Natural liquid rubber slurry with added carbon nanotube and its prepn process

A technology of natural rubber and natural latex, which is applied in the field of natural rubber liquid slurry with carbon nanotubes added and its preparation, can solve the problems of not finding natural rubber liquid slurry, etc., and achieve the effect of performance improvement

Inactive Publication Date: 2005-09-28
TSINGHUA UNIV
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  • Natural liquid rubber slurry with added carbon nanotube and its prepn process
  • Natural liquid rubber slurry with added carbon nanotube and its prepn process

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preparation example Construction

[0031] 2. Preparation of carbon nanotube suspension

[0032] Adding dispersant is an effective way to further improve the suspension effect of CNTs in natural rubber latex and promote the dispersion of CNTs. Sodium dodecylbenzenesulfonate (SDAS) is a commonly used anionic surfactant. Too much dispersant is unfavorable to the performance of powder rubber. When the mass ratio of dispersant to CNTs is 5% to 20%, the obtained The CNTs suspension has good stability.

[0033] 3. Adjust the pH value of carbon tube suspension

[0034] During the mixing process of CNTs-water suspension and natural latex, flocculation is easy to occur, and the main reason is that the ζ potential of latex decreases due to the addition of CNTs suspension. When the zeta potential drops to a certain critical value, the electrostatic repulsion between the latex particles is not enough to offset the attractive force between the particles, the balance between the latex particles is broken, and the latex part...

Embodiment 1

[0039] Place the CNTs at a volume ratio of V 硫酸 :V 硝酸 = In the mixed acid solution of 3:1, 1g of CNTs corresponds to 10ml of acid solution, boiled for 30min, washed and dried to obtain acid boiled CNTs. Take 30 g of acid boiled CNTs and 3 g of sodium dodecylbenzenesulfonate (SDAS), add them to deionized water with a mass ratio of CNTs of 10:1, and ultrasonically disperse to obtain a CNTs-water suspension. KOH was added to the suspension to bring the pH of the suspension to 10. Get solid content and be 60% natural rubber latex 100g, this suspension is joined in the natural rubber latex, add appropriate amount of deionized water to make its total solid content be 10%, and adopt magnetic stirrer through fully stirring more than 2 hours, make it Mix evenly to prepare a natural rubber liquid slurry with a CNTs content of 50 phr (that is, the mass ratio of CNTs to natural latex dry rubber is 50%).

[0040] The CNTs and the CNTs that have not been acid-cooked are observed under a ...

Embodiment 2

[0042]Take 3 g of acid-cooked CNTs and 0.3 g of sodium dodecylsulfonate, add them into deionized water with a mass ratio of CNTs of 10:1, and disperse by ultrasonic to obtain a CNTs-water suspension. Ammonia water was added to the suspension to bring the pH value of the suspension to 10.5. Get 25g of natural latex with a solid content of 60%, add this suspension to the natural latex, add an appropriate amount of deionized water to make the total solid content 10%, and use a magnetic stirrer to fully stir for more than 2 hours to make it Mix evenly to prepare a natural rubber latex suspension with a CNTs content of 20phr. The prepared powder rubber was observed by SEM, and the dispersion state of CNTs in it was good.

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Abstract

The present invention relates to composite polymer material performance improving technology. The liquid natural rubber slurry contains natural latex and carbon nanotube (CNT) and has total solid content of natural latex and CNT in 5-30 % and weight ratio between CNT and dry natural latex of 1-50 %. The liquid natural rubber slurry is prepared through surface treatment of CNT for hydrophilicity; mixing with dispersant and deionized water to obtain water suspension of CNT; regulating the pH value of the suspension to 9-12; and finally mixing with natural latex to obtain the liquid natural rubber slurry with added CNT. The liquid natural rubber slurry with homogeneously dispersed CNT is used in preparing CNT modified rubber powder and CNT modified sulfurized rubber products with greatly raised mechanical, electrically conducting, heat conducting, antistatic and other performance.

Description

Technical field: [0001] Natural rubber liquid slurry added with carbon nanotubes and preparation method thereof relate to performance improvement of polymer composite materials such as rubber [0002] technology field. Background technique: [0003] Since CNTs (carbon nanotubes) were first discovered by Japanese scholar Iijima in 1991, due to their unique structure and excellent physical properties, their application research in engineering materials has quickly become a hotspot. Among them, in the field of composite materials, CNTs have been It is widely used in the modification of composite materials. However, the application research of CNTs in the modification of natural rubber and the preparation of modified powder rubber has not been reported. [0004] Natural rubber liquid slurry is one of the important raw materials for preparing powder rubber and other composite materials. For example, the natural rubber liquid slurry can be prepared into powder rubber by spray dry...

Claims

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Application Information

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IPC IPC(8): C08K3/04C08L7/00
Inventor 朱跃峰梁吉王敬东周湘文
Owner TSINGHUA UNIV
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