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ProductsWith a number of twin screw granulation production lines, R & D and production of PA, PP two series of modified engineering plastics are widely used in automotive parts, toys, electronic products and other industries.
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Application areasWith a number of twin screw granulation production lines, R & D and production of PA, PP two series of modified engineering plastics are widely used in automotive parts, toys, electronic products and other industries.
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ServiceRespect customers, understand customers, continue to provide products and services that exceed customer expectations, and be customers' eternal partners. This is the service concept we have always adhered to and advocated. Wi
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Complete knowledge of PP modification (including formulas)
Release time：
2023-02-13
PP is a commonly used plastic raw material and one of the commonly used modification materials. Its modification methods can be divided into four types: filling modification, strengthening and toughening modification, blending modification, and functional modification. Below is a detailed introduction for you.
PP is a commonly used plastic raw material and one of the commonly used modification materials. Its modification methods can be divided into four types: filling modification, strengthening and toughening modification, blending modification, and functional modification. Below is a detailed introduction for you.
Reinforcement materials: glass fiber, asbestos fiber, single crystal fiber, beryllium, boron, silicon carbide, etc. In addition, when mica and talc powder in filler modification are well treated, they can also be used as reinforcement materials.
Precautions for toughening formula design:
1. The compatibility between elastomers and resins is better. The polarity of plastics is as follows: cellulose plastics>PA>PF>EP>PVC>EVA>PS>PP/HDPE/LDPE/LLDPE; The polarity size of the elastomer is: nitrile rubber>chloroprene rubber>styrene butadiene rubber>cis-1,4-polybutadiene rubber>natural rubber>ethylene-propylene rubber. High polarity resins use high polarity elastomers, while low polarity resins use low polarity elastomers.
2. Compatibilizer: Appropriate compatibilizers can improve the compatibility of the two. Commonly used compatibilizers are maleic anhydride or acrylic acid grafted resins or toughening agents.
3. Synergistic effect of elastomers: Adding different types of elastomers together can have a synergistic effect. For example, in the PP toughening formula, the composite addition of EPDM and ABS has a good toughening effect.
4. Other factors to consider: transparency level - MBS; Flame retardant grade - CPE; Weather resistance level - CPE, ACR, EVA; Low cost - CPE and EVA; The order of prices for different elastomers is: MBS>ACR>ABS>NBR>CPE>EVA.
5. Rigidity compensation: In order to compensate for the loss of rigidity, rigid fillers such as calcium carbonate, talc powder, and mica powder need to be added to the formula; Rigid organic resins such as AS and PMMA can also be added to the elastomer toughening system.
6. The amount of elastomer added: Generally, there is an optimal value for the amount of elastomer added. When adding MBS to PVC, the maximum value is 15%.
7. Collaborative addition of processing aids: For toughening formulas with a large amount of elastomer addition, except for ACR elasticity, it can increase the viscosity of the melt. For this reason, most lubricants or processing aids need to be added to improve their processing performance.
8. Particle size of elastomer: The particle size of elastomer has a significant impact on the toughening effect. According to the toughening theory of elastomers, the particle size of brittle resins such as PS and PP can be relatively larger; For resins with better toughness, such as PVC, POM, PET, etc., the particle size of the elastomer can be relatively small.
Example of Formulation Design for Inorganic Rigid Particle Toughening
O PP/calcium carbonate toughening system
After efficient activation treatment with 1250 mesh calcium carbonate through an alkyl carboxylate coupling system, the impact strength of the composite material can be increased by more than 10% when 20% is added to PP (2401). For this system, if the main coupling agent alkyl carboxylate is used for treatment while the auxiliary coupling agent modified paraffin or EPDM is used for treatment, the impact strength of the composite material will be increased by more than 20% when the amount of calcium carbonate added reaches 30%. PP/kaolin toughening system
Using a modified epoxy resin based interface modifier for high
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