I. PS compounding
1. PS/LDPE blend modified material
Formulation | Proportion |
Resin PS | 100 |
Compatilizer HPB-g-PS | 10 |
LDPE | 20 |
2. process control
Stir the PS in a high speed mixer at a certain temperature for 5 min, and the extrusion temperature is 160-165 ℃.
3. Characteristic of materials
tensile strength | 20.8～23.6MPa |
elongation at break | 4.5%～5.8% |
impact strength | 12.5～14.3 J/m |
II. Flame retardant reinforced toughened PS/PBT blends
Formulation | Proportion |
Resin PS | 43 |
Intensifier glass fibre（10-20μm） | 11 |
PBT( L2100) | 16 |
Fire retardant Tris (tribromophenyl) cyanuric acid ester (FR245) | 11 |
Compound toughening agent | 10 |
Antidrop agent Polytetrafluoroethylene (SN3300) coated with Styrene-Acrylonitrile Resin | 0.8 |
Antioxygen ( Ultranox626) | 0.2 |
Compatilizer Styrene-maleic anhydride copolymer (SMA218) | 8 |
1. Process control
The L / D of the extruder is 40, the temperature of the extruder barrel is: 180 ~ 190 ℃ for the first zone, 200 ~ 210 ℃ for the second zone, 220 ~ 230 ℃ for the third zone, the head temperature is 210 ℃, and the screw speed is 350 ~ 450 r / min.
2. Characteristic of materials
Tensile strength | 112MPa |
Bending strength | 167MPa |
Vertical combustibility | UL-94 V-0 |
The material not only has excellent strength and toughness, but also has good flame retardancy. It has a broad application prospect in the fields of electronic and electrical equipment.
III. PS foaming
1. Microcellular PS wood-imitating plastics
Formulation | Proportion | |
Resin PS | 100 | |
Nucleator CaCO3 | 2.5 | |
Foaming agent AC | 0.7 | |
Lubricant HSt | 0.4 | |
Crosslinking agent DCP | 0.15 | |
Pigment Brown purple | 1-2 | |
Chain-cutting agent aminoethyl alcohol | 0.1 |
2. Process control
PS was mixed in a high-speed mixer for 5 minutes and the mixing temperature was 100 ℃. The second extrusion foaming was suitable for low temperature extrusion. The temperature of each section of the barrel was controlled in the range of 100 ~ 185 ℃, and the rotating speed of the screw was 40 ~ 50 r / min.
3. characteristic of materials
Density | 0.1～0.4 g/cm3 |
The appearance and endoplasmic of Microcellular PS wood-imitating plastics is similar to wood. It can be nail, saw, planer. The surface is smooth, light and rigid.
IV. Low foaming HIPS plastic paper
Formulation | Proportion |
Resin HIPS | 100 |
Nucleator CaCO3 | 2.5 |
Foaming agent EVA Foaming masterbatch | 2-3 |
Lubricant HSt | 0.2 |
Crosslinking agent DCP | 0.2 |
1. Process control
The L / D of the extruder is 25. The temperature of the barrel is: 100 ℃ for the first zone, 130 ℃ for the second zone, 115 ℃ -130 ℃ for the third zone, and the diehead temperature is 90 ℃.
2. Characteristic of materials
Products extruded with EVA foaming masterbatch is widely used in propaganda, such as paper imitation, food tray, food box and others, because of its uniform pore, good surface gloss, low density and good mechanical properties.
V. Flame retardant PS
1. Universal Flame retardant Modification of PS
Formulation | Proportion |
Resin PS | 100 |
Flame retardant Bis (dibromopropyl) phosphate | 3 |
Flexibilizer polybutadiene rubber | 8 |
Sb2O3 | 3 |
2. Process control
The extruder L / D ≥ 28. The barrel temperature controlled at 170 ℃. The screw rotation speed 80 ~ 100 r / min.
3. Characteristic of material
Oxygen index | ≥26% |
Combustibility | UL-94 V-0级 |
Tensile strength | 22～26MPa |
Bending strength | 34～38MPa |
Elongation at break | 1.8%～2.1% |
Impact strength | 11～15kJ/m2 |
Distortion temperature ( 1.82MPa) | 89～100℃ |
VI. Halogen free flame retardant modified HIPS
Formulation | Proportion |
Resin HIPS | 100 |
Coupler KR-212 | 0.5 |
Flame retardant Al(OH)3 | 50 |
Flexibilizer SEBS | 5 |
Mg(OH)2 | 10 |
Lubricant HSt | 0.5 |
Coated red phosphorus | 3 |
1. Process control
Mix the PS for 5～10min, and then put them into twin screw extruder. The extruder screw L/D ≥ 25, extrusion temperature 170 ~ 200 ℃, screw speed 100 ~ 140r / min.
2. Characteristic of material
Oxygen index | 27%～29% |
Combustibility | UL-94 V-0 |
Tensile strength | 38～42MPa |
Bending strength | 50～60MPa |
Elongation at break | 1.0%～2.0% |
Notch impact strength (23℃) | 45～55 J/m |
Distortion temperature （Under 1.82MPa） | 100～110℃ |
