35-40°C, with the heating rate controlled at 1-2°C / min; use a temperature sensor to monitor the water temperature in real time and adjust it through the control system;

[0019] Step 4: Add dispersant, as follows:

[0020] (1) Dispersant dissolution;

[0021] (2) Use a sampler to take 1-5 ml of the dispersion from the stirring tank and observe the dissolution of the dispersant under a microscope to ensure that there are no obvious particulate matter;

[0022] Step 5: Add glass fiber raw materials, as follows:

[0023] (1) Add the fiberized glass fiber raw material into the stirring tank in batches and gradually add it; the amount added each time should not exceed 20% of the remaining volume of the stirring tank, and the interval between each batch addition is 5-8 minutes;

[0024] (2) During the fiber addition process, gradually increase the stirring speed to 300-350 r / min to allow the fibers to disperse quickly in the water and avoid fiber accumulation on the water surface;

[0025] Step 6: Fiber dispersion and intensified stirring, as follows:

[0026] (1) Increase the stirring speed to 400-450 r / min and continue stirring for 20-30 min; through high-speed stirring, further disperse the fibers, fully separate the fibers, and form a uniform fiber suspension;

[0027] (2) Take samples from the stirring tank every 5 minutes to observe the dispersion state of the fibers;

[0028] Step 7: Add binder and defoamer, as follows:

[0029] (1) Order of adding additives: First, slowly add the weighed binder into the stirring tank and stir for 10-15 minutes to allow the binder to fully dissolve and mix evenly with the fiber; then add the defoamer and continue stirring for 5-8 minutes to eliminate the foam generated during the stirring process;

[0030] (2) Stirring speed control: During the process of adding additives, the stirring speed is maintained at 300-350 r / min to ensure that the additives can be evenly dispersed in the fiber suspension;

[0031] Step 8: Finely mix and stir, as follows:

[0032] (1) Reduce the stirring speed to 200-250 r / min and perform fine mixing for 15-20 min; low-speed stirring helps to evenly mix the various ingredients and reduce fiber damage;

[0033] (2) Slurry testing;

[0034] Step 9: Turn off the heating device of the stirring tank, turn on the cooling system, and reduce the slurry temperature to 25-30°C. The cooling rate is controlled at 1-2°C / min.

[0035] Step 10: Stop stirring and let the slurry stand in the stirring tank for 10-15 minutes to allow the bubbles in the slurry to fully escape and allow the fiber and additives to further stabilize the combination;

[0036] Step 11: Slurry quality re-inspection and transportation.

[0037] Optionally, in the step 1, the dispersant is polyethylene oxide, the binder is acrylate, and the mixing mass ratio between the dispersant and the binder is 1:6-10.

[0038] Optionally, the temperature of the deionized water in step 1 is set to 20-25° C., and the water conductivity is not higher than 5 μS / cm.

[0039] Optionally, the dissolution of the dispersant in step 4 is specifically as follows:

[0040] Slowly add the weighed dispersant into the stirring tank, turn on the agitator at the same time, and set the stirring speed to 150-200r / min; control the stirring time to 10-15min to allow the dispersant to fully dissolve in the water to form a uniform dispersion.

[0041] Optionally, if fiber agglomeration occurs in the dispersed state of the fibers in step 6, the stirring time may be prolonged or the amount of the dispersant may be increased.

[0042] Optionally, the slurry detection in step eight is specifically as follows:

[0043] Use a viscometer to measure the viscosity of the slurry, which is required to be controlled between 30-50 mPa·s;

[0044] Use a pH meter to test the pH of the slurry. The pH value should be controlled within the range of 6.5-7.5.

[0045] If the test results do not meet the requirements, the dosage of additives must be adjusted in time.

[0046] Optionally, the slurry quality re-inspection and transportation in step 11 are specifically as follows:

[0047] (1) Quality re-inspection: Re-test the viscosity and pH value of the slurry after standing, and observe the uniformity and stability of the slurry; if all indicators meet the requirements, the slurry is considered qualified; if not, adjustments are required;

[0048] (2) Slurry delivery: Turn on the slurry delivery pump and deliver the qualified slurry through the pipeline to the subsequent molding process; during the delivery process, control the delivery pressure at 0.3-0.5MPa to ensure smooth slurry delivery and no leakage.

[0049] The present invention provides a mixing and stirring process for producing glass fiber separator pulp, which has the following beneficial effects:

[0050] The mixing and stirring process for pulping of glass fiber separator production processes glass fiber raw yarn through special fiber opening equipment, strictly controls the fiber opening degree to more than 95%, and ensures the fiber dispersion effect from the source. Deionized water is used, and the water temperature is controlled at 20-25℃. The water conductivity is not higher than 5μS / cm, which provides a stable environmental basis for pulping and reduces the adverse effects of water quality problems on pulp quality. This process sets precise stirring speed and time parameters at different stages to ensure that the dispersant is fully dissolved. When adding glass fiber raw materials, batch addition is adopted to prevent fiber accumulation. In the fine mixing stage, the stirring speed is reduced to 200-250r / min to reduce fiber damage and fully mix the ingredients. This precise stirring process control can make the pulp uniformity and stability far better than ordinary processes, thereby improving the quality of glass fiber separator products. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] A mixing and stirring process for producing glass fiber separator pulping includes the following specific steps:

[0053] Step 1: Raw material pretreatment and preparation, as follows:

[0054] (1) The glass fiber raw yarn is opened by a special opening device to disperse the fiber bundle into a single filament state. The opening degree must reach more than 95% to avoid fiber agglomeration in subsequent pulping;

[0055] (2) Accurately weigh the dispersant and binder according to the formula requirements, and control the weighing error within ±0.5%;

[0056] The dispersant is polyethylene oxide, the binder is acrylate, and the mixing mass ratio between the dispersant and the binder is 1:6-10;

[0057] (3) Prepare deionized water that meets production requirements to ensure pulping quality. The deionized water temperature is set to 20-25°C, and the water conductivity is not higher than 5μS / cm;

[0058] Step 2: Check and debug the mixing equipment, as follows:

[0059] (1) Use a high-pressure water gun and special cleaning agent to thoroughly clean the mixing tank, mixing paddle, and pipes to ensure that there are no residual impurities; after cleaning, wipe the surface of the equipment with a clean rag;

[0060] (2) Check whether the agitator is firmly installed and whether the blades are deformed or worn; check the tightness of the belt of the transmission system to ensure that the belt does not slip; check the lubrication of the bearings and add grease in time;

[0061] Step 3: Add water and initially heat up, as follows:

[0062] (1) Inject the prepared deionized water into the mixing tank through the pipeline until the volume of the mixing tank is 60%-70%; control the water injection speed to avoid excessive water flow and the generation of a large amount of foam;

[0063] (2) Start the heating device of the stirring tank and slowly raise the water temperature to 35-40°C, with the heating rate controlled at 1-2°C / min; use a temperature sensor to monitor the water temperature in real time and adjust it through the control system;

[0064] Step 4: Add dispersant, as follows:

[0065] (1) Dispersant dissolution, specifically as follows:

[0066] Slowly add the weighed dispersant into the stirring tank, turn on the agitator at the same time, and set the stirring speed to 150-200r / min; control the stirring time to 10-15min to allow the dispersant to fully dissolve in the water to form a uniform dispersion;

[0067] (2) Use a sampler to take 1-5 ml of the dispersion from the stirring tank and observe the dissolution of the dispersant under a microscope to ensure that there are no obvious particulate matter;

[0068] Step 5: Add glass fiber raw materials, as follows:

[0069] (1) Add the fiberized glass fiber raw material into the stirring tank in batches and gradually add it; the amount added each time should not exceed 20% of the remaining volume of the stirring tank, and the interval between each batch addition is 5-8 minutes;

[0070] (2) During the fiber addition process, gradually increase the stirring speed to 300-350 r / min to allow the fibers to disperse quickly in the water and avoid fiber accumulation on the water surface;

[0071] Step 6: Fiber dispersion and intensified stirring, as follows:

[0072] (1) Increase the stirring speed to 400-450 r / min and continue stirring for 20-30 min; through high-speed stirring, further disperse the fibers, fully separate the fibers, and form a uniform fiber suspension;

[0073] (2) Take samples from the stirring tank every 5 minutes to observe the dispersion state of the fibers. If there is fiber agglomeration in the dispersion state of the fibers, extend the stirring time or increase the amount of dispersant.

[0074] Step 7: Add binder and defoamer, as follows:

[0075] (1) Order of adding additives: First, slowly add the weighed binder into the stirring tank and stir for 10-15 minutes to allow the binder to fully dissolve and mix evenly with the fiber; then add the defoamer and continue stirring for 5-8 minutes to eliminate the foam generated during the stirring process;

[0076] (2) Stirring speed control: During the process of adding additives, the stirring speed is maintained at 300-350 r / min to ensure that the additives can be evenly dispersed in the fiber suspension;

[0077] Step 8: Finely mix and stir, as follows:

[0078] (1) Reduce the stirring speed to 200-250 r / min and perform fine mixing for 15-20 min; low-speed stirring helps to evenly mix the various ingredients and reduce fiber damage;

[0079] (2) Slurry testing, as follows:

[0080] Use a viscometer to measure the viscosity of the slurry, which is required to be controlled between 30-50 mPa·s;

[0081] Use a pH meter to test the pH of the slurry. The pH value should be controlled within the range of 6.5-7.5.

[0082] If the test results do not meet the requirements, the dosage of the additives must be adjusted in time;

[0083] Step 9: Turn off the heating device of the stirring tank, turn on the cooling system, and reduce the slurry temperature to 25-30°C. The cooling rate is controlled at 1-2°C / min.

[0084] Step 10: Stop stirring and let the slurry stand in the stirring tank for 10-15 minutes to allow the bubbles in the slurry to fully escape and allow the fiber and additives to further stabilize the combination;

[0085] Step 11: Slurry quality re-inspection and transportation, as follows:

[0086] (1) Quality re-inspection: Re-test the viscosity and pH value of the slurry after standing, and observe the uniformity and stability of the slurry; if all indicators meet the requirements, the slurry is considered qualified; if not, adjustments are required;

[0087] (2) Slurry delivery: Turn on the slurry delivery pump and deliver the qualified slurry through the pipeline to the subsequent molding process; during the delivery process, control the delivery pressure at 0.3-0.5MPa to ensure smooth slurry delivery and no leakage.

[0088] project Traditional crafts Example Decrease / Increase Total energy consumption (kWh / t) 45-50 30-35 30％↓ Single batch time 2.5-3h 1.5-2h 40％↓ Fiber utilization 85-90％ 95-98％ 10％↑

[0089] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A mixing and stirring process for producing glass fiber separator pulp, characterized in that: The specific steps include: Step 1: Raw material pretreatment and preparation, as follows: (1) The glass fiber raw yarn is opened by a special opening device to disperse the fiber bundle into a single filament state. The opening degree must reach more than 95% to avoid fiber agglomeration in subsequent pulping; (2) Accurately weigh the dispersant and binder according to the formula requirements, and control the weighing error within ±0.5%; (3) Prepare deionized water that meets production requirements to ensure pulping quality; Step 2: Check and debug the mixing equipment, as follows: (1) Use a high-pressure water gun and special cleaning agent to thoroughly clean the mixing tank, mixing paddle, and pipes to ensure that there are no residual impurities; after cleaning, wipe the surface of the equipment with a clean rag; (2) Check whether the agitator is firmly installed and whether the blades are deformed or worn; check the tightness of the belt of the transmission system to ensure that the belt does not slip; check the lubrication of the bearings and add grease in time; Step 3: Add water and initially heat up, as follows: (1) Inject the prepared deionized water into the mixing tank through the pipeline until the volume of the mixing tank is 60%-70%; control the water injection speed to avoid excessive water flow and the generation of a large amount of foam; (2) Start the heating device of the stirring tank and slowly raise the water temperature to 35-40°C, with the heating rate controlled at 1-2°C / min; use a temperature sensor to monitor the water temperature in real time and adjust it through the control system; Step 4: Add dispersant, as follows: (1) Dispersant dissolution; (2) Use a sampler to take 1-5 ml of the dispersion from the stirring tank and observe the dissolution of the dispersant under a microscope to ensure that there are no obvious particulate matter; Step 5: Add glass fiber raw materials, as follows: (1) Add the fiberized glass fiber raw material into the stirring tank in batches and gradually add it; the amount added each time should not exceed 20% of the remaining volume of the stirring tank, and the interval between each batch addition is 5-8 minutes; (2) During the fiber addition process, gradually increase the stirring speed to 300-350 r / min to allow the fibers to disperse quickly in the water and avoid fiber accumulation on the water surface; Step 6: Fiber dispersion and intensified stirring, as follows: (1) Increase the stirring speed to 400-450 r / min and continue stirring for 20-30 min; through high-speed stirring, further disperse the fibers, fully separate the fibers, and form a uniform fiber suspension; (2) Take samples from the stirring tank every 5 minutes to observe the dispersion state of the fibers; Step 7: Add binder and defoamer, as follows: (1) Order of adding additives: First, slowly add the weighed binder into the stirring tank and stir for 10-15 minutes to allow the binder to fully dissolve and mix evenly with the fiber; then add the defoamer and continue stirring for 5-8 minutes to eliminate the foam generated during the stirring process; (2) Stirring speed control: During the process of adding additives, the stirring speed is maintained at 300-350 r / min to ensure that the additives can be evenly dispersed in the fiber suspension; Step 8: Finely mix and stir, as follows: (1) Reduce the stirring speed to 200-250 r / min and perform fine mixing for 15-20 min; low-speed stirring helps to evenly mix the various ingredients and reduce fiber damage; (2) Slurry testing; Step 9: Turn off the heating device of the stirring tank, turn on the cooling system, and reduce the slurry temperature to 25-30°C. The cooling rate is controlled at 1-2°C / min. Step 10: Stop stirring and let the slurry stand in the stirring tank for 10-15 minutes to allow the bubbles in the slurry to fully escape and allow the fiber and additives to further stabilize the combination; Step 11: Slurry quality re-inspection and transportation.

2. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: In the step 1, the dispersant is polyethylene oxide, the binder is acrylate, and the mixing mass ratio between the dispersant and the binder is 1:6-10.

3. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: The temperature of the deionized water in step 1 is set to 20-25° C., and the water conductivity is not higher than 5 μS / cm.

4. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: The dissolution of the dispersant in step 4 is specifically as follows: Slowly add the weighed dispersant into the stirring tank, turn on the agitator at the same time, and set the stirring speed to 150-200r / min; control the stirring time to 10-15min to allow the dispersant to fully dissolve in the water to form a uniform dispersion.

5. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: If there is fiber agglomeration in the dispersed state of the fibers in step 6, the stirring time should be extended or the amount of the dispersant should be increased.

6. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: The slurry detection in step eight is specifically as follows: Use a viscometer to measure the viscosity of the slurry, which is required to be controlled between 30-50 mPa·s; Use a pH meter to test the pH of the slurry. The pH value should be controlled within the range of 6.5-7.

5. If the test results do not meet the requirements, the dosage of additives must be adjusted in time.

7. The mixing and stirring process for producing glass fiber separators according to claim 1, characterized in that: The slurry quality re-inspection and transportation in step 11 are as follows: (1) Quality re-inspection: Re-test the viscosity and pH value of the slurry after standing, and observe the uniformity and stability of the slurry; if all indicators meet the requirements, the slurry is considered qualified; if not, adjustments are required; (2) Slurry delivery: Turn on the slurry delivery pump and deliver the qualified slurry through the pipeline to the subsequent molding process; during the delivery process, control the delivery pressure at 0.3-0.5MPa to ensure smooth slurry delivery and no leakage.