A self-lubricating filtering sample bottle and its preparation process

Abstract

The present invention belongs to the technical field of polymer materials and experimental instruments, and provides a self-lubricating filtering sample bottle and a preparation process thereof, comprising an outer tube and an inner tube, wherein the inner tube is movably arranged in the outer tube along the axial direction of the outer tube; the inner tube is manufactured with a first modified polypropylene as a raw material, and the outer tube is manufactured with a second modified polypropylene as a raw material; by weight, the first modified polypropylene includes 100 parts of a first polypropylene, 10 to 15 parts of a first lubricant, and 1 to 10 parts of a second lubricant; by weight, the second modified polypropylene includes 100 parts of a second polypropylene and 1 to 10 parts of a second lubricant. The filtering sample bottle of the present invention can ensure sufficient lubrication and coordination of the inner tube and the outer tube while ensuring the sealing of the entire product, and the pressing process is smooth and free of jamming, and the entire filtering process is safe and relatively easy.

Description

Technical Field

[0001] The present application relates to the technical field of polymer materials and experimental instruments, and in particular to a self-lubricating filtering sample bottle and a preparation process thereof. Background Art

[0002] Before the existing technology uses liquid chromatography to test the substance to be tested, the substance to be tested needs to be filtered, and a filter sample bottle is often used for filtering in this process. The filter sample bottle is a simple filtering device that integrates a needle filter, a syringe, a sample bottle, a septum and a bottle cap. Its structure includes a sample cup, a pressure ring, a one-way filter membrane, an inner filter tube, a cover pad and a cover body; its main operating mode is that there is a size difference between the sample cup and the inner filter tube, that is, the outer diameter of the inner filter tube is slightly larger than the inner diameter of the sample cup, so that the inner filter tube generates internal pressure on the sample cup during the downward pressure process, so that the liquid in the sample cup enters the inner filter tube through the single-layer filter membrane. The size difference between the inner filter tube and the sample cup will lead to an increase in the friction between the two, that is, the pressure required to press the inner filter tube down will increase, thereby affecting the user experience.

[0003] At present, there are few improvement solutions for the above problems in the prior art, and only propose that the outer diameter of the inner filter tube and the inner diameter of the sample cup are similar, and the inner filter tube surface clamping ring and the inner wall of the sample cup form interference to ensure sealing. However, this improvement will not have a positive effect on reducing friction.

[0004] In addition, the inner filter tube and sample cup of the filter sample bottle are usually made of polypropylene. The inner filter tube and sample cup are tightly fitted together and cannot be pressed, or there is a jam during the pressing process and it is not smooth enough.

[0005] Due to the limitations of polypropylene materials, the existing technology continuously modifies polypropylene, and then uses modified polypropylene as raw material to prepare experimental and medical consumables. For example, the patent with publication number CN104086905B discloses a modified polypropylene soft bottle material and its preparation method and application. The preparation method of the modified polypropylene soft bottle material includes: (1) mixing ethylene-propylene-based thermoplastic elastomer or styrene-based thermoplastic elastomer with random copolymer polypropylene, phenolic antioxidant and phosphite antioxidant, and then granulating by extruder underwater to obtain granular elastomer masterbatch; (2) dry-mixing the random copolymer polypropylene with the elastomer masterbatch to obtain the modified polypropylene soft bottle material; the random copolymer polypropylene used in step (2) is more than the random copolymer polypropylene used in step (1). The modified polypropylene soft bottle material obtained by the invention has excellent physical properties and safety performance in contact with liquid medicine, and can meet the requirements of the blow-fill-seal process to prepare soft bottles (bags). The obtained polypropylene soft bottles (bags) are soft, have good self-closing effect and high impact strength. However, the modified polypropylene soft bottle material does not solve the problem of insufficient lubricity of the material and is still not suitable for the preparation of filtering sample bottles. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a self-lubricating filtering sample bottle and a preparation process thereof to solve the problem in the prior art that the size difference between the inner filter tube and the sample cup in the existing filtering sample bottle increases the friction between the two, thereby increasing the pressure required to press down the inner filter tube, affecting the user experience, and the like.

[0007] To achieve the above and related purposes, the present invention adopts the following technical solutions:

[0008] A first aspect of the present invention provides a self-lubricating filtering sample bottle, comprising an outer tube and an inner tube, wherein the inner tube is movably arranged in the outer tube along the axial direction of the outer tube;

[0009] The inner tube is manufactured from the first modified polypropylene as a raw material, and the outer tube is manufactured from the second modified polypropylene as a raw material;

[0010] The first modified polypropylene includes 100 parts of the first polypropylene, 10-15 parts of the first lubricant, and 1-10 parts of the second lubricant, in parts by mass;

[0011] Calculated by weight, the second modified polypropylene includes 100 parts of second polypropylene and 1 to 10 parts of second lubricant.

[0012] In one embodiment of the present application, the first lubricant is polyoxyethylene.

[0013] In one embodiment of the present application, the second lubricant is stearic acid.

[0014] In one embodiment of the present application, the melt flow rate of the first polypropylene is greater than the melt flow rate of the second polypropylene.

[0015] In one embodiment of the present application, the rigidity of the first polypropylene is greater than the rigidity of the second polypropylene.

[0016] In one embodiment of the present application, the filtering sample bottle also includes a pressing ring, which is arranged in the outer tube. The inner tube presses the pressing ring tightly against the bottom of the outer tube, and the pressing ring is made of the first polypropylene as raw material.

[0017] In one embodiment of the present application, the filtering sample bottle further includes a cover body, the inner tube has an opening at one end away from the outer tube, the cover body is arranged on the opening of the inner tube, and the cover body is manufactured using the first polypropylene as a raw material.

[0018] A second aspect of the present invention provides a process for preparing a self-lubricating filtering sample bottle, comprising the following steps:

[0019] preparing a first modified polypropylene and a second modified polypropylene;

[0020] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0021] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0022] Assemble the inner and outer tubes into a filtration vial.

[0023] In one embodiment of the present application, the preparation method of the first modified polypropylene is: mixing the first polypropylene, the first lubricant, and the second lubricant in a mass ratio of 100: (10-15): (1-10), and extruding to obtain the first modified polypropylene.

[0024] In one embodiment of the present application, the preparation method of the second modified polypropylene is: mixing the second polypropylene and the second lubricant in a mass ratio of 100:(1-10), extruding and molding, to obtain the second modified polypropylene.

[0025] The beneficial technical effects of the present invention are:

[0026] The present invention uses a first polypropylene, polyoxyethylene (POE oil) and stearic acid as raw materials to prepare a first modified polypropylene, and uses the first modified polypropylene as raw materials to form an inner tube by injection molding, so that a uniform oil film is formed on the surface of the inner tube. A second modified polypropylene is then prepared using a second polypropylene and stearic acid as raw materials, and uses the second modified polypropylene as raw materials to form an outer tube by injection molding, so that a uniform oil film is formed on the surface of the outer tube. Furthermore, when the outer tube and the inner tube are combined into a filtering sample bottle, the filtering sample bottle has a self-lubricating effect. Therefore, when it is used for filtering, the required filtering pressure is lower than that of similar filtering sample bottles, and multiple groups of samples can be filtered at one time under the same pressure, thereby increasing the sample processing capacity and saving experimental time.

[0027] In addition, the present invention defines the first polypropylene and the second polypropylene materials, and selects different polypropylene materials suitable for the inner tube and the outer tube through multiple groups of experimental test analysis results to ensure that the inner tube and the outer tube fit tightly. After determining the base materials of the inner tube and the outer tube, the present invention selects the type of lubricant suitable for different polypropylene materials and the amount of lubricant added through multiple groups of experiments to ensure that the filtration pressure of the inner tube and the outer tube can be significantly reduced and the best solution is obtained.

[0028] In summary, the filtering sample bottle of the present invention can ensure the sealing of the entire product while ensuring sufficient lubrication and coordination between the inner tube and the outer tube. The pressing process is smooth and free of jams, and the entire filtering process is safe and relatively easy.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0031] Figure 1 A graph showing the test results of filtration compression force of filtration sample bottles prepared with inner tubes and outer tubes of different substrates for this application;

[0032] Figure 2 This is a graph showing the test results of filtration compression force of filtration sample bottles of Example 4 and Comparative Examples 5 to 7 of the present application;

[0033] Figure 3 This is a schematic diagram of the structure of the filtration sample bottle for this application;

[0034] Reference numerals

[0035] 1: Outer tube; 2: Inner tube; 3: Cover body; 4: Cover pad. DETAILED DESCRIPTION

[0036] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the invention belongs. It should be understood that certain features of the invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. On the contrary, multiple features of the invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or in any other described embodiment of the invention when appropriate. Certain features described in the context of various embodiments will not be considered as essential features of those embodiments unless the embodiment is inoperable without those elements. The present invention is further described below by specific specific examples, but it should be noted that the specific process conditions and results described in the embodiments of the present invention are only used to illustrate the present invention, and cannot be used to limit the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be included in the scope of protection of the present invention.

[0037] First of all, it should be noted that the first polypropylene is specifically SK370Y produced by SK energy, which has a melt index of 18g / 10min, a Vicat softening point of 135°C, an elongation greater than 500%, a fluidity greater than 800mm, and a heat deformation temperature of 94°C.

[0038] The second polypropylene is specifically BN7000-TH20 produced by Guangdong Haina Plastic Technology Co., Ltd., with a melt flow rate of 2.65 g / 10 min, a density of 0.875 g / cm3, a melting temperature of 126°C, and a bending strength of 15.3 MPa.

[0039] Due to the size difference between the inner filter tube and the sample cup in the existing filtering sample bottle, the friction between the two increases, so the pressure required to press down the inner filter tube increases, which affects the user experience. The present invention provides a self-lubricating filtering sample bottle and a preparation process thereof, which is manufactured using a modified polypropylene material with low friction. On the basis of ensuring the tightness of the filtering sample bottle, its self-lubricating property is improved, so that the pressing process is smoother and less stuck, thereby making the entire experimental process safe and relatively easy.

[0040] The present invention provides a self-lubricating filtering sample bottle, such as Figure 3 As shown, it comprises an outer tube 1 and an inner tube 2, wherein the inner tube 2 is movably arranged inside the outer tube 1 along the axial direction of the outer tube 1;

[0041] The inner tube 2 is manufactured using the first modified polypropylene as a raw material, and the outer tube 1 is manufactured using the second modified polypropylene as a raw material;

[0042] The first modified polypropylene includes 100 parts of the first polypropylene, 10-15 parts of the first lubricant, and 1-10 parts of the second lubricant, in parts by mass;

[0043] Calculated by weight, the second modified polypropylene includes 100 parts of second polypropylene and 1 to 10 parts of second lubricant.

[0044] Further, the first polypropylene is SK370Y, and the second polypropylene is BN7000-TH20. The melt flow rate of the first polypropylene is greater than the melt flow rate of the second polypropylene. The rigidity of the first polypropylene is greater than the rigidity of the second polypropylene.

[0045] The present invention selects the first polypropylene as the inner tube substrate and the second polypropylene as the outer tube substrate through the following experiments, as follows:

[0046] Material 1 (polypropylene material produced by Shanghai Manhua Plastic Raw Materials Co., Ltd., 100% 330R), material 2 (100% SK370Y + 10% POE), material 3 (100% BN7000-TH20), material 4 (100% BN7000-TH20 + 50% SK370Y), material 5 (15% BN7000-TH20 + 75% SK370Y), material 6 (100% SK370Y) were used as the base material experimental materials of the inner tube 2 and the outer tube 1 respectively;

[0047] Different materials 1 to 6 are respectively injection molded into inner tube 2 and outer tube 1. The matching test is carried out based on whether the inner tube 2 and the outer tube 1 are tightly matched. The compressive force test is carried out using a universal mechanical testing machine. The matching test results are shown in Table 1. The compressive force test results are shown in Table 1. Figure 1 shown.

[0048] Table 1 Test results of matching of inner tube and outer tube of different substrates

[0049]

[0050] It can be seen from Table 1 that when the base material of the outer tube 1 is BN7000-TH20 and the base material of the inner tube 2 is 100% SK370Y+10% POE, the matching of the inner tube 2 and the outer tube 1 is better.

[0051] The present invention uses 100% SK370Y + 10% POE as material A and BN7000-TH20 as material B, and uses them as raw materials to respectively injection mold inner tube 2 (Inner filter tube) and outer tube 1 (sample cup), and then performs compression force test on inner tube 2 and outer tube 1. Figure 1 As shown, when the inner tube 2 and the outer tube 1 are both made of material A, the compression force is 80N; when the inner tube 2 is made of material A and the outer tube 1 is made of material B, the compression force is 40N; when the inner tube 2 is made of material B and the outer tube 1 is made of material A, the compression force is 50N; when the inner tube 2 and the outer tube 1 are both made of material B, the compression force is 70N.

[0052] It can be seen that when material A is inner tube 2 and material B is outer tube 1, its compression force is the smallest; when material B is inner tube 2 and material A is outer tube 1, its compression force is second. Therefore, it is preferred to select material A as inner tube 2 and material B as outer tube 1 for subsequent experimental tests.

[0053] Furthermore, since the filtration compression force of 40N when material A is the inner tube 2 and material B is the outer tube 1 is still too large, the present invention improves the first polypropylene and the second polypropylene by adding different lubricants to change their surface properties.

[0054] Furthermore, the first lubricant is polyoxyethylene, and the second lubricant is stearic acid.

[0055] Furthermore, the filtering sample bottle also includes a pressing ring, which is arranged in the outer tube 1, and the inner tube 2 presses the pressing ring tightly against the bottom of the outer tube 1, and the pressing ring is made of the first polypropylene as raw material (the pressing ring is not shown in the drawings).

[0056] Furthermore, the filtering sample bottle also includes a cover body 3, the inner tube 2 is open at one end away from the outer tube 1, and a filtering hole is provided at one end of the inner tube 2 facing the outer tube 1. The cover body 3 is provided on the opening of the inner tube 2 for opening and closing the opening, and the cover body 3 is manufactured using the first polypropylene as raw material.

[0057] Furthermore, the filtering sample bottle also includes a filter membrane, which is arranged between the pressure ring and the inner filter tube (the filter membrane is not shown in the figure).

[0058] Furthermore, the filtering sample bottle also includes a cap gasket 4, which is arranged between the opening of the inner tube 2 and the cover body 3 for sealing. The cap gasket 4 can be made of conventional materials in the manufacturing process of the filtering sample bottle.

[0059] The present invention also provides a preparation process of a self-lubricating filtering sample bottle, comprising the following steps:

[0060] preparing a first modified polypropylene and a second modified polypropylene;

[0061] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0062] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0063] Assemble the inner and outer tubes into a filtration sample vial.

[0064] Furthermore, the preparation method of the first modified polypropylene is: mixing the first polypropylene, the first lubricant, and the second lubricant in a mass ratio of 100: (10-15): (1-10), extruding and molding, to obtain the first modified polypropylene.

[0065] Furthermore, the preparation method of the second modified polypropylene is: mixing the second polypropylene and the second lubricant in a mass ratio of 100:(1-10), extruding and molding, to obtain the second modified polypropylene.

[0066] Furthermore, the process conditions for extrusion molding in the present application are conventional process conditions and will not be described in detail here.

[0067] The present invention is described in detail below by specific examples. It should also be understood that the following examples are only used to specifically illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific values ​​​​exemplified below.

[0068] Example 1

[0069] The first polypropylene, polyoxyethylene and stearic acid are uniformly mixed in a mass ratio of 100:10:1, and extruded to obtain a first modified polypropylene;

[0070] The second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0071] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0072] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0073] Assemble the inner and outer tubes into a filtration sample vial.

[0074] Example 2

[0075] The difference between this embodiment and embodiment 1 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:5, and extruded to obtain a second modified polypropylene.

[0076] Example 3

[0077] The difference between this embodiment and embodiment 1 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:10, and extruded to obtain a second modified polypropylene.

[0078] Example 4

[0079] The first polypropylene, polyoxyethylene and stearic acid are uniformly mixed in a mass ratio of 100:15:5, and extruded to obtain a first modified polypropylene;

[0080] The second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0081] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0082] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0083] Assemble the inner and outer tubes into a filtration sample vial.

[0084] Example 5

[0085] The difference between this embodiment and embodiment 4 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:5, and extruded to obtain a second modified polypropylene.

[0086] Example 6

[0087] The difference between this embodiment and embodiment 4 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:10, and extruded to obtain a second modified polypropylene.

[0088] Example 7

[0089] The first polypropylene, polyoxyethylene and stearic acid are uniformly mixed in a mass ratio of 100:15:10, and extruded to obtain a first modified polypropylene;

[0090] The second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0091] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0092] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0093] Assemble the inner and outer tubes into a filtration sample vial.

[0094] Example 8

[0095] The difference between this embodiment and embodiment 7 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:5, and extruded to obtain a second modified polypropylene.

[0096] Example 9

[0097] The difference between this embodiment and embodiment 7 is that the second polypropylene and stearic acid are uniformly mixed in a mass ratio of 100:10, and extruded to obtain a second modified polypropylene.

[0098] Comparative Example 1

[0099] The first polypropylene, polyoxyethylene and talcum powder are uniformly mixed in a mass ratio of 100:10:1, and extruded to obtain a first modified polypropylene;

[0100] The second polypropylene and talcum powder are uniformly mixed in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0101] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0102] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0103] Assemble the inner and outer tubes into a filtration sample vial.

[0104] Comparative Example 2

[0105] The difference between this comparative example and comparative example 1 is:

[0106] Using the first modified polypropylene as a raw material, an outer tube is prepared by injection molding;

[0107] The inner tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0108] Assemble the inner and outer tubes into a filtration sample vial.

[0109] Comparative Example 3

[0110] The first polypropylene and liquid paraffin are uniformly mixed in a mass ratio of 100:10, and extruded to obtain a first modified polypropylene;

[0111] The second polypropylene and liquid paraffin are mixed evenly in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0112] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0113] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0114] Assemble the inner and outer tubes into a filtration sample vial.

[0115] Comparative Example 4

[0116] The first polypropylene, polyoxyethylene and oleylamide are uniformly mixed in a mass ratio of 100:5:5, and extruded to obtain a first modified polypropylene;

[0117] The second polypropylene and oleylamide are uniformly mixed in a mass ratio of 100:1, and extruded to obtain a second modified polypropylene;

[0118] Using the first modified polypropylene as a raw material, an inner tube is prepared by injection molding;

[0119] The outer tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0120] Assemble the inner and outer tubes into a filtration sample vial.

[0121] Comparative Example 5

[0122] The difference between this comparative example and Example 4 is that:

[0123] Using the first modified polypropylene as a raw material, an inner tube and an outer tube are prepared by injection molding;

[0124] Assemble the inner and outer tubes into a filtration sample vial.

[0125] Comparative Example 6

[0126] The difference between this comparative example and Example 4 is that:

[0127] Using the first modified polypropylene as a raw material, an outer tube is prepared by injection molding;

[0128] The inner tube is prepared by injection molding using the second modified polypropylene as a raw material;

[0129] Assemble the inner and outer tubes into a filtration sample vial.

[0130] Comparative Example 7

[0131] The difference between this comparative example and Example 4 is that:

[0132] The inner tube and the outer tube are prepared by injection molding using the second modified polypropylene as a raw material;

[0133] Assemble the inner and outer tubes into a filtration sample vial.

[0134] Performance Testing

[0135] Inner tube and outer tube matching test: Examples 1 to 9 and Comparative Examples 1 to 4 were tested for inner tube and outer tube matching, and the test results are shown in Table 2.

[0136] Filtration compression force test: Example 4 and Comparative Examples 5 to 7 were subjected to filtration compression force test. The test results are as follows: Figure 2 shown.

[0137] Table 2 Matching test of inner tube and outer tube of Examples 1 to 9 and Comparative Examples 1 to 4

[0138]

[0139] As can be seen from Table 2, there is no leakage in Examples 1 to 9 and Comparative Example 1, the inner tube and the outer tube have good sealing properties, and no leakage occurs during downward filtering, resulting in ineffective filtration.

[0140] Among them, comparative examples 1 and 2 use talcum powder as the second lubricant. Although it can significantly improve the lubrication performance of the inner tube and the outer tube, after the introduction of talcum powder, talcum powder agglomerates are easily formed inside the filter sample bottle, and the filter sample bottle turns white and its transparency is weakened. Therefore, it is not suitable to use talcum powder as the second lubricant.

[0141] Comparative Example 3 uses liquid paraffin as an oily lubricant, and Comparative Example 4 uses oleamide as an oily lubricant. Even when a larger amount is used, the pressing process is still not smooth.

[0142] The filter sample bottles prepared in Examples 1 to 9 have no whitening phenomenon, no reduction in transparency, and no impact on appearance. In addition, the filter sample bottles prepared in Examples 1 to 9 have good tightness of the inner tube and the outer tube, no leakage, and their lubrication performance is also significantly improved. Among them, Example 4, which uses 100% SK370Y + 15% POE + 5% stearic acid as raw materials for injection molding as the inner tube and 100% BN7000-TH20 + 1% stearic acid as the outer tube, has the best matching, the best self-lubricating performance, and the pressing process is relatively smooth, which can ensure sufficient lubrication and coordination between the inner tube and the outer tube.

[0143] In the present invention, the first modified polypropylene of Example 4 is used as A1 material, and the second modified polypropylene of Example 4 is used as B1 material, and they are respectively injection molded into an inner filter tube (Inner filter tube) and an outer tube (sample cup) using them as raw materials, and the filtration compression force test is performed on Example 4 and Comparative Examples 5-7.

[0144] like Figure 2 As shown, when the inner tube and the outer tube of Comparative Example 5 are both made of A1 material, the compression force is 40N;

[0145] When the A1 material is the inner tube and the B1 material is the outer tube in Example 4, the compression force is 10N;

[0146] When the material B1 is used as the inner tube and the material A1 is used as the outer tube in comparative example 6, the compression force is 30N;

[0147] When the inner tube and the outer tube of Comparative Example 7 are both made of B1 material, the compression force is 30N.

[0148] It can be seen that in Example 4, when material A1 is the inner tube and material B1 is the outer tube, the compression force is significantly reduced, and the compression force is 1 / 4 of the compression force of the filtering sample bottle prepared with unmodified materials A and B.

[0149] Therefore, the preferred embodiment 4 of the present invention is used to prepare a filtering sample bottle. The filtering sample bottle of the present invention can ensure the sealing of the entire product while ensuring sufficient lubrication and matching of the inner tube and the outer tube, and the pressing process is smooth without jamming, and the entire filtering process is safe and relatively easy.

[0150] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A self-lubricating filtering sample bottle, characterized in that: It comprises an outer tube and an inner tube, wherein the inner tube is movably arranged in the outer tube along the axial direction of the outer tube; The inner tube is manufactured using the first modified polypropylene as a raw material, and the outer tube is manufactured using the second modified polypropylene as a raw material; The first modified polypropylene includes 100 parts of first polypropylene, 10-15 parts of first lubricant, and 1-10 parts of second lubricant in parts by mass; The second modified polypropylene includes 100 parts of a second polypropylene and 1 to 10 parts of a second lubricant in parts by mass; The first polypropylene is SK370Y produced by SK energy, the second polypropylene is BN7000-TH20 produced by Guangdong Haina Plastic Technology Co., Ltd., the melt flow rate of the first polypropylene is greater than the melt flow rate of the second polypropylene, and the rigidity of the first polypropylene is greater than the rigidity of the second polypropylene; the first lubricant is polyoxyethylene, and the second lubricant is stearic acid.

2. The self-lubricating filtering sample bottle according to claim 1, characterized in that: The filtering sample bottle also includes a pressing ring, which is arranged in the outer tube. The inner tube presses the pressing ring tightly against the bottom of the outer tube. The pressing ring is manufactured using the first polypropylene as raw material.

3. The self-lubricating filtering sample bottle according to claim 1, characterized in that: The filtering sample bottle further comprises a cover body. The inner tube has an opening at one end away from the outer tube. The cover body is arranged on the opening of the inner tube. The cover body is manufactured using the first polypropylene as a raw material.

4. A preparation process of a self-lubricating filtering sample bottle, characterized in that: The following steps are involved: preparing a first modified polypropylene and a second modified polypropylene; The preparation method of the first modified polypropylene is: mixing the first polypropylene, the first lubricant and the second lubricant in a mass ratio of 100: (10-15): (1-10), extruding and molding, to obtain the first modified polypropylene; The preparation method of the second modified polypropylene is: mixing the second polypropylene and the second lubricant in a mass ratio of 100:(1-10), extruding and molding, to obtain the second modified polypropylene; The first polypropylene is SK370Y produced by SK energy, the second polypropylene is BN7000-TH20 produced by Guangdong Haina Plastic Technology Co., Ltd., the melt flow rate of the first polypropylene is greater than the melt flow rate of the second polypropylene, and the rigidity of the first polypropylene is greater than the rigidity of the second polypropylene; the first lubricant is polyoxyethylene, and the second lubricant is stearic acid; Using the first modified polypropylene as a raw material, preparing an inner tube by injection molding; Using the second modified polypropylene as a raw material, preparing an outer tube by injection molding; The inner tube and the outer tube are assembled into the filtering sample bottle.

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