Process for preparing rubber and clay nano composites by using pre-expanded organic clay
A nanocomposite material and organoclay technology, which is applied in the field of preparation of rubber and clay nanocomposite materials, can solve the problems of inability to prepare butyl rubber, difficult to find solvents, complicated processing procedures, etc., and achieves long preparation cycle, low price, and satisfactory Effects of performance requirements
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Embodiment 1
[0057] Mix organoclay (organosodium-based bentonite) and oleic acid in a mass ratio of 1:1, stir on a mixer for 30 minutes to obtain pre-expanded organoclay, and mill 100 parts of butyl rubber and 5 parts of pre-expanded organoclay in a double-roller Mix on the machine for about 30 minutes, then add the following ingredients in three steps, the first step is to add 5 parts of zinc oxide, 2 parts of stearic acid, and the second step is to add 2-mercaptobenzothiazole (accelerator M) 0.5 parts, 1.0 parts of tetramethylthiuram disulfide (accelerator TMTD), 1.0 parts of N-phenyl-α-naphthylamine (anti-aging agent A), 1.8 parts of sulfur are added in the third step, and after mixing for 20 minutes The rubber material is rolled down to obtain the nano-composite material of butyl rubber and clay. Then measure its positive vulcanization time (T90) at 160°C, vulcanize on a flat vulcanizing machine according to the positive vulcanization time, and prepare samples. Transmission electron m...
Embodiment 2
[0061] The organic solvent was changed to toluene, and the remaining operation steps were the same as in Example 1 to obtain a butyl rubber / clay nanocomposite material. The mechanical properties of the material are listed in Table 1, the transmission electron microscope photo TEM (such as figure 2 shown), X-ray diffraction pattern (XRD) (as Figure 6 shown). From figure 2 It can be seen from the TEM photos that the pre-expanded organoclay treated with toluene has a finer dispersion structure of nanocomposites, indicating that the organoclay has good dispersion in toluene, which is conducive to the insertion of rubber macromolecular chains and the formation of It is an intercalated butyl rubber / clay nanocomposite material. Figure 6 The interlayer spacing of the pre-expanded organoclay corresponding to curve 1 increased from 4.2nm to 5.1nm, and the peak value of the nanocomposite material corresponding to curve 2 was 6.5nm, indicating that the rubber macromolecular chains ...
Embodiment 3
[0063] The organic solvent was changed to n-butanol, and the remaining operation steps were the same as in Example 1 to obtain a butyl rubber / clay nanocomposite material. The mechanical properties of the materials are listed in Table 1, and the transmission electron microscope photos TEM are as follows: image 3 , as shown in the X-ray diffraction pattern (XRD) as Figure 7 shown. From image 3 It can be seen from the TEM photo that the dispersed phase structure of the butyl rubber / clay nanocomposite prepared with n-butanol-treated pre-expanded organoclay is an exfoliated structure, indicating that the organoclay has been exfoliated into a monolithic layer in n-butanol . Thus, pre-swelled organoclays treated with n-butanol resulted in exfoliated nanocomposites.
[0064]As can be seen from Table 1, the butyl rubber / clay nanocomposite prepared by the pre-expanded organoclay processed with n-butanol in the present invention has hardness, 100% modulus, 300% modulus, and tensil...
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Abstract
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