1Introduction

InPVCIn the application of modified materials, "high brittleness and easy fracture" are repeated problems encountered by many enterprises in the production process. Especially in pipes, profilescableIn fields such as protective sheaths, if the material's toughness is insufficient, it not only affects processing stability, but also shortens the product's service life and even poses safety hazards.

So, why do PVC modified materials become brittle? How can we systematically solve it?

2Comprehensive Analysis of Brittle Causes and Effects

PVC material itself has high rigidity, but due to its regular molecular chain structure and strong polarity, its natural toughness is relatively insufficient. During the modification process, if the formula system design is not reasonable, it is easy to magnify the brittleness problem of the material, which gradually becomes apparent in the processing and application stages.

　　plasticizerLow proportion or uneven dispersion

It will cause the glass transition temperature of the material to be higher and the flexibility to decrease, especially in low-temperature environments.

　　Excessive filler addition ratio or improper particle size control

It will weaken the interfacial bonding strength between the matrix and the filler, form stress concentration points, and become a source of crack propagation.

　　Crosslinking system or stable system controls imbalance

It will restrict the movement of molecular chains, causing an increase in material hardness and a decrease in toughness.

The above factors often do not exist alone, but rather overlap with each other, ultimately resulting in decreased impact resistance, increased risk of low-temperature brittle fracture, easy particle breakage during processing, and poor plasticization effect. In the application fields of pipes, profiles, cable sheaths, and building materials, excessive brittleness not only shortens the service life of products, but also may cause crack propagation and structural failure, affecting the long-term safety and reliability of products.

　　Adjust the proportion of plasticizers

Moderate increase in the use of plasticizers, especially those with good low-temperature plasticizing effects, such as citrate esters, adipic acid, succinic acid, and other environmentally friendly plasticizers with good low-temperature plasticizing effects, can improve the flexibility and impact resistance of materials.

　　Reasonably control the amount of filler used

Reasonably control the usage of fillers according to the application scenario. Generally speaking, the proportion of fillers should not be too high, otherwise it will affect the toughness of the material. Surface modified ultrafine fillers can be selected to optimize the particle size distribution of fillers, enhance the interfacial bonding strength with PVC matrix, and reduce the negative impact on material toughness.

　　Control cross-linkingagentdosage

If crosslinking agents are used to improve the heat resistance, mechanical strength, and other properties of materials, their dosage should be strictly controlled to avoid excessive crosslinking that limits the movement of molecular chains and significantly reduces the toughness of the material.

4Core advantages strike the pain points and comprehensively solve the problem of PVC brittleness

Focusing on the causes of PVC brittleness, Tongxiang Xiaobaozi's PVC modified particles have made multidimensional breakthroughs in formula research and development, process control, and performance optimization, systematically solving industry problems such as poor compatibility of toughening agents, imbalanced plasticizer ratios, excessive fillers, and improper cross-linking control, achieving dual improvement in material properties and processing efficiency.

　　1. High impact toughness, solving the problem of low-temperature brittle fracture

Selected high compatibility toughening system, scientifically optimized synergistic system of plasticizer and toughening agent, precise control of crosslinking reaction, the product maintains excellent impact resistance in low temperature environment. After standard testing, the material still has no brittle fracture after cantilever beam impact test in -40 ℃ low temperature environment, greatly improving the service life of the end product.

　　2. Mature formula system, stable and consistent batches

Based on years of experience in PVC modification research and development and standardized quality control processes, we conduct layer by layer testing from raw materials to finished products to ensure formula stability and consistent performance, reduce customer repeated debugging costs, and ensure continuous and stable production.

　　3. Excellent processing performance, reducing equipment burden

Adopting advanced twin-screw granulation technology, the particles have good flowability and the material itself has strong thermal stability. Based on actual process adjustments, the processing temperature has wide adaptability. When processing at high temperatures below 180 ℃, it has strong thermal stability, no coking, and low moisture absorption of particles, which can avoid drying and effectively avoid extrusion fluctuations and equipment blockage problems, thus improving production efficiency.

　　4. Scenario based customization, accurately matching industry needs

For application scenarios such as pipes, door and window profiles, cable sheaths, etc., customized low-temperature impact resistant, high tensile or high filling stability solutions can be provided to ensure rigidity while maximizing toughness.

5Conclusion

The brittleness of PVC modified materials is too high. In addition to the problem of a single raw material, there are also system design issues. Only by optimizing the formula structure, material compatibility, and processing stability in multiple directions can performance upgrades be truly achieved.