The physical properties and usage of natural springs

Physical properties:

( A) Concentration

the concentration of the latex with total solid content and dry rubber content. Dry rubber content refers to the dry rubber content in latex, total solid content is refers to remove water and volatile constituents in latex after all the content of solid matter, expressed in percentage. Total solid content and the dry rubber content generally there is a difference, this value is called total dry, to illustrate involatile of rubber component content in latex. These indicators to guide the production and product quality has important significance.

fresh latex concentration varies with the type of tree age, season, tapping system differences, average 20% 40% of the total solid content.

（ 2) Relative density

the relative density of fresh latex about 0. 96 - 0. 98, it is made of whey relative density ( 1. 02) And the relative density of rubber hydrocarbon ( 0. 9064). Decision, from the relative density can approximate measure of rubber hydrocarbon content in latex. The content is higher, latex rubber hydrocarbon relative density is small, as shown in table.

（ 3) Viscosity

total solid content in about 35% of the fresh latex viscosity about 12 - 15 mpa· S, with the collection period, and other factors and has great changes. General total solid content high viscosity is high, but the same total solid content of latex, as the method of preservation, storage time, particle size, and so on different, viscosity relative difference will happen.

（ 4) Surface tension

surface tension shows that the size of the latex were distributed evenly over a solid surface - performance - - - - - - - The stand or fall of so-called wetting performance. Rubber is insoluble in water, but contains a lot of latex can reduce the surface tension of water surface active substances, such as protein, fatty acids, they can reduce the surface tension of latex. Such as the total solid content is 38% ~ 40% of the latex, the surface tension of about 38 ~ 40 mn/m, far more than water ( 72mN/m） Low, and thus of the hydrophilic surface such as cloth, leather and other wetting and penetration ability can often have increased, as to reduce the surface tension of the production when latex still cannot satisfy the technological requirements, need to add some surfactants, to further improve the surface performance, increase the wettability.

（ 5) PH

latex PH has a great influence on its stability. Fresh latex is neutral and slightly alkaline, PH value of 7 to 7. 2. After hours to more than ten hours, because of the influence of bacteria and enzymes in latex can reduce and becomes acidic PH value, so that the cause of solidification. Therefore, often adding ammonia or other alkali, make the PH up to 10 ~ 10. 5, in order to can save over a long period of time.

application:

it is mainly used for: (latex impregnated products Holiday, toys) The balloon, Medical, household, industrial) Gloves, pacifiers, condom;

sponge products: sponge ( Mattresses, pillows, shoes material in the bottom cushion) ；

injection molding products: latex toys, gas masks, toiletries, shoes;

molding products: rubber spring wire, medical supplies;

: (other applications Hair, brown, animals and plants and the synthetic fiber, artificial leather) Glue, flocking, nonwoven fabric, carpet, textile, papermaking, and adhesive, etc.