Wax treatment method

Abstract

The wax treatment method comprises the following steps: heating and melting wax scraps in a vacuum chamber, and collecting wax materials containing impurities after cooling; heating the wax material in deionized water to form a wax liquid, adding a hydrochloric acid solution and alum into the wax liquid, and heating for a preset time in a boiling state to obtain a mixture; and standing the mixture to obtain surface wax liquid, and pouring the surface wax liquid into a solid state. According to the invention, the recovery purity and quality of wax can be improved, so that the service life of wax is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of semiconductor bonding, and in particular to a wax processing method. Background Art

[0002] In the field of semiconductor manufacturing, wax is often used for bonding. In order to ensure environmental protection and recyclability, wax can be reused, provided that impurities, dust and other debris inside are removed. The traditional wax processing process is relatively complicated and time-consuming, and the moisture and impurities are not processed cleanly, and the purity is not high. The purity of the existing processed wax is about 85%, which is easy to cause an increase in the scrap rate when reused, which is not conducive to the life and effect of recycling.

[0003] Therefore, it is urgent to provide an optimized wax processing method to overcome the above defects. Summary of the invention

[0004] The object of the present invention is to provide a wax processing method to improve the recovery purity and quality of the wax, thereby extending the re-service life of the wax and reducing production costs.

[0005] To achieve the above object, a wax processing method comprises the following steps:

[0006] The wax fragments are heated and melted in a vacuum chamber, and the wax material containing impurities is collected after cooling;

[0007] Heat the wax material in deionized water to form a wax liquid, add a hydrochloric acid solution and alum to the wax liquid, and heat it under boiling state for a predetermined time to obtain a mixture; and

[0008] The mixture is allowed to stand to obtain a surface wax liquid and poured into a solid state.

[0009] Compared with the prior art, the present invention heats and melts the recovered wax fragments in a vacuum chamber, collects wax materials containing more impurities after cooling, then heats the wax materials in deionized water to form wax liquid, then adds hydrochloric acid solution and alum, heats the mixture for a predetermined time under boiling state, separates the wax and impurities after standing, thereby obtaining a pure surface wax liquid, and finally pours it into a solid form for collection and reuse. The method can obtain wax with a high purity (more than 95%), thereby increasing the service life of reuse and reducing the production cost. Moreover, the performance of the product is guaranteed during reuse, and the product scrap rate is reduced. The method is simple and easy to implement, and is suitable for industrial use.

[0010] Preferably, the step of heating and melting the wax pieces in the vacuum chamber comprises: adjusting the vacuum chamber to a negative pressure and controlling the temperature in the vacuum chamber, wherein the negative pressure and the temperature are suitable for melting the wax pieces.

[0011] Preferably, the negative pressure in the vacuum chamber is -65 kPa to -80 kPa.

[0012] Preferably, the temperature of the vacuum chamber is lower than the melting point of the wax fragments.

[0013] Preferably, the step of adding hydrochloric acid solution and alum to the wax liquid comprises: the concentration of the hydrochloric acid solution is 5%-10%, and the weight of the hydrochloric acid solution is 2%-3% of the weight of the wax liquid.

[0014] Preferably, the alum is 20-30 grams and is heated under boiling conditions for 20-40 minutes.

[0015] Preferably, the weight ratio of the deionized water to the wax material is 2:1 to 2.5:1. DETAILED DESCRIPTION

[0016] The wax treatment method of the present invention is further described below in conjunction with the examples, but the present invention is not limited thereby. The method of the present invention aims to provide a wax treatment method to improve the recovery purity and quality of the wax, thereby extending the re-service life of the wax and reducing production costs.

[0017] In one embodiment of the wax treatment method of the present invention, the following steps are included:

[0018] The wax fragments are heated and melted in a vacuum chamber, and the wax material containing impurities is collected after cooling;

[0019] Heat the wax material in deionized water to form a wax liquid, add a hydrochloric acid solution and alum to the wax liquid, and heat it under boiling state for a predetermined time to obtain a mixture; and

[0020] The mixture is allowed to stand to obtain a surface wax liquid and poured into a solid state.

[0021] The present invention heats and melts the recovered wax fragments in a vacuum chamber, collects wax materials containing more impurities after cooling, then heats the wax materials in deionized water to form wax liquid, then adds hydrochloric acid solution and alum, heats the mixture for a predetermined time under boiling state, separates the wax and impurities after standing, thereby obtaining a pure surface wax liquid, and finally pours the wax into a solid form for collection and reuse. The method can obtain wax with high purity (more than 95%), thereby increasing the service life of reuse and reducing the production cost. Moreover, the performance of the product is guaranteed during reuse, and the product scrap rate is reduced. The method is simple and easy to implement, and is suitable for industrial production.

[0022] Specifically, as a preferred embodiment, the collected wax is first crushed and then placed in a sealed vacuum chamber. The vacuum chamber is controlled to have a negative pressure, for example, -65kpa to -80kpa. The bottom of the vacuum chamber is heated to maintain the temperature of the vacuum chamber at 45-50°C, which is lower than the melting point of the wax. By controlling the air pressure and temperature in the vacuum chamber, the wax pieces can be melted at a temperature lower than its melting point, and the water is evaporated to prevent the wax from being oxidized and deteriorated, and saponification will not occur. After cooling, the pure wax on the surface and the wax material containing impurities on the bottom are separated.

[0023] Then, the wax material containing impurities is placed in a deionized water tank and heated to a boiling state to form a wax liquid. The weight ratio of deionized water to wax material is 2:1 to 2.5:1. Then, a 5-10% hydrochloric acid solution is slowly added, and the weight of the hydrochloric acid solution is 2%-3% of the weight of the wax liquid. At the same time, 20-30 grams of alum is added, and heated in a boiling state for 20-40 minutes to obtain a mixture.

[0024] The above water tank is left to stand for more than 1 hour to separate the wax liquid and impurities into layers, with water and impurities located at the bottom layer and wax liquid located at the upper layer, and liquid separation treatment is performed to obtain wax liquid with a purity of more than 95%. The wax liquid on the surface is poured into a wax basin and cast into ingots, which are poured out for use after cooling and hardening.

[0025] In summary, the method can obtain wax with higher purity, thereby increasing the service life of the reused wax and reducing the production cost, and the performance of the product is guaranteed during the reuse, thereby reducing the product scrap rate. Moreover, the method is simple and easy to implement, and is suitable for industrial use.

[0026] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A wax processing method, characterized in that: The following steps are involved: The wax fragments are heated and melted in a vacuum chamber, and the wax material containing impurities is collected after cooling; Heat the wax material in deionized water to form a wax liquid, add a hydrochloric acid solution and alum to the wax liquid, and heat it under boiling state for a predetermined time to obtain a mixture; and The mixture is allowed to stand to obtain a surface wax liquid and poured into a solid state.

2. The wax processing method according to claim 1, characterized in that: The step of heating and melting the wax pieces in the vacuum chamber comprises: adjusting the vacuum chamber to a negative pressure and controlling the temperature in the vacuum chamber, wherein the negative pressure and the temperature are suitable for melting the wax pieces.

3. The wax processing method according to claim 2, characterized in that: The negative pressure in the vacuum chamber is -65 kPa to -80 kPa.

4. The wax processing method according to claim 2, characterized in that: The temperature of the vacuum chamber is lower than the melting point of the wax fragments.

5. The wax processing method according to claim 1, characterized in that: The step of adding hydrochloric acid solution and alum to the wax liquid comprises: the concentration of the hydrochloric acid solution is 5%-10%, and the weight of the hydrochloric acid solution is 2%-3% of the weight of the wax liquid.

6. The wax processing method according to claim 5, characterized in that: The alum is 20-30 grams and is heated under boiling conditions for 20-40 minutes.

7. The wax processing method according to claim 1, characterized in that: The weight ratio of the deionized water to the wax material is 2:1 to 2.5:1.