Method for detecting dispersibility of compacted talcum powder for plastic filling

Abstract

The invention provides a method for detecting the dispersibility of compacted talcum powder for plastic filling, which comprises the following steps: S1, drying the compacted talcum powder in a constant-temperature drying box to obtain dried compacted talcum powder; s2, adding liquid epoxy resin into the dried compacted talcum powder obtained in S1 to obtain a first mixture, and adding the liquid epoxy resin into the first mixture to obtain a second mixture; s3, stirring the second mixture by adopting a stirrer to obtain slurry; and S4, after stirring is finished, the slurry is poured into the screen, the stirrer and the screen are washed, and residual small blocks on the screen are dried. By drying the compacted talcum powder, moisture adsorbed by the talcum powder due to compaction or environmental humidity is eliminated, agglomeration caused by capillary force among particles is reduced, and the detection accuracy is improved; resin similar to the prepared plastic is mixed with the compacted talcum powder, so that the use state of the compacted talcum powder is simulated, and the detection accuracy is improved.

Description

Technical Field

[0001] This invention belongs to the field of talc testing technology, specifically relating to a method for testing the dispersibility of compacted talc powder used as a plastic filler. Background Technology

[0002] Compacted talc powder refers to the process of compacting talc powder to increase its bulk density, improve its physical and chemical properties, and facilitate subsequent processing and application. Compacted talc powder reduces its volume, thereby lowering transportation costs and preventing packaging bags from bursting during transport. Compacted talc powder is also easier to mix evenly with other materials and is more easily fed into the screw during plastic filling, improving production efficiency.

[0003] Compaction optimizes the performance of talc powder, broadening its application range and meeting the specific needs of various industries. However, compaction can lead to uneven or incomplete dispersion of the talc powder after feeding, resulting in agglomeration in the finished plastic products. Therefore, testing methods are needed to confirm whether the dispersibility of compacted talc powder meets the requirements of downstream customers.

[0004] In existing methods for testing the dispersibility of compacted talc, the compacted talc is dissolved in water to form a slurry. Due to the hydrophobic nature of talc, its solubility in water is low. However, since plastics are generally made from organic materials such as resins, existing methods for testing the dispersibility of compacted talc in water cannot accurately detect its dispersibility in plastic preparation, leading to inaccurate test results. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides a method for detecting the dispersibility of compacted talc powder used as a plastic filler, ensuring accurate detection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for testing the dispersibility of compacted talc powder for plastic fillers includes the following steps: S1. Place the compacted talc powder in a constant temperature drying oven to dry it, and obtain the dried compacted talc powder. S2. Add the dried and compacted talc powder obtained in S1 to liquid epoxy resin to obtain a first mixture. Add liquid epoxy resin to the first mixture to obtain a second mixture. S3. Stir the second mixture using a stirrer to obtain a slurry; S4. After mixing, pour the slurry onto the screen and rinse the mixer and screen with running water until the foam on the screen is completely removed. Dry any small clumps remaining on the screen and determine the mass of the remaining clumps.

[0007] Furthermore, in S1, the drying temperature is 105±5℃ and the drying time is 4-5 hours.

[0008] Furthermore, in S2, the compacted talc powder is 100g, and the liquid epoxy resin in the first mixture is 200g, and 200g of liquid epoxy resin is added to the first mixture.

[0009] Further, in S3, the impeller of the stirrer is inserted into the beaker containing the second mixture, and it is checked and confirmed that there is a 2cm gap between the bottom of the impeller and the bottom of the beaker; then the stirrer is turned on.

[0010] Furthermore, in S3, the stirrer speed is 1200 r / min, and the stirring time is 45-50 min.

[0011] Further, in S4, the agitator is rinsed with flowing water and the slurry on the agitator is fed into the screen.

[0012] Furthermore, in S4, the sieve aperture is 100 micrometers.

[0013] This application has the following beneficial effects: 1. By drying the compacted talc powder, the moisture adsorbed by the talc powder due to compaction or environmental humidity is eliminated, reducing the agglomeration caused by capillary forces between particles and improving the accuracy of detection.

[0014] 2. By mixing compacted talc with a resin similar to that used in plastic preparation, the usage state of compacted talc is simulated, which improves the accuracy and precision of the test results, and also increases the efficiency of the test. Detailed Implementation

[0015] The present application will be further described in detail below with reference to the embodiments.

[0016] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0017] Example 1: A method for testing the dispersibility of compacted talc powder for plastic fillers, comprising the following steps: S1. Place the compacted talc powder in a constant temperature drying oven to dry it, and obtain the dried compacted talc powder; the drying temperature is 105℃ and the drying time is 4 hours.

[0018] S2. Add 100g of dried compacted talc powder obtained in S1 to 200g of liquid epoxy resin to obtain a first mixture. Add 200g of liquid epoxy resin to the first mixture to obtain a second mixture.

[0019] S3. Stir the second mixture using a stirrer to obtain a slurry; insert the impeller of the stirrer into the beaker containing the second mixture, and check to ensure that there is a 2cm gap between the bottom of the impeller and the bottom of the beaker; turn on the stirrer. The stirrer speed is 1200 r / min, and the stirring time is 45 min.

[0020] S4. After mixing, pour the slurry onto a sieve and rinse the agitator and sieve with running water until all foam is removed from the sieve. Dry any small clumps remaining on the sieve and determine their mass. Rinse the agitator with running water and allow the slurry on the agitator to enter the sieve. The sieve has a mesh size of 100 micrometers.

[0021] Comparative Example 1: The difference between this comparative example and Example 1 is that the operation S1 in Example 1 is not used, as follows: A method for testing the dispersibility of compacted talc powder for plastic fillers includes the following steps: S1. Add 100g of compacted talc powder to 200g of liquid epoxy resin to obtain a first mixture. Add 200g of liquid epoxy resin to the first mixture to obtain a second mixture.

[0022] S2. Stir the second mixture using a stirrer to obtain a slurry; insert the impeller of the stirrer into the beaker containing the second mixture, and check to ensure that there is a 2cm gap between the bottom of the impeller and the bottom of the beaker; turn on the stirrer. The stirrer speed is 1200 r / min, and the stirring time is 45 min.

[0023] S3. After mixing, pour the slurry onto a sieve and rinse the agitator and sieve with running water until all foam is removed from the sieve. Dry any small clumps remaining on the sieve and determine their mass. Rinse the agitator with running water and allow the slurry on the agitator to enter the sieve. The sieve aperture is 100 micrometers.

[0024] Comparative Example 2: The only difference from Example 1 is that the operation in S1 of Example 1 is not used, and the liquid epoxy resin is replaced with water, as follows: A method for testing the dispersibility of compacted talc powder for plastic fillers includes the following steps: S1. Add 100g of compacted talc powder to 200g of water to obtain the first mixture. Add 200g of water to the first mixture to obtain the second mixture.

[0025] S2. Stir the second mixture using a stirrer to obtain a slurry; insert the impeller of the stirrer into the beaker containing the second mixture, and check to ensure that there is a 2cm gap between the bottom of the impeller and the bottom of the beaker; turn on the stirrer. The stirrer speed is 1200 r / min, and the stirring time is 45 min.

[0026] S3. After mixing, pour the slurry onto a sieve and rinse the agitator and sieve with running water until all foam is removed from the sieve. Dry any small clumps remaining on the sieve and determine their mass. Rinse the agitator with running water and allow the slurry on the agitator to enter the sieve. The sieve aperture is 100 micrometers.

[0027] Experimental Example: The residual rate of small clumps on the sieve was tested. The residual rate of small clumps = residual mass of small clumps / original mass. It is known that the residual rate of undissolved small clumps in compacted talc powder used to prepare plastics is 1.2%. The experimental results are shown in Table 1.

[0028] Table 1. Test Data for Experimental Examples Residual mass of small clumps / g Original material / g Residual rate of small clumps % Example 1 1.3 100 1.3 Comparative Example 1 3.2 100 3.2 Comparative Example 2 4.5 100 4.5 Results Analysis: Based on the data in Table 1, we analyzed Example 1, Comparative Example 1, and Comparative Example 2.

[0029] As can be seen from Example 1, the small clumping residue rate of 1.3% detected in Example 1 is closer to the actual residue rate of 1.2%.

[0030] As shown in Comparative Example 1, when compacted talc powder is not pre-dried, the detected residual rate of 3.2% is significantly different from the actual residual rate of 1.2%, indicating that the result is inaccurate.

[0031] As shown in Comparative Example 2, when compacted talc powder is not pre-dried and water is used to test the dispersibility of compacted talc powder, the detected residual rate of 4.5% is significantly different from the actual residual rate of 1.2%, indicating that the result is inaccurate.

[0032] This is because drying the compacted talc powder eliminates the moisture adsorbed by the talc powder due to compaction or environmental humidity, reduces agglomeration caused by capillary forces between particles, and improves the accuracy of the test.

[0033] By mixing a resin similar to that used in plastic preparation with compacted talc, the working state of compacted talc was simulated, improving both the accuracy and efficiency of the test.

[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0035] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for testing the dispersibility of compacted talc powder used as a plastic filler, characterized in that, Includes the following steps: S1. Place the compacted talc powder in a constant temperature drying oven to dry it, and obtain the dried compacted talc powder. S2. Add the dried and compacted talc powder obtained in S1 to liquid epoxy resin to obtain a first mixture. Add liquid epoxy resin to the first mixture to obtain a second mixture. S3. Stir the second mixture using a stirrer to obtain a slurry; S4. After mixing, pour the slurry onto the screen and rinse the mixer and screen with running water until the foam on the screen is completely removed. Dry any small clumps remaining on the screen and determine the mass of the remaining clumps.

2. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In S1, the drying temperature is 105±5℃ and the drying time is 4-5 hours.

3. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In S2, the compacted talc powder is 100g, and the liquid epoxy resin in the first mixture is 200g. 200g of liquid epoxy resin is added to the first mixture.

4. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In step S3, insert the impeller of the stirrer into the beaker containing the second mixture, and check to ensure that there is a 2cm gap between the bottom of the impeller and the bottom of the beaker; then turn on the stirrer.

5. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In S3, the stirrer speed is 1200 r / min, and the stirring time is 45-50 min.

6. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In S4, the agitator is rinsed with flowing water and the slurry on the agitator is fed into the screen.

7. The method for testing the dispersibility of compacted talc powder for plastic fillers according to claim 1, characterized in that, In S4, the sieve aperture is 100 micrometers.