▎ 摘　　要

NOVELTY - White foaming film comprises three-layer of a barrier layer, a white foaming layer and a radiating layer. The white foaming layer comprises 45-65 pts. wt. matrix resin, 15-40 pts. wt. high temperature resin, high-temperature resin refers to the resin with a melting point of 140-220°C, 5-15 pts. wt. white filler, 5-10 pts. wt. foaming agent, 0.1-5 pts. wt. acid-absorbing filler, and 0.3-1.2 pts. wt. cross-linking agent. The barrier layer comprises 95-99 pts. wt. polyolefin elastomer, 0.2-1.0 pts. wt. initiator, 0.3-1.2 pts. wt. cross-linking agent, 0.1-0.5 pts. wt. coupling agent, 0.01-0.1 pts. wt. antioxidant, 0.05-0.2 pts. wt. light stabilizer. The radiating layer comprises 70-85 pts. wt. polyolefin elastomer, 10-20 pts. wt. heat conducting filler, 5-10 pts. wt. heat conducting fiber, 0.25-1.0 pts. wt. initiator, 0.3-1.2 pts. wt. cross-linking agent, 0.1-0.5 pts. wt. coupling agent, 0.01-0.1 pts. wt. antioxidant and 0.05-0.2 pts. wt. light stabilizer. USE - Used as white foaming film. ADVANTAGE - The white foaming film ensures the processability and reliability of the middle white foaming layer, solves the problem of extruding foaming dead material, increases the heat conducting efficiency and component power, reduces self-ignition risk, avoids the bubble breaking, reduces the off-line pre-cross-linking process and optimizes the production process. DETAILED DESCRIPTION - White foaming film comprises three-layer of a barrier layer, a white foaming layer and a radiating layer, the thickness of the barrier layer and the radiating layer is 100-200 μm, and the thickness of the white foaming layer is 350-500 μm. The white foaming layer comprises 45-65 pts. wt. matrix resin, 15-40 pts. wt. high temperature resin, high-temperature resin refers to the resin with a melting point of 140-220°C, 5-15 pts. wt. white filler, 5-10 pts. wt. foaming agent, 0.1-5 pts. wt. acid-absorbing filler, 0.3-1.2 pts. wt. cross-linking agent, the barrier layer comprises 95-99 pts. wt. polyolefin elastomer, 0.2-1.0 pts. wt. initiator, 0.3-1.2 pts. wt. cross-linking agent, 0.1-0.5 pts. wt. coupling agent, 0.01-0.1 pts. wt. antioxidant, 0.05-0.2 pts. wt. light stabilizer, the radiating layer comprises 70-85 pts. wt. polyolefin elastomer, 10-20 pts. wt. heat conducting filler, 5-10 pts. wt. heat conducting fiber, 0.25-1.0 pts. wt. initiator, 0.3-1.2 pts. wt. cross-linking agent, 0.1-0.5 pts. wt. coupling agent, 0.01-0.1 pts. wt. antioxidant and 0.05-0.2 pts. wt. light stabilizer. An INDEPENDENT CLAIM is also included for preparing white foaming glue film, comprising (i) mixing the acid absorbing filler, white filler and high temperature resin by high mixing machine, double-screw pelleting to obtain the needed shape master batch, (ii) stirring the base resin in the white foaming layer, cross-linking agent and the master batch prepared in the mixing chamber A, (iii) mixing the polyolefin elastomer in the barrier layer, initiator, coupling agent, cross-linking agent, antioxidant, light stabilizer are stirring in the B mixing chamber, (iv) mixing the polyolefin elastomer in the radiating layer, heat conducting filler, heat conducting fiber, initiator, coupling agent, cross-linking agent, antioxidant, light stabilizer are stirred in the C stirring chamber, and (v) extruding the prepared white foaming layer spare material by A screw and pumping the gas foaming agent at the end foaming section of the screw rod, adding the prepared barrier material in the B screw, adding the radiating layer material in the C screw, passing through the distributor, using the co-extrusion method to make the barrier layer, the white foaming layer and the radiating layer are compounded in the film, forming a barrier layer, a white foaming layer and a radiating layer three-layer structure and winding. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the white foaming film. 1Barrier layer 3White foaming layer 4Radiating layer