A detection method for the amount of adhesive attached to aramid polyester blended cord fabric

Abstract

The present application relates to tire manufacturing analysis chemistry technical field, specifically, it is a kind of aramid polyester blended cord rubber content detection method.A kind of aramid polyester blended cord rubber content detection method, take quantitative cord sample, mass is m, by solvent A processing, after processing, by G2 sand core crucible filtration, the mass m1 of G2 sand core crucible, aramid and rubber after dissolving polyester is obtained;Again by solvent B processing, after processing, by the same G2 sand core crucible filtration, the mass m2 of G2 sand core crucible and aramid after dissolving rubber is obtained, thereby the rubber content is calculated by formula.The beneficial effects of the present application are: the present application provides a kind of aramid polyester blended cord rubber content detection method, relative average deviation≤0.5%, in specified range, repeatability, good accuracy, and absolute error is small, accuracy is high, suitable for detecting the rubber content of aramid polyester blended cord.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tire manufacturing analysis chemistry, in particular to a detection method for the rubber coating amount of aramid polyester blended cord fabric. BACKGROUND

[0002] With the continuous development of the tire industry, the comprehensive performance requirements for tires are becoming higher and higher, and thus higher requirements are put forward for the framework materials. Aramid fiber, as a high-performance fiber, has excellent strength, good heat resistance, and excellent flame retardance. Polyester cord fabric has excellent heat resistance and obvious price advantage. At present, aramid and nylon or polyester blended fiber are used as the framework material of tires in the tire industry.

[0003] The rubber coating amount is one of the important indicators for testing the adhesion of rubber and cord fabric. When the rubber coating amount reaches a certain value, the adhesion will no longer increase with the increase of the rubber coating amount; too high rubber coating amount will make the cord fabric hard, affect the fatigue resistance, and increase the cost; and too low rubber coating amount will cause peeling, delamination, and bubbles in the tire, so the control of the rubber coating amount of the cord fabric directly affects the safety of the tire in use.

[0004] Chinese invention patent (publication number: CN113670966A, publication date: 2021-11-19) discloses a nylon 66 impregnated cord fabric rubber coating amount test method, which includes the following steps: cutting the nylon 66 impregnated cord fabric into 5mm long test samples, drying at 105℃ for 1h; cooling the test samples in the drying chamber at room temperature for 30min; weighing 3.0000±0.003g of the dried and cooled test samples; using nuclear magnetic resonance method, setting the test parameters according to the relaxation time of the glue signal, testing the signal quality ratio of each test sample; establishing a working curve between the gradient rubber coating amount of the test samples and the signal quality ratio for quantitative analysis. However, this method needs to use a nuclear magnetic resonance fiber oil content analyzer, and the relative weight method detection has higher equipment requirements. SUMMARY

[0005] The present application provides a detection method for the rubber coating amount of aramid polyester blended cord fabric, which has a relative average deviation of ≤0.5%, good repeatability and accuracy within the specified range, small absolute error, high accuracy, and is suitable for detecting the rubber coating amount of aramid polyester blended cord fabric.

[0006] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0007] A detection method of the glue amount of aramid polyester blended cord fabric, taking a quantitative cord fabric sample with a mass of m, treating through solvent A, after treatment, filtering through a G2 sand core crucible, weighing to obtain the mass m1 of the G2 sand core crucible, aramid and glue after dissolving the polyester; treating through solvent B, after treatment, filtering through the same G2 sand core crucible, weighing to obtain the mass m2 of the G2 sand core crucible and aramid after dissolving the glue, thereby calculating the glue amount through a formula;

[0008] The solvent A is a trichloroacetic acid solution, and the mass-volume ratio of trichloroacetic acid to dichloromethane is 1:2-4 (g / ml);

[0009] The solvent B solute is a 5-10% performic acid solution;

[0010] The formula is as follows:

[0011] G= (m1- m2) / [m- (m1- m2)] x 100%

[0012] Wherein, G is the glue amount (%), m is the mass of the sample, m1 is the mass (g) of the G2 sand core crucible, aramid and glue, and m2 is the mass of the G2 sand core crucible and aramid.

[0013] As preferred, the solvent A is a trichloroacetic acid solution, and the mass-volume ratio of trichloroacetic acid to dichloromethane is 3:10 (g / ml); the solvent B solute is a 7% performic acid solution.

[0014] As preferred, the preparation method of the solvent B is: slowly adding 30% hydrogen peroxide into 98% formic acid, and the volume ratio of hydrogen peroxide to formic acid is 47.7:250.

[0015] As preferred, the specific steps of the determination method are as follows:

[0016] 1) Sample weighing: weighing the cord fabric sample in an oven at 150±2℃ to constant weight, taking the sample mass as m, and putting two portions into beakers; at the same time, weighing the G2 sand core crucible dried to constant weight and cooled;

[0017] 2) Dissolving polyester: slowly pouring the solvent A into the sample beaker, putting in a rotor, stirring through a magnetic stirrer, taking out the beaker after the sample is completely dissolved, taking out the rotor and rinsing with the solvent A;

[0018] 3) Filtering: transferring the dissolved sample solution along the glass rod to the G2 sand core crucible, rinsing the beaker, glass rod and crucible with the solvent A, finally rinsing with distilled water until neutral, and drying;

[0019] 4) Weighing: Put the G2 sand core crucible with residues into an oven at 105±2℃ to constant weight, take out and cool to room temperature in a desiccator, weigh, get the mass m1 of G2 sand core crucible, aramid and adhesive after dissolving polyester;

[0020] 5) Dissolving adhesive: Transfer the residues in G2 sand core crucible to a beaker, slowly pour solvent B into it, cover with a watch glass, put into a water bath at 45℃, dissolve the adhesive;

[0021] 6) Filtering: Filter the solution, immerse the sample in solvent B, stir with a glass rod for at least 1 min, slowly transfer to the same G2 sand core crucible for filtering, filter the solution, rinse the beaker, glass rod and residues on the crucible with solvent B, finally rinse with distilled water until neutral, and dry;

[0022] 7) Weighing: Put the G2 sand core crucible with residues into an oven at 105±2℃ to constant weight, take out and cool to room temperature in a desiccator, weigh, get the mass m2 of G2 sand core crucible and aramid after dissolving adhesive;

[0023] 8) Calculating adhesive amount: Calculate the adhesive amount of two samples by formula and express the adhesive amount of the screen cloth as an arithmetic mean.

[0024] As preferred, the sample mass in step (1) is 2g, accurate to 0.1mg.

[0025] As preferred, the amount of solvent A used in step (2) is 75ml, and the magnetic stirring time is 20-30min.

[0026] As preferred, the amount of solvent B used in step (5) is 50ml, and the water bath time is 2h.

[0027] As preferred, in steps (3) and (6), the amount of solvent A and solvent B used for rinsing is 50ml, and the rinsing is performed in 2-3 times.

[0028] The present application has the following beneficial effects: the present application provides a detection method for the adhesive amount of aramid polyester blended screen cloth, the relative average deviation is ≤0.5%, within the specified range, the repeatability and accuracy are good, the absolute error is small, the accuracy is high, and it is suitable for detecting the adhesive amount of aramid polyester blended screen cloth. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a state diagram of adhesive and aramid after dissolving polyester.

[0030] Figure 2 It is a state diagram of aramid after dissolving adhesive. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] Embodiment 1

[0033] Solvent preparation:

[0034] Solvent A: 300 g of trichloroacetic acid is dissolved in 1000 ml of dichloromethane.

[0035] Solvent B: 7% of performic acid, 47.7 ml of 30% hydrogen peroxide is slowly added to 250 ml of 98% formic acid, and it is prepared and used immediately.

[0036] The specific steps of the determination method are as follows:

[0037] 1) Sample weighing: cut the curtain cloth sample into 3 mm long fragments, put them into a constant weight weighing box (aluminum) and bake in an oven at 150±2℃ until constant weight, weigh the sample mass m, and put it into a beaker; at the same time, weigh the G2 sand core crucible which is baked to constant weight and cooled;

[0038] 2) Dissolve polyester: slowly pour solvent A into the sample beaker, put it into a rotor, stir by a magnetic stirrer, take out the beaker after the sample is completely dissolved, take out the rotor and rinse with solvent A;

[0039] 3) Filtration: transfer the dissolved sample solution along the glass rod to the G2 sand core crucible for filtration, rinse the beaker, glass rod and residue on the crucible with solvent A, and finally rinse with distilled water until neutral, and dry;

[0040] 4) Weighing: put the G2 sand core crucible with residue into an oven at 105±2℃ and bake to constant weight, take it out and cool to room temperature in a desiccator, weigh, and get the mass m1 of the G2 sand core crucible, aramid and attached glue after dissolving polyester;

[0041] 5) Dissolve attached glue: transfer the residue in the G2 sand core crucible to the beaker, slowly pour solvent B into it, cover with a watch glass, and put it into a 45℃ water bath to dissolve the attached glue;

[0042] 6) Filtration: filter out the solution, immerse the sample in solvent B, stir with a glass rod for at least 1 min, slowly transfer to the same G2 sand core crucible for filtration, filter out the solution, rinse the beaker, glass rod and residue on the crucible with solvent B, and finally rinse with distilled water until neutral, and dry;

[0043] 7) Weighing: the G2 sand core crucible filtered with residues is placed in an oven at 105±2 DEG C to constant weight, taken out and placed in a desiccator to cool to room temperature, weighed to obtain the mass m2 of the G2 sand core crucible and aramid after dissolution and glueing;

[0044] 8) Calculate the glueing amount: calculate by the formula: G= (m1-m2) / [m-(m1-m2)]x100%

[0045] Wherein, G is the glueing amount (%), m is the mass of the sample, m1 is the mass (g) of the G2 sand core crucible, aramid and glueing, and m2 is the mass of the G2 sand core crucible and aramid.

[0046] Example 1 determination of the effect

[0047] Table 1 8 detection experiment data summary

[0048]

[0049] The maximum allowable relative average deviation of gravimetric method is ≤0.5%, the relative average deviation obtained by the detection method of the present application is 0.39%, which is within the specified range, indicating that the repeatability and accuracy of the detection method are good, and the absolute error is small, indicating that the accuracy is high. Therefore, the detection method of the present application can be used to detect the glueing amount of aramid polyester blended cord fabric.

[0050] The above is the description of the embodiments of the present application, through the above description of the disclosed embodiments, the person skilled in the art can realize or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting the amount of adhesive applied to aramid-polyester blended tire cord fabric, characterized in that, Take a quantitative sample of tire cord fabric with a mass of m, treat it with solvent A, filter it through a G2 sand core crucible after treatment, and weigh it to obtain the mass m1 of the G2 sand core crucible, aramid, and adhesive after dissolving the polyester; then treat it with solvent B, filter it through the same G2 sand core crucible after treatment, and weigh it to obtain the mass m2 of the G2 sand core crucible and aramid after dissolving the adhesive. The amount of adhesive can then be calculated using a formula. The formula is as follows: G=(m1- m2) / [m-(m1- m2)]×100% Where G is the amount of adhesive (%), m is the mass of the sample, m1 is the mass (g) of the G2 sand core crucible, aramid and adhesive, and m2 is the mass of the G2 sand core crucible and aramid. Solvent A is a trichloroacetic acid solution, with a mass-to-volume ratio of trichloroacetic acid to dichloromethane of 3:10 (g / ml); Solvent B is a 7% formic acid solution; Solvent B is prepared by slowly adding 30% hydrogen peroxide to 98% formic acid, with a volume ratio of hydrogen peroxide to formic acid of 47.7:

250.

2. The method for detecting the adhesive content of aramid-polyester blended tire cord fabric according to claim 1, characterized in that, The specific steps of the determination method are as follows: Step (1) Weighing: Dry the curtain fabric sample in an oven at 150±2℃ until constant weight, weigh the sample mass as m, and put the two portions into beakers respectively; at the same time, weigh the G2 sand core crucible that has been dried to constant weight and cooled. Step (2) Dissolving polyester: Slowly pour solvent A into the sample beaker, place the rotor in, and stir with a magnetic stirrer. After the sample is completely dissolved, remove the beaker, take out the rotor, and rinse with solvent A. Step (3) Filtration: Transfer the dissolved sample solution along the glass rod to the G2 sand core crucible for filtration, then rinse the beaker, glass rod and crucible with solvent A to remove residue, and finally rinse with distilled water until neutral and dry. Step (4) Weighing: Place the G2 sand core crucible with residue in an oven at 105±2℃ and dry it to constant weight. Take it out and place it in a desiccator to cool to room temperature. Weigh it to obtain the mass m1 of the G2 sand core crucible, aramid and adhesive after dissolving polyester. Step (5) Dissolving the adhesive: Transfer the residue in the G2 sand core crucible to a beaker, slowly pour in solvent B, cover with a watch glass, and place in a 45°C water bath to dissolve the adhesive; Step (6) Filtration: Filter out the solution, immerse the sample in solvent B, stir with a glass rod for at least 1 minute, slowly transfer to the same G2 sand core crucible for filtration, filter out the solution, rinse the beaker, glass rod and crucible with solvent B to remove the residue, and finally rinse with distilled water until neutral and dry. Step (7) Weighing: Place the G2 sand core crucible with residue in an oven at 105±2℃ and dry it to constant weight. Take it out and place it in a desiccator to cool to room temperature. Weigh it to obtain the mass m2 of the G2 sand core crucible and aramid after dissolving the adhesive. Step (8) Calculate the amount of adhesive: Calculate the amount of adhesive on the two samples using the formula and express the amount of adhesive on the curtain fabric as the arithmetic mean.

3. The method for detecting the adhesive content of aramid-polyester blended tire cord fabric according to claim 2, characterized in that, In step (1), the sample mass is 2g, accurate to 0.1mg.

4. The method for detecting the amount of adhesive applied to aramid-polyester blended tire cord fabric according to claim 2, characterized in that, In step (2), the amount of solvent A used is 75 ml, and the magnetic stirring time is 20 min-30 min.

5. The method for detecting the adhesive content of aramid-polyester blended tire cord fabric according to claim 2, characterized in that, In step (5), the amount of solvent B used is 50 ml, and the water bath time is 2 h.

6. The method for detecting the adhesive content of aramid-polyester blended tire cord fabric according to claim 2, characterized in that, In steps (3) and (6), the amount of solvent A and solvent B used for rinsing is 50 ml, and the rinsing is performed 2 to 3 times.

Images