Preparation method of carbon black dispersity sample

Abstract

The invention provides a preparation method of a carbon black dispersity sample, and solves the problems of low efficiency caused by long freezing treatment and unfreezing periods of a traditional preparation method of the carbon black dispersity sample; water mist is easily formed on the unfrozen surface, so that a test result is influenced; the technical problems that the hardness of a frozen rubber sheet is increased, so that cutting becomes difficult, the requirement for the sharp degree of a cutting knife is high, the cutting knife is frequently replaced, and the section may be unsmooth, so that the testing accuracy of the carbon black dispersity is affected are solved, and the method can be widely applied to the field of rubber detection. The method specifically comprises the following steps: cutting raw rubber into rubber sheets by using a cutter; putting the film into a forming mold; putting the forming mold into a vulcanizing machine for vulcanizing; cutting the vulcanized rubber sheet again by using a cutting knife, and detecting the carbon black dispersity of the cut surface which is cut again; in the vulcanization process, the vulcanization pressure is not lower than 3.5 MPa, and continuous vulcanization is performed at the temperature of 145 DEG C for 40 minutes.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber detection, and particularly relates to a method for preparing a carbon black dispersion sample. Background Art

[0002] The traditional method of preparing carbon black dispersion samples usually involves freezing the rubber test piece after mixing carbon black with rubber, then thawing and slicing. This method has the following problems: the freezing and thawing cycle is long, resulting in low efficiency; water mist is easily formed on the surface after thawing, affecting the test results; the hardness of the frozen film increases, making cutting difficult, requiring high sharpness of the cutter, frequent replacement of the cutter, and the cut surface may not be smooth, thus affecting the test accuracy of carbon black dispersion. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and provide a method for preparing a carbon black dispersion sample.

[0004] To this end, the present invention provides a method for preparing a carbon black dispersion sample, comprising the following steps:

[0005] S10: Use a cutter to cut the original rubber into films;

[0006] S20: placing the film into a molding mold;

[0007] S30: placing the molding mold into a vulcanizing machine for vulcanization;

[0008] S40: After the vulcanized film is cut again with a cutter, the carbon black dispersion is tested on the cut surface.

[0009] Furthermore, during the vulcanization process, the vulcanization pressure is not less than 3.5 MPa, and the vulcanization is continued at a temperature of 145° C. for 40 minutes.

[0010] Furthermore, a flat plate vulcanizing press is used during vulcanization.

[0011] Furthermore, the molding die comprises an upper clamping plate and a lower clamping plate, a molding plate is clamped between the upper clamping plate and the lower clamping plate, a receiving groove is provided on the molding plate, and a connected overflowing glue groove is also provided around the receiving groove.

[0012] Furthermore, the shape of the containing tank is adapted to the size requirement of carbon black dispersion detection.

[0013] Furthermore, the molding die is made of metal material.

[0014] The present invention provides a method for preparing a carbon black dispersion sample, which has the following beneficial effects:

[0015] 1. The sample prepared by this method is easier to cut and has a smooth cut surface, which effectively improves the detection accuracy of carbon black dispersion;

[0016] 2. It eliminates the freezing and thawing process, thus improving the preparation efficiency;

[0017] 3. It avoids the difficulty of cutting and the high requirement of the sharpness of the cutting knife caused by the increase of the hardness of the film after freezing in the traditional method;

[0018] 4. Reduce the need for frequent replacement of cutting knives and reduce costs;

[0019] 5. The sample prepared by this method has a smooth cross section, which avoids the test accuracy of carbon black dispersion being affected by uneven cross section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the forming die of the present invention;

[0021] Figure 2 This is a diagram of the internal structure of the lower clamping plate of the molding die of the present invention;

[0022] Markings in the figure: 1. Upper splint; 2. Lower splint; 3. Receiving groove; 4. Overflow groove; 5. Handle; 6. Forming plate. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0024] The present invention provides a method for preparing a carbon black dispersion sample, comprising the following steps:

[0025] Use a dynamic die rheometer volume sampling knife of model R-VS 3000 to cut the original rubber into sample films that match the size of the receiving groove 3 of the molding mold, then place them in the receiving groove 3, put them into a flat vulcanizer, and vulcanize them for 40 minutes at a vulcanization pressure of not less than 3.5 MPa and a temperature of 145°C.

[0026] The vulcanized sample film is cut with a sampling cutter so that the cross section of the sample film meets the carbon black dispersion test requirements, and the carbon black dispersion test is performed on the cross section of the sample film.

[0027] After vulcanization, the cross section of the sample film is closer to the actual state of the film itself, and the test results are more accurate when checking the carbon black dispersion. The following is a parameter comparison table of the two sample preparation methods.

[0028]

[0029] It should be noted that, in the present invention, the raw rubber is not processed after the first equal volume cutting, while other raw rubber samples are cut after sheeting on an open mixer. The samples are processed again, resulting in the test data being unable to reflect the dispersion of the raw rubber state.

[0030] The molding die is made of stainless steel. Figure 1 , as shown in FIG. 2 , the molding die includes an upper clamping plate 1 and a lower clamping plate 2, a molding plate 6 is sandwiched between the upper clamping plate 1 and the lower clamping plate 2, and a receiving groove 3 is provided on the molding plate 6, and the shape of the receiving groove 3 is adapted to the size requirements of the carbon black dispersion test. A connected overflowing glue groove 4 is also provided around the receiving groove 3, and the overflowing glue groove 4 can provide an external overflow channel for the overflowing glue phenomenon generated by the sample film during the vulcanization process, so as to ensure that the overall shape of the sample film in the receiving groove 3 does not change much. Handles 5 are also fixedly connected to both sides of the lower clamping plate 2 for moving the molding die.

[0031] The molding die has the following advantages: the size and shape are adapted to the preparation requirements of the carbon black dispersion sample; the material selection has good thermal stability and mechanical strength.

[0032] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A method for preparing a carbon black dispersion sample, characterized in that: The following steps are involved: S10: Use a cutter to cut the original rubber into films; S20: placing the film into a molding mold; S30: placing the molding mold into a vulcanizing machine for vulcanization; S40: After the vulcanized film is cut again with a cutter, the carbon black dispersion is tested on the cut surface.

2. A method for preparing a carbon black dispersion sample according to claim 1, characterized in that: During the vulcanization process, the vulcanization pressure is not less than 3.5 MPa, and the vulcanization is continued at a temperature of 145°C for 40 minutes.

3. A method for preparing a carbon black dispersion sample according to claim 2, characterized in that: A flat vulcanizing press is used for vulcanization.

4. A method for preparing a carbon black dispersion sample according to any one of claims 1 to 3, characterized in that: The forming mold comprises an upper clamping plate and a lower clamping plate, a forming plate is clamped between the upper clamping plate and the lower clamping plate, a receiving groove is provided on the forming plate, and a connected overflowing glue groove is also provided around the receiving groove.

5. A method for preparing a carbon black dispersion sample according to claim 4, characterized in that: The shape of the containing tank is adapted to the size requirements of the carbon black dispersion test.

6. A method for preparing a carbon black dispersion sample according to claim 4, characterized in that: The molding die is made of metal material.

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