Vinyl Chloride Cable Coating with Composite Plasticizers
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Solution Overview
Problem
Conventional cable coating materials fail to provide sufficient long-term reliability and oil resistance, especially when exposed to cutting oils containing surfactants, due to their inability to maintain flexibility and resist degradation.
Innovation Solution
A cable coating material comprising a vinyl chloride resin and a plasticizer mixture with an aliphatic polyhydric carboxylic acid ester and an aromatic polyhydric carboxylic acid ester, where the plasticizer mixture is formulated to include 40 to 80 parts by weight relative to 100 parts of vinyl chloride resin, with the aliphatic ester contributing 40 to 70% and the aromatic ester contributing 30 to 60% by weight, enhancing flexibility and oil resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating materials are used, then basic coating function is provided, but oil resistance and long-term reliability are insufficient when exposed to cutting oils containing surfactants
Solution Approach 1:
The patent uses a composite plasticizer system combining three types of plasticizers (phthalate, phosphate, and polymeric plasticizers) in specific proportions. This composite approach creates synergistic effects where each component contributes different properties: phthalate plasticizers provide base flexibility, phosphate plasticizers enhance flame retardancy and oil resistance, and polymeric plasticizers resist extraction by oils. The combination resolves the contradiction by achieving both flexibility and superior oil resistance that individual plasticizers cannot provide alone.
Solution Approach 2:
The patent specifies precise compositional parameters for the plasticizer mixture, including the types and proportions of different plasticizers (phthalate 20-50%, phosphate 10-30%, polymeric 10-30%). By carefully controlling these parameters, the coating material achieves optimal balance between flexibility and oil resistance. The parameter optimization ensures that the coating maintains its properties when exposed to cutting oils containing surfactants, resolving the reliability-oil resistance contradiction.
2Ease of operation
If plasticizers are added to improve flexibility, then handling ease is improved, but oil resistance deteriorates due to extraction by cutting oils
Solution Approach 1:
The patent introduces polymeric plasticizers and phosphate plasticizers as intermediary substances that resist extraction by cutting oils. These intermediary plasticizers act as a barrier between the conventional phthalate plasticizers and the oil environment, preventing the oil from extracting the flexibility-providing plasticizers. This mediator approach allows the coating to maintain both flexibility (from phthalate plasticizers) and oil resistance (from the extraction-resistant intermediary plasticizers).
Solution Approach 2:
The composite plasticizer system combines multiple plasticizer types with complementary properties. The phthalate plasticizers provide flexibility, while the phosphate and polymeric plasticizers provide resistance to oil extraction. This composite structure resolves the contradiction by distributing functions across different components, allowing the coating to simultaneously achieve ease of operation and reliability in oil environments.
Data Source
Figure 1~2
AI summary
Provided is a cable coating material having high flexibility and excellent oil resistance. The cable coating material is a material containing a vinyl chloride resin and a plasticizer mixture in an amount of 40 to 100 parts by weight relative to 100 parts by weight of the vinyl chloride resin, in which the plasticizer mixture includes an aliphatic polyhydric carboxylic acid ester and an aromatic polyhydric carboxylic acid ester, the aliphatic polyhydric carboxylic acid ester has a weight-average molecular weight of 1000 to 6000, and the content by percentage of the aliphatic polyhydric carboxylic acid ester in the total weight of the plasticizer mixture is 40 to 80% by weight, and the content by percentage of the aromatic polyhydric carboxylic acid ester in the total weight of the plasticizer mixture is 20 to 60% by weight.