Polybutylene Terephthalate Resin Composition Suppressing Mold Release Agent Blooming
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Solution Overview
Problem
Polybutylene terephthalate resin compositions with mold release agents face issues with mold releasability, deformation, and aggregation due to blooming during the drying process, leading to instability and poor feeding in molding operations.
Innovation Solution
A polybutylene terephthalate resin composition combining a saturated fatty acid ester of polyglycerol with a C 19-30 saturated aliphatic acyl group is used, which suppresses blooming and enhances mold releasability, ensuring stable molding and preventing aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mold release agent is combined with polybutylene terephthalate resin to improve mold releasability, then the molded product can be released from the mold, but the mold release agent blooms on the surface of the resin composition during the drying process before molding
Solution Approach 1:
The patent changes the chemical parameters of the mold release agent by specifying a particular ester compound with controlled molecular weight and chemical structure. This parameter change allows the mold release agent to function effectively without blooming during the drying process, resolving the contradiction between mold releasability and compositional stability
Solution Approach 2:
The patent creates a composite resin composition by combining polybutylene terephthalate resin with a specific ester compound as mold release agent. This composite material integrates the mold release function within the resin matrix, preventing blooming while maintaining effective mold releasability
2Ease of operation
If a mold release agent is used to prevent deformation of molded products, then release force is reduced, but the molded product may still be deformed by external force from ejector pin
Solution Approach 1:
The patent optimizes the chemical structure and molecular weight parameters of the ester compound to achieve optimal release characteristics. This parameter optimization reduces release force to a level that prevents both mold adhesion and ejector pin deformation, simultaneously improving ease of operation and manufacturing precision
3Ease of operation
If a mold release agent is combined with polybutylene terephthalate resin to improve mold releasability, then release is facilitated, but aggregation and poor feeding occur during molding operations
Solution Approach 1:
The patent specifies precise parameter ranges for the ester compound including molecular weight and chemical structure, which control the agent's behavior during molding. These parameter changes prevent aggregation and ensure stable feeding while maintaining mold releasability, resolving the contradiction between ease of operation and molding reliability
Data Source
Figure 1
AI summary
Provided are a polybutylene terephthalate resin composition which is excellent in mold releasability and which can suppress deterioration in molding stability and aggregation of the polybutylene terephthalate resin composition due to blooming of a mold release agent; and a pellet thereof. The polybutylene terephthalate resin composition contains 0.01 to 5.0 parts by mass of (B) a saturated fatty acid ester of a polyglycerol represented by formula (I) described below with respect to 100 parts by mass of (A) a polybutylene terephthalate resin. In formula (I), R1s each may be the same or different and are C19-30 saturated aliphatic acyl groups, and n is an integer from 1 to 10.