Polypropylene ( PP ) is one of the most commonly used general-purpose plastics, but the higher crystallinity also causes PP low-temperature toughness, large molding shrinkage and large notch sensitivity, which limits its wider range to a certain extent. application. Blending modification is the most effective way to toughen PP. It utilizes the principle of compatibility or reaction blending between components, mechanically blending two or more polymers with additives at a certain temperature, and finally forming a macroscopically uniform, microscopically A new material that is phase separated. Through the blending of PP, the comprehensive performance can be greatly improved, and it competes with engineering plastics and polymer alloys in many application fields. 
The next step is the specific modification formula and process, and the dry goods are quickly collected!
The main blends and modification effects of PP blending modification are as follows:
The next step is the specific modification formula and process, and the dry goods are quickly collected!
1. PP/LDPE blending modification
formula:
Resin PP 100; compatibilizer PE-g-MAH 5; LDPE 20; lubricant HSt 0.3;
Processing technology:
The PP and PE, the compatibilizer and the auxiliary agent are mixed, stirred, extruded and granulated according to the formulation ratio to prepare a modified material. The temperature of the extruder barrel is: a section of 210 ° C, two sections of 215 ° C, three sections of 210 ° C; screw length to diameter ratio of 25:1; screw speed of 120 ~ 160 r / min.
performance:
Blending PP with PE can improve the toughness of PP and increase the impact strength of low temperature drop ball. The yield stress of the blended material according to the formulation ratio was 13.6 MPa; the yield strain rate was 12.3%, the fracture stress was 4.78 MPa, and the fracture strain rate was 114.6%.
2. PP/HDPE blending modification
formula:
Resin PP 57.35; antioxidant 1076 0.2; HDPE 40; PEPQ 0.2; crosslinking agent t-butyl peroxycumene 0.15; processing aid magnesium stearate 0.1; filler wollastonite 2;
Processing technology:
The components were mixed in a high-speed mixer at normal temperature and normal pressure for 10 minutes, and then melt-blended by a twin-screw extruder to extrude and granulate. The extrusion temperature is 150-220 ° C, the screw rotation speed is 300 r / min, and the PP/HDPE blending modified material is obtained through the pelletizing and drying process.
performance:
The tensile strength was 34.8 MPa, and the cantilever beam impact strength was 49.3 J/m. The material has a good matting effect and can be used in packaging, daily necessities and building materials.
3. PP/LLDPE blending modification
formula:
Resin PP (EPF30R) 60-70; titanate coupling agent (ND2-311) appropriate amount; LLDPE 15-20; antioxidant toughening agent POE (8150) 5 ~ 10; light stabilizer amount; filler talcum powder (average particle diameter 12 μm) 10 to 15;
Processing technology:
Preheat to a high-speed mixer to 110 ° C, add a certain amount of inorganic filler, stir at low speed for 15 min, add the coupling agent with a mass fraction of 2% three times, add the coupling agent every time, stir at high speed for 5 min, then release Packing spare. Accurately weigh PP, PE, POE, filler and other additives according to the proportion of the formula, mix and add to the hopper of twin-screw extruder, and extrude and granulate.
The extrusion temperature was 190-220 ° C, the main screw rotation speed was 200 r/min, and the feed screw rotation speed was 20 r/min. After the pellets are dried, they are injection molded into the desired product at an injection temperature of 190-210 ° C, an injection molding and holding pressure Mpa, and a pre-plastic pressure of 6 MPa.
performance:
Blending with PP and LLDPE can improve the toughness and environmental stress cracking resistance of PP. At the same time, POE is added to toughen, and the toughness of the blend is greatly improved. The talc is used to increase the rigidity to ensure sufficient rigidity of the material. The tensile strength is ≥26MPa, the elongation at break is ≥400%, the flexural modulus is ≥1.6GPa, the heat distortion temperature is ≥110°C, and the molding shrinkage is 1.15%. This product is mainly used as a material for light automotive door linings.
4. Super tough PP/POE blending modification
formula:
Resin PP (K7726) 329; PP (K8303) 120; PP (2401) 90; Toughener POE (8150) 256; Antioxidant 1010 1.2; Antioxidant DLTP 2.4; Lubricant ZnSt 2.4; Colorant Carbon Black 0.5 ;
Processing technology:
First, the components were weighed according to the formulation ratio, placed in a high-speed mixer for 1 min at low speed, then stirred at high speed for 1 min, discharged, placed in a twin-screw extruder, and mixed and extruded into pellets. Twin-screw extrusion granulation adopts medium-strong shearing screw combination. The temperature of each section is: first section 180°C, second section 195°C, third section 210°C, fourth section 220°C, fifth section 235°C , the head is 230 ° C, the screw speed is 350 r / min
performance:
Tensile strength 17MPa; elongation at break 500%; bending strength 18MPa; flexural modulus 700MPa; cantilever beam notched impact strength (normal temperature) 750J/m, (-40°C) 320J/m; heat distortion temperature (1.82MPa) 102 ° C.
5. PP/HDPE/POE blending modification
formula:
Copolymer type PP (M1600) 30; filler CaCO3 (400 mesh) 20; homopolymer PP (V30G) 15; titanate coupling agent 0.2; HDPE (8920) 20; 20 dispersant liquid paraffin 0.1; toughening agent POE 15;
Processing technology:
CaCO3 was first dried at 110 ° C for 4 h, mixed in a high-speed mixer for 1 min according to the formulation ratio, and then mixed with a titanate coupling agent and a dispersant for 3 min at low speed for surface activation treatment. The purpose of the activation treatment is to increase the miscibility between the inorganic filler and the resin. Then, PP, HDPE, POE and surface-activated CaCO3 were mixed and stirred uniformly, and the mixing temperature was 100-105 ° C for 5 min. Finally, the mixture was subjected to extrusion granulation using a φ58 twin-screw extruder. The extrusion temperature was 210 ° C and the screw speed was 140 r/min.
performance:
The tensile strength was 18.5 MP, the fracture strain rate was 61%, and the notched impact strength was 32.0 kJ/m 2 . The talc powder in the filling modification of PP is better than CaCO3, but has higher plasticity and toughness retention. POE has a better toughening effect than EPDM.
6. PP/HDPE/EPDM blending modification
formula:
Resin PP 100; toughener EPDM 15%; HDPE 20; lubricant HSt 0.4;
Processing technology:
PP, HDPE, EPDM and lubricant are added together in a high-speed mixer according to the formulation ratio. The mixing and mixing are uniform, and the mixing temperature is 100-105 ° C for 5 min. Extruder and then pelletized blend. The extruder has a length to diameter ratio of 25:1; the barrel temperature is 170~175°C, the second section is 180～190°C, the third section is 200～210°C, the fourth section is 210～220°C; the screw speed is 60～100 r/min. .
performance:
Tensile strength 27.5 MPa; bending strength 34.2 MPa; notched impact strength 24.8KJ/m2. EPDM has similar solubility parameters and surface tension values ​​to PP. It can be considered that the two have certain compatibility. When blending, it has better compatibility and toughening effect.
7, PP / HDPE / EVA Blending
formula:
Resin PP (powder) 100; EVA (VA content 18%) 15; filler active CaCO3 (800 mesh) 30; HDPE (5000s) 10; stabilizer BaSt 0.3; lubricant HSt 0.5;
Processing:
Formulation ratio by the respective materials were added in a high speed mixer, high speed mixing and stirring 10min, the material temperature reached 90 ~ 100 ℃, the active CaCO3 powder, HDPE, EVA PP powder is mixed with the material evenly.
The mixed material with a φ45 extruder, extrudate die amended cooling tank, air-cooled, and then pelletized by traction into the granulator. The extruder barrel is: feeding section 80-100 ° C, compression section 170-180 ° C, homogenization section 180-190 ° C, die temperature 190 ° C; screw rotation speed 60-120 r / min.
performance:
Tensile strength 25.5MPa; flexural strength 38.9MPa; elongation at break 255%; notched impact strength 9.1kJ/m2; heat distortion temperature (18.6MPa) 59°C. EVA modified PP material has high impact performance, good toughness, high gloss and low cost, and has broad application prospects in engineering.
8. PP/PS blending modification
formula:
Resin PP 100; PS 10; compatibilizer SBS 10; lubricant HSt 0.4;
Processing technology:
The components were weighed according to the formulation ratio, mixed in a high-speed mixer, uniformly mixed, discharged, and then melt-blended and extruded into granules in an extruder. The extrusion temperature is 170-230 °C.
performance:
The yield strength is 29.2 MPa; the elongation at break is 7%; the elastic modulus is 1432 MPa; and the impact strength is 27 kJ/m2.
PP and PS are incompatible systems, and the addition of SBS reduces the size of the dispersed phase and promotes uniform dispersion of the system, thereby enhancing toughness and compatibility.
9. PP/HIPS blending modification
formula:
Resin PP 51.8; nucleating agent sodium phosphate 0.1; HIPS 18; sodium dicycloheptanedicarboxylate 0.1; filler talc 30;
Processing technology:
The components were weighed according to the formulation ratio, mixed in a high-speed mixer, uniformly mixed, discharged, and then melt-blended and extruded in a twin-screw extruder. The extrusion temperature is 190 to 210 ° C, and the screw D/L ≥ 32.
performance:
The automobile parts prepared by the material have low linear expansion coefficient and uniformity, the dimensions of the workpiece are stable, and the assembly gap is small, and the automobile is used under different temperature environments.
10. PP/PA66 blending modification
formula:
Resin PP 100; compatibilizer PP-g-MAH 10; PA66 20; auxiliary 0.2;
Processing technology:
The PP, PA and the auxiliary agent are mixed and stirred in a high-speed mixer, and then extruded and granulated. Mixing temperature 80-100 ° C, stirring time 10 min; extrusion temperature 200-245 ° C, screw speed 60-120r / min
performance:
The blending of PA66 and PP makes the notched impact strength of the blended material at normal temperature and low temperature greatly improved. After the incorporation of 10% PP-g-MAH, the notched impact strength of the blend reaches 108.9 J/m2; The strength is 38.8 MPa; the elastic modulus is 1710 MPa; the elongation at break is 37%.
11, PP / PET blending modification
formula:
Resin PP 100; nucleating agent 0.1; PET 15; compatibilizer PP-g-AA 5;
Processing technology:
The components were weighed according to the formulation ratio, placed in a high-speed mixer, mixed and stirred uniformly, and discharged, and then melt-blended and extruded into granules in an extruder. The extruder L/D is 25:1; the cylinder temperature is 200-230 ° C, and the screw speed is 60-100 r/min.
performance:
The tensile strength was 34.2 MPa; the bending strength was 63.1 MPa. The blending of PET and PP can not only improve the shortcomings of PET, but also improve the impact strength and mechanical properties of PP. However, the polarities of the two resins are quite different, PET is a polar polymer, and PP is a non-polar polymer, and the compatibility between the two is poor. The addition of PP-AA 5 significantly improved the compatibility between the two.
12, PP / PBT blending modification
formula:
Resin PP 100; PBT 20; lubricant EBS 0.5; compatibilizer E/EA/GMA 5;
Processing technology:
The components were weighed according to the formulation ratio, placed in a high-speed mixer, mixed and stirred uniformly, and discharged, and then melt-blended and extruded into granules in an extruder. The extruder has an L/D ≥ 20:1; a cylinder temperature of 190 to 230 ° C; and a screw rotation speed of 100 to 160 r/min.
performance:
The tensile strength was 37.2 MP; the bending strength was 76.5 MPa; and the impact strength was 10 KJ/m 2 . PBT is a polar polymer, and PP is a non-polar polymer. The two are incompatible. E/EA/GMA compatibilizer is used to improve the interfacial adhesion and achieve good compatibility.
13, PP / SBS blending modification
formula:
Resin PP 100; toughener SBS 20; antioxidant 1520-D 0.4; lubricant EBS 0.2;
Processing technology:
The components were weighed according to the formulation ratio, placed in a high-speed mixer, mixed and stirred uniformly, and discharged, and then melt-blended and extruded into granules in an extruder. The extruder has a length to diameter ratio of 25:1: an extrusion temperature of 155 to 215 ° C; and a screw rotation speed of 100 to 160 r/min.
performance:
As the amount of SBS added increases, the impact strength and elongation at break of the blended material increase gradually, and the tensile strength, flexural strength, modulus and hardness decrease.
14, PP / SBR blending modification
formula:
Resin PP 60; crosslinker BP0 3; toughener powder styrene butadiene rubber (SBR) 14; lubricant stearic acid 0.8; antioxidant 168 0.2; filler nano calcium carbonate 20; beta crystal nucleating agent 2
Processing technology:
Weigh PP, SBR and filler according to the formula ratio, put it into high-speed mixer, mix and stir evenly, discharge; nucleating agent, cross-linking agent, antioxidant, lubricant are weighed according to the formula ratio, mix and stir evenly; then The two mixed materials are added together in a high-speed mixer for thorough mixing, and the mixed materials are added to a twin-screw extruder for kneading, extruded and cooled by a twin-screw extruder, and granulated by a pelletizer. Barrel temperature: 195°C in one zone, 200°C in the second zone, 205°C in the third zone, 200°C in the four zones, 195°C in the five zones; screw speed is 300 r/min
performance:
The tensile strength was 35.8 MPa; the elongation at break was 12.3%, the bending strength was 34.2 MPa; and the notched impact strength was 15.4 KJ/m2.
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