A method for making heat dissipation adhesive from agricultural surplus materials

Abstract

This invention discloses a method for preparing a heat-dissipating adhesive from agricultural waste materials, comprising the following steps: Step (1), crushing an agricultural waste material and uniformly adding a microwave absorbing material; Step (2), microwave heating the agricultural waste material to collect a solid substance; Step (3), washing and drying the solid substance to obtain a coked carbon material; Step (4), microwave heating the coked carbon material with added metal particles to obtain a graphitized carbon powder; Step (5), performing magnetic sieving to remove residual metal particles in the graphitized carbon powder to obtain a high-purity graphitized carbon powder; Step (6), uniformly mixing the graphitized carbon powder with a substrate and an additive to obtain a heat-dissipating initiating liquid; and Step (7), performing vacuum degassing on the heat-dissipating initiating liquid to obtain a heat-dissipating adhesive. This process is simple and convenient to operate, and is fast and energy-saving.

Claims

1. A method for preparing a heat-dissipating adhesive from organic waste materials, comprising the following steps: Step (1), crushing an agricultural waste material to less than 10 mm and uniformly adding a microwave absorbing material, wherein the amount of microwave absorbing material added to the agricultural waste material is between 2% and 10% of the weight percentage of the agricultural waste material; Step (2), heating the agricultural waste material to 600-800°C under a first low-oxygen condition and holding it for 10-30 minutes, and collecting a solid substance generated from the agricultural waste material; Step (3), washing and drying the solid substance to obtain a coke. Carbon material; Step (4), the coked carbon material is further pulverized to below 0.5 mm, a metal particle material is added, and it is heated by microwave to 1300-1600°C for 10-20 minutes under a second low-oxygen condition to obtain a graphitized carbon material powder; Step (5), a magnetic sieving is performed to remove the metal particle material remaining in the graphitized carbon material powder to obtain a high-purity graphitized carbon material powder; Step (6), the graphitized carbon material powder is uniformly mixed with a substrate and an additive to obtain a heat dissipation initiating liquid; and Step (7), the heat dissipation initiating liquid is subjected to vacuum degassing to obtain a heat dissipation adhesive.

2. A method for making a heat-dissipating adhesive from organic residual materials as claimed in claim 1, wherein the microwave absorbing material in step (1) may be carbon black, graphite, activated carbon and carbon fiber, or a mixture thereof.

3. The method for making heat-dissipating adhesive from organic waste materials as claimed in claim 1, wherein during microwave heating in step (2), the ratio of microwave power (unit kW) to the weight of the agricultural waste materials (unit kg) is between 2:1 and 10:

1.

4. The method for making thermal adhesive from organic residual materials as claimed in claim 1, wherein the metal particle material in step (4) may be carbon iron, nickel copper zinc ferrite magnet, nickel zinc ferrite magnet, manganese zinc ferrite magnet, or a mixture thereof.

5. A method for making thermal adhesive from organic residual materials as claimed in claim 1, wherein in step (3), the solid material is added to an acidic mixed material and reacted for a period of time, and further includes washing with distilled water until pH=7 and then drying.

6. The method for making thermal adhesive from organic residual materials as claimed in claim 1, wherein the second low-oxygen condition in step (4) refers to the introduction of nitrogen gas during the heating process so that the amount of oxygen is less than one-third of the amount of oxygen in normal air.

7. The method for making thermal adhesive from organic residual materials as claimed in claim 1, wherein during microwave heating in step (4), the ratio of microwave power (unit kW) to the weight (unit kg) of the coke carbon material is between 10:1 and 15:

1.

8. A method for making a thermal adhesive from organic residual materials as claimed in claim 1, wherein in step (6), the substrate is selected from silicone, epoxy resin, grease and combinations thereof.

9. A method for preparing a thermal adhesive from the organic residual material of claim 1, wherein in step (6), the additive is selected from a dispersant, a rheology modifier, a stabilizer, and a combination thereof.

10. A method for making a thermal adhesive from organic residual materials as claimed in claim 1, wherein in step (6), the weight percentage of the graphitized carbon powder in the thermal initiation liquid is between 30% and 50%.

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