Polyester Resin Dispersant for Calcium Carbonate in Thermoplastics
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Solution Overview
Problem
Calcium carbonate, with its hydrophilic surface, often fails to disperse effectively in thermoplastic resins like polyolefin and PET resins, leading to poor performance in applications such as LCD reflectors and porous films due to inadequate shielding, light reflection, and uniform void formation.
Innovation Solution
A linear polyester resin with aromatic dicarboxylic acid and aliphatic diol residues, having a melting point of 100 to 250°C, is used as a dispersant in small amounts (0.05 to 5 parts by mass based on 100 parts of calcium carbonate, improving dispersion and producing well-dispersed calcium carbonate in thermoplastic resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If calcium carbonate is mixed with thermoplastic resin without a dispersant, then the resin composition can be prepared with simple formulation, but calcium carbonate undergoes dispersion failure and does not disperse properly in the resin
Solution Approach 1:
The patent introduces a polyester resin as an intermediary dispersant between calcium carbonate and thermoplastic resin. The dispersant contains carboxyl groups that chemically interact with calcium carbonate particles, acting as a mediator to improve dispersion. This resolves the contradiction by adding a intermediate substance that facilitates proper dispersion without requiring complex processing equipment or procedures.
Solution Approach 2:
The patent optimizes specific parameters of the polyester dispersant including carboxyl group content (0.5-5.0 mmol/g), molecular weight (1,000-10,000), and melting point (80-200°C) to achieve effective dispersion. By carefully controlling these parameters, the dispersant effectively bridges calcium carbonate and resin without requiring complex formulation processes.
2Manufacturing precision
If a conventional dispersant (polyester from trimethylol propane, adipic acid, and stearic acid) is used, then dispersion is improved to some extent, but calcium carbonate dispersion remains insufficient and functions are not fully available
Solution Approach 1:
The patent modifies key parameters of the polyester dispersant: using dicarboxylic acids with higher carboxyl group density (0.5-5.0 mmol/g), controlling molecular weight (1,000-10,000), and adjusting melting point (80-200°C). These parameter changes enhance the dispersant's ability to coat calcium carbonate particles effectively, ensuring both good dispersion and reliable functional performance in applications like LCD reflectors and porous films.
Solution Approach 2:
The patent creates a composite system consisting of calcium carbonate, thermoplastic resin, and optimized polyester dispersant. The dispersant forms a composite interface between the inorganic filler and organic resin, improving both dispersion quality and functional reliability simultaneously.
3Reliability
If calcium carbonate is poorly dispersed in resin, then the resin composition can be prepared with simple mixing, but the molded body exhibits poor appearance and insufficient shielding, light reflection, and light scattering functions
Solution Approach 1:
The patent applies preliminary action by pre-coating calcium carbonate particles with the polyester dispersant before mixing with the thermoplastic resin. This preliminary coating ensures that when the mixture is processed, the calcium carbonate is already properly dispersed and ready to perform its functions (shielding, light reflection, scattering) effectively, without requiring complex processing steps.
4Manufacturing precision
If calcium carbonate is used in porous film production, then the film can be produced with standard processing, but open voids are not uniformly generated and uniform properties are difficult to achieve
Solution Approach 1:
The polyester dispersant acts as an intermediary that uniformly distributes calcium carbonate particles throughout the resin matrix before film formation. This uniform distribution ensures that when pores form during processing, they are evenly distributed throughout the film, achieving uniform properties without requiring complex processing equipment or methods.
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 use of this polyester resin dispersant enables the production of molded bodies with improved calcium carbonate dispersion, suitable for LCD reflectors and porous films with uniform properties, enhancing mechanical strength, heat resistance, and oil resistance.
Implementation Method 1
a linear polyester resin that has an aromatic dicarboxylic acid residue and an aliphatic diol residue in the main chain and has capped ends and that has a melting point in the range of 100 to 250° C. can function as a dispersant in dispersion of calcium carbonate in a thermoplastic resin
Data Source
AI summary
Provided are: a dispersant for calcium carbonate that is capable of dispersing calcium carbonate well in a thermoplastic resin; a calcium carbonate composition and a thermoplastic resin composition that each contain the dispersant for calcium carbonate; and a molded body produced by using the thermoplastic resin composition. Specifically, provided are a dispersant for calcium carbonate, including a polyester resin containing an aromatic dicarboxylic acid residue, an aliphatic diol residue, and a monoalcohol residue or a monocarboxylic acid residue and having a melting point of 100 to 250° C.; a calcium carbonate composition that contains the dispersant and calcium carbonate; a thermoplastic resin composition that contains the dispersant, calcium carbonate, and a thermoplastic resin; and a molded body that contains the thermoplastic resin composition.