JPH0380801B2 - - Google Patents

Description

[Detailed description of the invention]

<Technical Field> The present invention relates to a useful powdered non-rubber component obtained from serum produced as a by-product during the production of natural rubber. <Prior Art> A wide variety of rubber-containing plants have been discovered, but the one currently cultivated as an industrial raw material is Hevea brasiliensis, which is called the rubber tree. The white emulsion (called latex) obtained from rubber trees has a composition of about 35wt% rubber content (rubber hydrocarbons), about 5wt% non-rubber content consisting of proteins, fatty acids, sugars, etc., and the rest is water. It is. These components form a hydrophobic colloidal sol with water as a dispersion medium and rubber hydrocarbon as a dispersed phase. Generally, in order to produce natural rubber such as RSS (ribbed smoked sheet) and brown crepe, latex is diluted with water, dirt is removed, and then
Formic acid, acetic acid, sulfuric acid, etc. are added as a coagulant to coagulate the rubber, the serum is squeezed out and removed, dehydrated and dried, and processes such as smoking are performed to prevent the rubber from deteriorating due to microorganisms. In the natural rubber manufacturing process, the remaining liquid after removing the coagulated rubber is an aqueous solution called serum, which is traditionally discarded as is, and the proteins, carbohydrates, etc. contained in it are often discarded. There was a problem of environmental pollution due to the decomposition of non-rubber components. There is a method of treating the serum in a septic tank, but it is very expensive, emits a strong putrid odor, and poses a pollution problem.
The effect is not increasing. Furthermore, if this serum could be used as an industrially useful substance, it would improve the efficiency of the rubber industry and be effective in saving resources, but such a substance has not yet been produced. <Object of the invention> The object of the invention is to provide an industrially useful substance obtained from natural rubber latex serum. <Structure of the Invention> The first invention is to spray-dry the remaining serum after coagulating and removing the rubber components in natural rubber latex in a high temperature atmosphere of 150 to 250°C, evaporate the moisture, and form particles with an average particle size of 10 to 100μ. This is a powdery non-rubber component obtained from natural rubber latex serum, which is characterized by being in the form of a powder. The spray drying has a sample inlet drying temperature of 150
It is preferable to spray dry the sample into a spray drying container at ~250°C and a sample outlet temperature of 50~130°C. The spray drying process is performed using a disk rotating body, and the rotation speed of the disk rotating body is 10,000 to 10,000.
Preferably it is 30000r.pm. Alternatively, it is preferable that the spray drying step is performed using a nozzle and the serum is dripped by the nozzle at a nozzle blowing pressure of 0.5 to 2.0 Kg/cm ² . The present invention will be explained in more detail below. The powdered non-rubber component obtained from the natural rubber latex serum of the present invention is a substantially spherical powder with an average particle size of 10 to 100 microns. The composition of ingredients varies depending on the ingredients of the raw material natural rubber latex and cannot be strictly limited, but it includes α-globulin,
These include proteins such as hevein, fatty acids, amino acids, sugar, water, ash (inorganic components) such as K, Mg, Cu, Fe, Na, Ca, P, and other trace components. 1
As an example, Table 3 shows the analysis results of the proteins and amino acids contained in the powdered non-rubber component obtained in Example 5, which will be described later, by the Japan Food Research Center. The powdered non-rubber component obtained from the natural rubber latex serum of the present invention is obtained by coagulating and removing the rubber content from the natural rubber latex as a raw material using formic acid, acetic acid, sulfuric acid, etc. as a coagulant.
Spray dry in a high temperature atmosphere of 150 to 250℃,
Manufactured by evaporating water. One example of the components of natural rubber latex is shown in Table 1.

[Table] This natural rubber latex from which rubber hydrocarbons have been removed is called serum, and in general, industrially, serum usually contains a very small amount of rubber. The components of the serum vary depending on the components of the natural rubber latex, and various materials can be used as raw materials, but the serum contains about 0.5wt% rubber and about 0.5wt% non-rubber
Contains 2.0wt%. This is subjected to centrifugation, etc.
It may also be used after removing the rubber component. A non-rubber content (solid content) concentration of 2 to 50 wt% can be used, but from the viewpoint of production efficiency, manufacturing cost, and process control, it is preferable to use serum with a solid content of 15 to 35 wt% as a raw material. preferable. Normally, the solid content of the serum obtained in the natural rubber manufacturing process is approximately 3 to 5 wt%.
Therefore, it is preferable to carry out pretreatment to concentrate the solid content to about 25 to 35 wt% using a method such as an evaporator, centrifugation, or filtration. The serum is supplied in the form of minute droplets into a spray-drying container in a high-temperature atmosphere of 150 to 250°C, and water is instantly evaporated to form a powder. For this reason, a closed system spray drying method is used. The closed system spray drying method atomizes a liquid sample and instantly contacts the atomized droplets with hot air to evaporate water and dry them into powder. There are two types: the nozzle type, which uses a nozzle to atomize the particles, and the disk type, which uses a high-speed rotating disk to atomize the particles. Although any method may be used, the disk type is preferable because it is efficient. The rotation speed of the disk is
10000~30000rpm, nozzle pressure 0.5~2.0Kg/
^cm2 is good. If the rotation speed or pressure is outside this range, the size of the powder obtained will be outside the range of 10 to 100μ,
If the powder is less than 10μ, it absorbs moisture and is likely to re-solidify, or it may adhere to or aggregate on the inner wall of the spray dryer, resulting in a poor recovery rate, and the resulting powder will be lump-like and not atomized. 100μ
If the non-rubber component is used industrially, it will be difficult to dissolve in water or solvents, and the bulk will become large, making transportation inconvenient. The drying temperature in the spray dry container is 150-250℃
In particular, it is preferable to keep the sample inlet drying temperature at 150 to 250°C and the sample outlet temperature to 50 to 130°C. If the sample drying temperature is higher than this temperature range,
The resulting non-rubber component changes in quality due to heat.
Non-rubber components include proteins, sugars, resins, etc., all of which are easily affected by heat. The actual sample temperature is about 100°C lower than the inlet temperature, so from that point of view the drying temperature cannot be set too high. On the other hand, if the temperature is lower than this temperature range, sufficient drying will not be possible, and instead of becoming powder-like, it will aggregate and become lump-like. The powdered non-rubber components obtained from the natural rubber latex serum of the present invention are synthetic rubber modifiers, vulcanization accelerators, coating agents for rubber reinforcing fillers, feeds,
It is industrially useful and can be used in pharmaceuticals, etc. An example of the details of the usefulness is given in the applicant's patent application published in 1983.
−136390 (Special Publication No. 02-55372), Patent Application 1983−
It is stated in No. 136392 (Special Publication No. 03-51737). <Example> A powdered non-rubber component was produced using the raw latex having the composition shown in Table 2 and according to the manufacturing method shown in Table 2. Table 3 shows the analysis results of proteins and amino acids contained in the powdered non-rubber component obtained in Example 5. The equipment used for the spray method was a nozzle type spray dryer: L-5 manufactured by Yamato Scientific Co., Ltd.
(DL-41) type, disk type spray dryer: L-12 type manufactured by Okawara Kakoki Co., Ltd. Non-rubber components (solids) were measured using a Kett automatic moisture meter. The viscosity was measured using a B-type viscometer. Separately, as a comparative example, the same raw material latex as used in Examples 4 and 5 was used and treated at the disk rotation speed and sample drying temperature shown in Table 2. The average particle diameter of the obtained samples of Examples and Comparative Examples,
The particle shape, moisture content, particle color, and particle condition were measured and are shown in Table 2. Moisture content was measured using a Kett automatic moisture meter.

【table】

【table】

[Table] The following can be understood by referring to the Examples and Comparative Examples in Table 2. (1) When the disk rotation speed is outside the range of 10,000 to 30,000 rpm, the shape of the obtained non-rubber component becomes lumpy, or it tends to adhere to the inner wall of the dryer. (2) Inlet and outlet temperature of sample drying temperature is 250℃/
If the temperature is outside 130°C to 150°C/50°C, thermal denaturation of the sample will occur and drying will be insufficient. <Effects of the Invention> The powdered non-rubber component obtained from the natural rubber latex serum having an average particle size of 10 to 100μ according to the present invention can be used as a synthetic rubber modifier, a vulcanization accelerator, a coating agent for rubber reinforcing fillers, and feed. It is industrially useful for use in medicines, etc., and is easy to dissolve and mix in water or solvents, making it convenient for transportation. The powdered non-rubber component obtained from the natural rubber latex serum of the present invention can be produced with a desired average particle size and with good yield. When producing the non-rubber component of the present invention, spray drying is performed in a spray drying container with a sample inlet drying temperature of 150 to 250°C, a sample outlet temperature of 50 to 130°C, and a rotation speed of 10,000 to 30,000 r.pm.
This can be done with a rotary disk or by blowing pressure.
By using a 0.5-2.0Kg/ ^cm2 nozzle, the average particle size can be controlled to 10-100μ, and the resulting product powder is difficult to absorb moisture and coagulate, and does not adhere to the inner wall of the spray dryer. , the yield will be better. In addition, when used industrially, it is easily dissolved in water or a solvent, has an appropriate bulk specific gravity, and is easy to transport. In addition, non-rubber components such as proteins, sugars, and resins in the serous fluid, which had traditionally caused pollution problems due to environmental pollution as waste during the production of natural goku, are separated from water, and a non-rubber powder with high utility value is produced. Since it can be used as a component, it completely eliminates pollution problems, has a high resource saving effect, and increases the efficiency of the rubber industry.

Claims (1)

[Claims] 1. The remaining serum after coagulating and removing the rubber components in natural rubber latex is spray-dried in a high-temperature atmosphere of 150 to 250°C to evaporate the moisture and reduce the average particle size to 10 to 250°C.
A powdery non-rubber component obtained from natural rubber latex serum, characterized in that it is in the form of a 100μ powder. 2 The spray drying is performed at a sample inlet drying temperature of 150°C.
The powdered non-rubber component obtained from natural rubber latex serum according to claim 1, which is spray-dried into a spray-drying container at a temperature of ~250°C and a sample outlet temperature of 50-130°C. 3. The spray drying step is performed using a disk rotating body, and the rotation speed of the disk rotating body is 10,000.
A powdered non-rubber component obtained from the natural rubber latex serum according to claim 1 or 2, wherein the natural rubber latex serum has a rotation rate of 30,000 rpm. 4 The spray drying process is performed using a nozzle, and the dripping of the serum by the nozzle is controlled by the nozzle blowing pressure.
The powdered non-rubber component obtained from the natural rubber latex serum according to claim 1 or 2, which has a weight of 0.5 to 2.0 Kg/cm ² .