Rapid detection method for dust content in polyamide slice

Abstract

The invention relates to a method for rapidly detecting the dust content in polyamide slices, which comprises the following steps: drying and weighing by weighing equipment, sampling, oscillating and washing, filtering, oscillating and washing again, filtering again, drying and weighing again, and rapidly calculating the dust content in the polyamide slices through a formula. The dust content in the polyamide slices can be rapidly and accurately detected, and reliable experimental data is provided for quality supervision of the polyamide slices; the technical problems that the amount of dust generated by violent collision between particles or between particles and a conveying pipeline in the gas conveying process of existing polyamide slices is gradually increased from sampling of a vibrating screen, a middle stock bin and a finished product stock bin, the external quality of the slices is seriously affected, and meanwhile normal use of downstream spinning and injection molding customers is affected are solved. Compared with the prior art, the device has good market prospect and development space.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyamide production, and particularly relates to a rapid detection method for the dust content in polyamide chips. Background Art

[0002] Polyamide is commonly known as nylon. Due to its excellent performance, it is widely used in engineering plastics, chemical fibers, and civil fields. The amount of dust generated by the violent collision between particles or between particles and the conveying pipeline during the gas conveying process of polyamide chips shows a gradually increasing trend when sampling from the vibrating screen, intermediate bin, and finished product bin, seriously affecting the external quality of the chips, and at the same time, it will also affect the normal use of downstream spinning and injection molding customers.

[0003] Dust seriously affects the external quality of polyamide chips. Timely detection of the dust content in polyamide chips helps production personnel monitor the product quality in a timely manner, discover problems existing in the production line and solve them. Currently, there is no relevant detection method.

[0004] How to design a method that is reasonable, feasible, ingenious, can quickly and accurately detect the dust content in polyamide chips, and provide reliable experimental data for the quality supervision of polyamide chips is a technical problem that needs to be solved currently. Summary of the Invention

[0005] During the gas conveying process of polyamide chips, violent collisions occur between particles or between particles and the conveying pipeline, thereby generating the amount of dust. The amount of dust shows a gradually increasing trend when sampling from the vibrating screen, intermediate bin, and finished product bin, which will seriously affect the quality of the chips and at the same time, it will also affect the normal use of downstream spinning and injection molding customers and other technical problems. To solve this problem, the present invention provides a rapid detection method for the dust content in polyamide chips. This method is reasonable, feasible, ingenious, can quickly and accurately detect the dust content in polyamide chips, and provide reliable experimental data for the quality supervision of polyamide chips.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a rapid detection method for the dust content in polyamide chips, comprising the following steps:

[0007] Step 1: Place a clean weighing bottle and filter paper in an oven to dry. After taking them out, place them in a desiccator to cool, and weigh them, denoted as M1. At this time, M1 is the weight of the weighing bottle + filter paper;

[0008] Step 2: Weigh 100 g of polyamide sample with a clean and dry beaker, denoted as M. At this time, M is the weight of the polyamide sample;

[0009] Step 3: Take a clean washing basin, add an appropriate amount of high-purity water, place the sample splitter sieve in the washing basin, then pour the sample into the sample splitter sieve, wash the beaker thoroughly with high-purity water, and pour the washing water into the washing basin;

[0010] Step 4: Vigorously shake and wash the sample splitter sieve containing the sample in the washing basin;

[0011] Step 5: Place the round filter paper on the filtering end of the microporous filter, and complete the installation of the microporous filter;

[0012] Step 6: Pour the high-purity water with dust in the washing basin into the microporous filter to filter out the dust;

[0013] Step 7: Put the sample splitter sieve that has been washed once into another clean washing basin, pour an appropriate amount of high-purity water and shake and wash it again;

[0014] Step 8: Pour the high-purity water with dust into the filter to filter out the dust again until all the dust is filtered out;

[0015] Step 9: Put the filter paper with dust filtered on the surface into a weighing bottle, dry it in an oven, then cool it in a desiccator, and weigh it. Record the weight as M2. At this time, M2 is the weight of the weighing bottle + the filter paper with dust filtered on the surface;

[0016] Step 10: Through the mass fraction formula X = (M2 - M1) / M × 100%, the dust content in the sample can be calculated.

[0017] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, the drying temperature of the oven in Step 1 and Step 9 is 105°C, the drying time is 1 hour, and the cooling time after drying is 30 minutes.

[0018] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, the weight of the polyamide sample taken in Step 2 is accurate to four decimal places.

[0019] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, the mesh number of the sample splitter sieve in Step 3 is 10 - 20 meshes.

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

[0021] 1. The detection method of the present invention includes drying and weighing the weighing equipment, sampling, shaking and washing, filtering, shaking and washing again, filtering again, and drying and weighing again. The dust content in polyamide chips can be quickly calculated through the formula. The method of the present invention is reasonable and feasible, with a clever design, and can quickly and accurately detect the dust content in polyamide chips, providing reliable experimental data for the quality supervision of polyamide chips.

[0022] 2. The technical solution of the present invention detects the dust content in solid samples for the first time, adopts the washing and suction filtration method, has a short test time and accurate test results.

[0023] 3. The instruments and consumables used in the detection of the present invention are easily available, with low costs, simple steps and easy operation.

[0024] 4. The present invention can quickly detect the dust content in polyamide chips, enabling production personnel to detect the product quality in a timely manner, facilitating the adjustment of the production process, and improving the product quality and production efficiency. Specific Embodiments

[0025] The following further elaborates on the specific embodiments of the present invention in conjunction with the examples.

[0026] A rapid detection method for the dust content in polyamide chips includes the following steps:

[0027] Step 1: Put a clean weighing bottle and filter paper into the oven for drying, take them out and place them in a desiccator for cooling, and weigh them, denoted as M1. At this time, M1 is the weight of the weighing bottle + filter paper.

[0028] Step 2: Weigh 100 g of polyamide sample with a clean and dry beaker, denoted as M. At this time, M is the weight of the polyamide sample.

[0029] Step 3: Take a clean washing basin, add an appropriate amount of high-purity water, place the sample sieve in the washing basin, then pour the sample into the sample sieve, wash the beaker thoroughly with high-purity water, and pour the washing water into the washing basin.

[0030] Step 4: Vigorously shake and wash the sample sieve containing the sample in the washing basin.

[0031] Step 5: Place the round filter paper at the filtering end of the microporous filter, and install the microporous filter completely.

[0032] Step 6: Pour the high-purity water with dust in the washing basin into the microporous filter to filter the dust.

[0033] Step 7: Put the sample sieve washed once into another clean washing basin, pour an appropriate amount of high-purity water and shake and wash it again.

[0034] Step 8: Pour the high-purity water with dust into the filter to filter the dust again until all the dust is filtered out.

[0035] Step 9: Put the filter paper with dust filtered on the surface into a weighing bottle, dry it in an oven, then cool it in a desiccator, and weigh it. Record the weight as M2. At this time, M2 is the weight of the weighing bottle + the filter paper with dust filtered on the surface.

[0036] Step 10: Through the mass fraction formula X = (M2 - M1) / M × 100%, the dust content in the sample can be calculated.

[0037] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, in the above-mentioned Step 1 and Step 9, the drying temperature of the oven is 105°C, the drying time is 1 hour, and the cooling time after drying is 30 minutes.

[0038] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, the weight of the polyamide sample taken in the above-mentioned Step 2 is accurate to four decimal places.

[0039] The above is the basic implementation mode of the present invention, and further improvements, perfection and limitations can be made on this basis: for example, the mesh number of the splitting sieve in the above-mentioned Step 3 is 10 - 20 meshes.

[0040] The detection method of the present invention is specifically as follows.

[0041] Experimental equipment: sand core filtration device, washing basin, weighing bottle, filter paper, beaker, splitting sieve, analytical balance, oven, desiccator;

[0042] Experimental reagents: high-purity water;

[0043] Using the above method, the following table shows five groups of different experimental comparison data.

[0044] Table 1 Determination results of dust content in polyamide chips

[0045]

[0046]

[0047] As can be seen from Table 1, when the dust content in the polyamide chips is less than 60 ppm, it is a qualified product.

[0048] The method of the present invention is reasonable and feasible, with ingenious design. It can quickly and accurately detect the dust content in polyamide chips, providing reliable experimental data for the quality supervision of polyamide chips, and solving the technical problems that the dust quantity in existing polyamide chips shows a gradually increasing trend when sampling from the vibrating screen, intermediate silo, and finished product silo, seriously affecting the external quality of the chips and the normal use of downstream spinning and injection molding customers. For the existing technology, it has good market prospects and development space.

[0049] The preferred specific embodiments and examples of the present invention are described in detail above in conjunction with the table. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of the present invention.

Claims

1. A rapid detection method for dust content in polyamide slices, characterized in that: The following steps are involved: Step 1: Place a clean weighing bottle and filter paper in an oven to dry, take them out and place them in a dryer to cool, weigh them, and record their weight as M1, where M1 is the weight of the weighing bottle + filter paper; Step 2: Use a clean, dry beaker to weigh 100 g of the polyamide sample, recorded as M, where M is the weight of the polyamide sample; Step 3: Take a clean washing basin, add an appropriate amount of high-purity water, place the sample sieve in the washing basin, then pour the sample into the sample sieve, fully wash the beaker with high-purity water, and pour the washing water into the washing basin; Step 4: Fully shake and wash the sample sieve containing the sample in a washing basin; Step 5, placing the circular filter paper on the filter end of the microporous filter, and installing the microporous filter; Step 6: Pour the high-purity water with dust in the washing basin into a microporous filter to filter out the dust; Step 7: Place the washed sample sieve into another clean washing basin, add an appropriate amount of high-purity water, and shake and wash again; Step 8, pour the high-purity water with dust into the filter to filter out the dust again until all the dust is filtered out; Step nine, put the filter paper with dust on the surface into a weighing bottle, dry it in an oven, put it into a dryer to cool, and weigh it, recorded as M2, where M2 is the weight of the weighing bottle + the filter paper with dust on the surface; Step 10: Calculate the dust content in the sample using the mass fraction formula X=(M2-M1) / M×100%.

2. The method for rapid detection of dust content in polyamide slices according to claim 1, characterized in that: The drying temperature of the oven in step 1 and step 9 is 105° C., the drying time is 1 hour, and the cooling time after drying is 30 minutes.

3. The method for rapid detection of dust content in a polyamide slice according to claim 1, characterized in that: The weight of the polyamide sample weighed in step 2 is accurate to four decimal places.

4. The method for rapid detection of dust content in polyamide slices according to claim 1, characterized in that: The mesh size of the sample separation sieve in step 3 is 10-20 meshes.

Images