Crosslinkable Resin Composition Stabilizer for Extrusion Pressure Control
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Solution Overview
Problem
The existing crosslinkable resin compositions for electric wires/cables face challenges with pressure increase and discharge variation during extrusion molding, leading to unstable coating formation and short production units, along with issues in long-term storage due to bleeding of hindered amine light stabilizers.
Innovation Solution
A crosslinkable resin composition comprising 100 parts of ethylene-based resin, 0.001 to 0.5 parts of a hindered amine light stabilizer as a mixture of low- and high-molecular-weight compounds, 0.5 to 3.0 parts of organic peroxide, and additional stabilizers like hindered phenol and dialkyl thiodipropionate, which maintains reduced viscosity and weight-average molecular weight to prevent bleeding and clogging, ensuring stable extrusion and long-term storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screen mesh with smaller mesh size is used to prevent foreign matter mixing, then the quality of insulating coating layer is improved, but the screen mesh clogs and blocks more quickly, causing pressure increase and stopping extrusion operation
Solution Approach 1:
The patent changes the molecular weight parameter of the hindered amine light stabilizer, using compounds with molecular weight of 1,500 or less (preferably 700 to 1,200). This parameter change reduces the viscosity of the stabilizer, preventing screen mesh clogging while maintaining the ability to prevent foreign matter mixing in the insulating coating layer.
2Reliability
If a crosslinkable resin composition containing hindered amine stabilizer is used, then scorch resistance and color stability are improved, but the stabilizer bleeds out during storage, causing activity decrease and long-term stability issues
Solution Approach 1:
The patent changes the molecular weight parameter of the hindered amine light stabilizer to 1,500 or less (preferably 700 to 1,200). This parameter optimization prevents bleeding during storage while maintaining scorch resistance and color stability, resolving the contradiction between immediate performance and long-term storage stability.
3Reliability
If the production unit length is increased to reduce connecting joints, then the probability of system failure is reduced, but the extrusion pressure increases due to screen mesh clogging, making continuous production difficult
Solution Approach 1:
The patent changes the molecular weight parameter of the hindered amine light stabilizer to 1,500 or less, which reduces the viscosity of the resin composition. This parameter change prevents screen mesh clogging during continuous extrusion, maintaining low extruder pressure and enabling long production units without system failures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition allows for continuous and stable extrusion molding with reduced pressure increase and discharge variation, enabling longer production units and improved long-term storage properties, thereby enhancing the reliability and efficiency of electric wire/cable production.
Implementation Method 1
a crosslinkable resin composition containing an ethylene-based resin, a stabilizer, and an organic peroxide
Implementation Method 2
crosslinking the crosslinkable resin composition to form an insulating coating layer
Implementation Method 3
a hindered amine light stabilizer having a melting point or a glass transition point of 100°C or lower
Implementation Method 4
stabilizer containing 0.001 to 0.5 parts by mass of a hindered amine light stabilizer
Implementation Method 5
coating a conductor with a crosslinkable resin composition by extrusion molding
Implementation Method 6
stable extrusion molding cannot be performed
Data Source
AI summary
An object is to provide a crosslinkable resin composition which does not easily cause an increase in the pressure and a discharge variation in an extruder charged with the crosslinkable resin composition, with which an insulating coating layer can be continuously and stably formed by extrusion molding for a long time, thereby realizing an increase in the production unit of an electric wire/cable. A crosslinkable resin composition of the present invention contains 100 parts by mass of an ethylene-based resin (A), a stabilizer (B) containing 0.001 to 0.5 parts by mass of a hindered amine light stabilizer (B3), and 0.5 to 3.0 parts by mass of an organic peroxide (C). The hindered amine light stabilizer (B3) is a mixture of a low-molecular-weight hindered amine compound having a molecular weight of 100 to 1,000 and a high-molecular-weight hindered amine compound having a molecular weight of 1,500 to 5,000. The hindered amine light stabilizer (B3) has a reduced viscosity of 3.5 to 5.5 cm3/g (40°C) and a reduced viscosity of 2.0 to 3.5 cm3/g (110°C).