Processing method of natural rubber latex using creaming

A processing method of a natural rubber latex using creaming, comprising the following steps:

• step 1):
• adding a surfactant, a pH adjuster, and deionized water to the natural rubber latex to obtain a first resulting mixture, and thoroughly stirring the first resulting mixture at predetermined temperature to form a latex system;
• step 2):
• adding a preservative and a creaming agent to the natural rubber latex or the latex system obtained in step 1) to obtain a second resulting mixture and thoroughly stirring the second resulting mixture;
• standing the second resulting mixture at the predetermined temperature until a first phase separation occurs;
• and collecting a first upper rubber latex phase and a first lower skim latex phase, separately;
• step 3):
• diluting the first upper rubber latex phase obtained in step 2) with deionized water;
• adding the preservative, the pH adjuster, the surfactant, and the creaming agent to obtain a third resulting mixture, and thoroughly stirring the third resulting mixture;
• standing the third resulting mixture at the predetermined temperature until a second phase separation occurs;
• collecting a second upper rubber latex phase and a second lower skim latex phase;
• and repeating the above steps many times;
• wherein, the more the repeat times, the purer a first rubber latex;
• and
• step 4):
• selecting one of the first lower skim latex phase and the second lower skim latex phase or combining the first lower skim latex phase and the second lower skim latex phase to obtain a resulting solution, and concentrating the resulting solution by centrifugation or directly diluting the resulting solution with deionized water;
• adding the preservative, the pH adjuster, the surfactant and the creaming agent to obtain a fourth resulting mixture, and thoroughly stirring the fourth resulting mixture;
• standing the fourth resulting mixture at the predetermined temperature until a third phase separation occurs;
• collecting a third upper rubber latex phase;
• and repeating the above steps many times;
• wherein, the more the repeat times, the purer a second rubber latex.