Liquid silicone rubber (LSR) chu foaming agent (physical emaw chemical emaw) nen an pawlh a, mold-a heating leh vulcanization molding process an neih lai hian foaming agent chuan gas a siam chhuak a, chu chuan microcellular foaming structure inang leh tha tak a siam a ni.
1. Raw material siam dan: 1.1.
Two-component liquid silicone rubber (A&B components) hmang rawh. Base rubber compound hi a tlangpuiin pre-supplier-in a buatsaih thin. Component A hian a tlangpuiin catalyst a pai a, component B hian crosslinking agent a nei bawk. A tawp bera thil siam chhuah performance mamawh dan azirin (Density, Hardness, leh Color ang chi), base rubber compound-a colour paste, thermal conductive fillers (alumina ang chi), emaw flame retardant leh additive dangte dah belh a ngai thei bawk. Heng additives te hi component A emaw Component B emaw nen a inang tlangin an inhmeh tlangpui thin.
2. Foaming Agent Thuhmahruai (Foaming Agent Thuhmahruai) .Hei hi inzawmna pawimawh ber a ni. Foaming agent chi hrang hrang atanga a lan dan chuan technical route pahnih ah then a ni a:
Process: Supercritical CO2 siam chhuah .: Liquid CO2 hi a lum a, a pressurized a, chu chu dedicated equipment hmangin supercritical state-ah a dah a ni. Metering leh Injection: High-pressure metering pump dik tak hmangin, liquid silicone rubber-a A component flow path-ah supercritical CO2 engemaw zat inject a ni. Static mixing: Component A (SCCO2 awmna already) leh component B te chu static mixer kal tlanga kan kal hian uluk takin an inhmeh tir thin. Chutih laiin, SCCO2 chu rubber compound-ah pressure sang tak hnuaiah a inang tlangin a inthiar a, chu chuan -phase homogeneous mixture pakhat a siam a ni. Co2 hian a hmaa a chhuah loh nan pressure sang tak hnuaiah a kalpui vek a ni.
b) Chemical foaming foaming agent:thermally decomposable chemical foaming agents, azodicarbonamide (AC foaming agent) ang chi hmang rawh. Process: Pre-Foaming agent powder chu component A emaw Component B emaw chu stirring device-ah inang tlangin mix rawh. Product chu defect a nih theih nan-free a nih chuan, stirring process chhunga boruak luh tir tur chuan mix hnuah vacuum deaeration a ngai tlangpui.
3.vulcanization leh foaming: 1.1.
Physical Foaming: Rubber compound chu mold cavity-ah a inject hnuah pressure chu a chhuak a, chu chu rubber compound-ah chuan supercritical CO2 chu rang takin a inthlak a, bubble nuclei a siam a ni. Chutih laiin, temperature sang tak chuan vulcanization leh cross-silicone rubber-a reaction awmte a thlen a, bubble structure chu a lock a, cell a siam bawk.
Chemical foaming: Mould temperature sang lutuk hian chemical foaming agent chu a ti chhe a, gas (N2 ang chi) a siam chhuak thin. Chutih rual chuan silicone rubber chu vulcanized a ni a, gas te chu rubber network siamah chuan encapsulate a ni a, chu chuan cell a siam a ni.
4. Hmuhchhuahna: 1.1.Vulcanization foaming cycle a zawh hnuah (a tlangpuiin second sawm atanga minute engemaw zat chhungin) mold chu hawng la, product chu la chhuak rawh. LSR viscosity a hniam avangin a thil siamte hi a tlangpuiin mold-ah an innghat lo va, tihchhiat a awlsam hle.
5. Post-Curing (Vulcanization pahnihna)(Post-Curing) Demolding hnua foamed products te hian darkar 1-2 chhung temperature 150℃- 200℃vel temperature-a oven-a curing an neih a ngai tlangpui.