PP blending modified formula

- Jul 19, 2017-

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Polypropylene is one of the most commonly used general-purpose plastics, but the higher crystallinity also causes the low temperature toughness of PP, the shrinkage of molding and the large gap and so on, which limits its wider application to a certain extent. Blending Modification is the most effective way to PP toughening. It is the use of the compatibility between components or the principle of reaction blending, two or more polymers and additives at a certain temperature for mechanical blending, and ultimately the formation of a macroscopic uniform, microscopic Phase separation of new materials. Through the PP of the cohesive nature, can make its comprehensive performance greatly improved, and engineering plastics and polymer alloys in many applications in the field of competition.


Modified effectModified additives
Improve low temperature impactAPK,EPDM,POE,EVA,SBS
Improve transparencyLDPE,APK,POE
Improve coloring

Nylon,PU,Polyacrylamide,Polyacrylate,

Polyvinylidene chloride

Improve air tightnessNylon,PC
Improved antistatic propertiesPVA


The next is the dry goods full of specific modified formula and process it!

1, PP / LDPE blending modification

Recipe

Resin PP100; compatibilizer PE-g-MAH5; LDPE20; lubricant HSt0.3;

Processing technology

The PP and PE, compatibilizer and additives according to the proportion of formula, stirring, extrusion granulation, made of modified materials. Extruder barrel temperature: a section of 210 ℃, two 215 ℃, three 210 ℃; screw diameter to diameter ratio of 25: 1; screw speed of 120 ~ 160r / min.

Performance

PP and PE blends, can improve the toughness of PP, increase the impact strength of low temperature drop ball. The yield stress of the blending material is 13.6MPa, the yield strain rate is 12.3%, the fracture stress is 4.78MPa, and the fracture strain rate is 114.6%.

2, PP / HDPE blending modified

Recipe

Resin PP57.35; Antioxidant 10760.2; HDPE40; PEPQ0.2; Crosslinking agent tert-butyl peroxyisopropylbenzene 0.15; Processing aid Magnesium stearate 0.1; Filler Wollastonite 2;

Processing technology

At room temperature and pressure, the components were mixed in a high-speed mixer for 10 min according to the formulation ratio, and then melt-blended and extruded and granulated using a twin-screw extruder. Extrusion temperature 150-220 ℃, screw speed of 300r / min, by pelletizing, drying process made of PP / HDPE blending modified materials.

Performance

Tensile strength 34.8MPa, cantilever impact strength of 49.3J / m. The surface of the material extinction effect is good, can be used for packaging, daily necessities and building materials and other fields.

3, PP / LLDPE blending modification

Recipe

(DPF30R) 60-70; titanate coupling agent (ND2-311) amount; LLDPE15-20; antioxidant toughener POE (8150) 5 ~ 10; light stabilizer amount; filler talc Average particle diameter 12 μm) 10 to 15;

Processing technology

The high-speed mixer was preheated to 110 ° C. A certain amount of inorganic filler was added. After 15 min at low speed, the coupling agent with a mass fraction of 2% was added three times. After adding coupling agent, the mixture was stirred for 5 min at high speed and then released Fill the spare. According to the proportion of the formula accurately weighed PP, PE, POE, fillers and other additives, mixed into the twin-screw extruder hopper, extrusion granulation.

Extrusion temperature 190-220 ℃, the main screw speed 200r / min, feeding screw speed 20r / min. The pellets are dried and injected into the desired product. The injection temperature is 190-210 ℃, the injection and packing pressure is Mpa, and the pre-plastic pressure is 6MPa.

Performance

The use of PP and LLDPE blends, can improve the toughness of PP and resistance to environmental stress cracking, while adding POE toughening, so that the toughness of the blend significantly increased; with talcum powder to ensure that the material has sufficient rigidity. Its tensile strength ≥ 26MPa, elongation at break ≥ 400%, bending elastic modulus ≥ 1.6GPa, heat distortion temperature ≥ 110 ℃, molding shrinkage 1.15%. This product is mainly used for light car door liner material.

4, super tough PP / POE blending modification

Recipe

PP (K7730) 329; PP (K8303) 120; PP (2401) 90; toughening agent POE (8150) 256; antioxidant 10101.2; antioxidant DLTP2.4; lubricant ZnSt2.4; colorant carbon black 0.5;

Processing technology

First, the components according to the proportion of formula, into the high-speed mixer in the low-speed stirring 1min, and then high-speed stirring 1min, the material, into the twin-screw extruder, mixed extrusion granulation. The twin-screw extruding granulation adopts a medium-shearing screw combination, the temperature of each section is: the first section is 180 ℃, the second section is 195 ℃, the third section is 210 ℃, the fourth section is 220 ℃, the fifth paragraph 235 , Head 230 ℃, screw speed 350r / min

Performance

Tensile strength of 17MPa; breaking elongation of 500%; bending strength of 18MPa; bending elastic modulus of 700MPa; cantilever notched impact strength (room temperature) 750J / m, (- 40 ℃) 320J / m; heat distortion temperature (1.82MPa) 102 ° C.

5, PP / HDPE / POE blending modification

Recipe

Copolymer PP (V30G) 15; Titanate Coupling Agent 0.2; HDPE (8920) 20; 20 Dispersant Liquid Paraffin 0.1; Toughener POE15;

Processing technology

CaCO3 was first dried at 110 ℃ for 4h, and then mixed into the high-speed mixer for 1min according to the proportion of the mixture. Then, the titanate coupling agent and the dispersant were mixed at low speed for 3min to carry out 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 activation of CaCO3 mixed mixing evenly, mixing temperature of 100 ~ 105 ℃, the time is 5min. Finally, extruded with φ58 twin screw extruder granulation. Extrusion temperature 210 ℃, screw speed 140r / min.

Performance

Tensile strength of 18.5MP, fracture strain rate of 61%, notched impact strength of 32.0kJ / m2. The reinforcing effect of talc powder in PP modified is better than that of CaCO3, but it has higher plasticity and toughness retention rate. Compared with EPDM, POE toughening effect is better.

6, PP / HDPE / EPDM blending modification

Recipe

Resin PP100; toughener EPDM15%; HDPE20; lubricant HSt0.4;

Processing technology

PP, HDPE, EPDM and lubricants were added to the high-speed mixer together according to the proportion of the recipe. The mixing and stirring temperature was 100 ~ 105 ℃ and the time was 5min. And then extruded with an extruder for granulation. Extruder aspect ratio of 25: 1; cylinder temperature is a section of 170 ~ 175 ℃, two paragraphs 180 ~ 190 ℃, three 200 ~ 210 ℃, four 210 ~ 220 ℃; screw speed 60 ~ 100r / min.

Performance

Tensile strength of 27.5MPa; bending strength of 34.2MPa; notched impact strength of 24.8KJ / m2. EPDM has similar solubility parameters and surface tension values to PP, and it can be considered that the two have some compatibility and good compatibility and toughening.

7, PP / HDPE / EVA blending modified

Recipe

(HD) (5000s) 10; Stabilizer BaSt0.3; Lubricant HSt0.5;

Processing technology

According to the formula ratio of each material in order to join the high-speed mixer, high-speed mixing 10min, the temperature of 90 ~ 100 ℃, the active CaCO3 powder, HDPE, EVA and PP powder can be mixed evenly expected.

The mixed material is extruded with a φ45 extruder, and the die extruded material is cooled by a water tank, air cooled and then traversed into a pelletizer. Extruder cylinder: feeding section 80-100 ℃, compression section 170 ~ 180 ℃, homogenization section 180 ~ 190 ℃, die temperature 190 ℃; screw speed 60 ~ 120r / min.

Performance

Tensile strength 25.5MPa; bending strength 38.9MPa; elongation at break 255%; notched impact strength 9.1kJ / m2; heat distortion temperature (18.6MPa) 59 ℃. EVA modified PP material impact performance is high, good toughness, high gloss, low cost, in engineering has broad application prospects.

8, PP / PS blending modification

Recipe

Resin PP100; PS10; compatibilizer SBS10; lubricant HSt0.4;

Processing technology

The components were weighed according to the proportion of the recipe, mixed into a high-speed mixer, mixed and uniformly discharged, and then extruded and extruded in an extruder. Extrusion temperature 170-230 ° C.

Performance

Yield strength of 29.2MPa; elongation at break 7%; elastic modulus of 1432MPa; impact strength of 27kJ / m2.

PP and PS are incompatible system, and SBS to join, reducing the size of the dispersed phase, to promote uniform dispersion of the system, which play a role in toughening and compatibility.

9, PP / HIPS blending modification

Recipe

Resin PP51.8; nucleating agent sodium phosphate 0.1; HIPS18; dicycloheptane dicarboxylate 0.1; filler talc 30;

Processing technology

The components were weighed according to the proportion of the recipe, mixed into a high-speed mixer, mixed and uniformly discharged, and then melt-extruded and extruded in a twin-screw extruder. Extrusion temperature 190 to 210 ° C, screw D / L ≥ 32.

Performance

The material has the advantages of low linear expansion coefficient, and has the uniformity, the dimensional stability of the parts, the assembly gap is small, to meet the car in different temperature environment.

10, PP / PA66 blending modification

Recipe

Resin PP100; compatibilizer PP-g-MAH10; PA6620; additives 0.2;

Processing technology

The PP, PA and additives in the high-speed mixer mixing, and then extrusion granulation. Mixing temperature 80-100 ℃, stirring time 10min; extrusion temperature of 200-245 ℃, screw speed 60-120r / min

Performance

PA66 and PP blends, the impact strength of the blended material at room temperature and low temperature is greatly improved. After the incorporation of 10% PP-g-MAH, the notched impact strength of the blend reaches 108.9J / m2; Strength 38.8MPa; elastic modulus 1710Mpa; breaking elongation of 37%.

11, PP / PET blending modification

Recipe

Resin PP100; nucleating agent 0.1; PET15; compatibilizer PP-g-AA5;

Processing technology

The components were weighed according to the proportion of the recipe, placed in a high-speed mixer, mixed and mixed, discharged, and then melt blended in the extruder. Extruder L / D is 25: 1; barrel temperature 200-230 ℃, screw speed 60-100r / min.

Performance

Tensile strength 34.2MPa; bending strength 63.1MPa. PET and PP blending, PET can improve the shortcomings, but also can improve, but also can improve the impact strength and mechanical properties of PP. But the polarity difference between the two resins is large, PET is a polar polymer, PP is a non-polar polymer, the compatibility of the two poor. Addition of PP-AA5 can significantly improve the compatibility between the two.

12, PP / PBT blending modification

Recipe

Resin PP100; PBT20; lubricant EBS0.5; compatibilizer E / EA / GMA5;

Processing technology

The components were weighed according to the proportion of the recipe, placed in a high-speed mixer, mixed and mixed, discharged, and then melt blended in the extruder. Extruder L / D ≥ 20: 1; barrel temperature 190 ~ 230 ℃; screw speed 100 ~ 160r / min.

Performance

Tensile strength of 37.2MP; bending strength of 76.5MPa; impact strength of 10KJ / m2. PBT is a polar polymer, and PP is a non-polar polymer, which is incompatible between the two, using E / EA / GMA compatibilizer to improve the interface adhesion, play a good compatibility.

13, PP / SBS blending modification

Recipe

Resin PP100; Toughening agent SBS20; Antioxidant 1520-D0.4; Lubricant EBS0.2;

Processing technology

The components were weighed according to the proportion of the recipe, placed in a high-speed mixer, mixed and mixed, discharged, and then melt blended in the extruder. The extruder has an aspect ratio of 25: 1: extrusion temperature of 155-215 ° C; screw speed of 100 to 160 r / min.

Performance

With the increase of SBS content, the impact strength and elongation at break increased gradually, and the tensile strength, flexural strength, modulus and hardness decreased.

14, PP / SBR blending modification

Recipe

Resin SB60; crosslinking agent BP03; toughener powder SBR 14; lubricant stearic acid 0.8; antioxidant 1680.2; filler nano calcium carbonate 20; β crystal nucleating agent 2

Processing technology

The PP, SBR and filler according to the proportion of formula, into the high-speed mixer mixed mixing evenly, the material; the nucleating agent, crosslinking agent, antioxidant, lubricant according to the proportion of formula, mixing evenly; The two mixes were mixed together in a high-speed mixer to mix thoroughly. The mixed materials were kneaded in a twin-screw extruder, extruded through a twin-screw extruder, and pelletized by a pelletizer. Barrel temperature: a district 195 ℃, two 200 ℃, three 205 ℃, four 200 ℃, five districts 195 ℃; screw speed of 300r / min

Performance

Tensile strength 35.8MPa; breaking elongation 12.3%, bending strength 34.2MPa; notched impact strength 15.4KJ / m2.


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