Pelletizing Phosphite Stabilizer with Copolymer Aid
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Solution Overview
Problem
Current methods for incorporating polymer stabilizers, such as tris(2,4-ditert-butylphenyl) phosphite, into polymers face challenges including dust generation during handling, uneven distribution, and temperature exposure, leading to inefficiencies and product instability during processing.
Innovation Solution
A method involving the production of pellets using a mixture of 87-97% tris(2,4-ditert-butylphenyl) phosphite and 3-13% propylene-ethylene copolymer processing aid, compacted and comminuted in a pellet mill to create a stable, dust-free dosage form that minimizes temperature exposure and ensures homogeneous distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polymer stabilizer is handled as powder, then it is easy to handle and dose, but dust is generated during handling and incorporation
Solution Approach 1:
The patent changes the physical state parameter of the polymer stabilizer from powder to pellet form. This parameter change eliminates dust generation during handling while maintaining ease of operation, as pellets can be easily dosed and incorporated into polymers without generating harmful dust particles.
Solution Approach 2:
The patent utilizes phase transition by converting the stabilizer from a powdered solid state to a pelleted solid state through melting and molding processes. This phase transition approach allows the stabilizer to be formed into dust-free pellets that are easier to handle and incorporate into polymer products.
2Stability of the object's composition
If polymer stabilizer is incorporated during processing at high temperature, then homogeneous distribution is achieved, but the stabilizer is exposed to high temperature for extended periods
Solution Approach 1:
The patent applies preliminary action by pre-incorporating the polymer stabilizer into pellets before the actual polymer processing. The stabilizer is already mixed with the polymer matrix in pellet form, so during extrusion or molding, the distribution is automatically homogeneous without requiring extended high-temperature exposure, thus reducing thermal degradation.
Solution Approach 2:
The patent uses the polymer matrix itself as an intermediary carrier. The stabilizer is embedded within the polymer matrix in pellet form, which acts as a medium to distribute the stabilizer homogeneously during processing without requiring prolonged high-temperature exposure, thereby minimizing temperature-related degradation.
3Productivity
If continuous dosing of powder stabilizer is used, then processing is efficient, but fluctuations in the incorporated amount occur
Solution Approach 1:
The patent changes the physical form parameter from powder to pellets with standardized sizes and shapes. This parameter change allows for precise dosing control during continuous processing, eliminating fluctuations in incorporated amount while maintaining high processing efficiency through automated pellet feeding systems.
Solution Approach 2:
The patent segments the stabilizer into discrete, uniform pellets with consistent dimensions. This segmentation allows each pellet to be dosed individually and uniformly during continuous processing, ensuring precise and consistent incorporation amounts without the fluctuations that occur with powder dosing.
4Object-generated harmful factors
If processing aid is added to form pellets, then dust-free handling is achieved, but the composition becomes more complex
Solution Approach 1:
The patent uses a processing aid as an intermediary substance that facilitates pellet formation without significantly complicating the final composition. The processing aid enables the formation of dust-free pellets while being used in small amounts, thus achieving dust-free handling with minimal impact on compositional complexity.
Solution Approach 2:
The patent creates a composite pellet structure combining the polymer stabilizer with a processing aid. This composite material approach allows for dust-free handling and improved processability while the relatively small amount of processing aid (3-13 wt.%) minimizes the increase in compositional complexity.
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 method results in a stable, dust-free pellet form that maintains the polymer stabilizer's effectiveness, reducing dust-related hazards and ensuring consistent distribution within the polymer, thereby enhancing processing efficiency and product stability.
Implementation Method 1
a processing aid, which is a propylene-ethylene copolymer and which possesses a melting enthalpy below 100 J/g at 101.32 kPa
Implementation Method 2
pressing a mixture for compaction, which comprises a polymer stabilizer, which is tris(2,4-ditert-butylphenyl) phosphite, and a processing aid, through a nozzle of a pellet mill
Data Source
AI summary
The invention relates to a method for manufacturing a pellet in a pellet mill, which method comprises the steps of(A) pressing a mixture for compaction by a roller through a nozzle to obtain a strand, and(B) comminuting the strand to obtain the pellet,wherein the mixture for compaction comprises(i) 87 to 97 wt. % of a polymer stabilizer, which is tris(2,4-ditert-butylphenyl) phosphite (CAS-No. 31570-04-4), and(ii) 3 to 13 wt. % of a processing aid, which is a propylene-ethylene copolymer and which possesses a melting enthalpy below 100 J/g at 101.32 kPa.The pellet is useful for a dust-free handling of its polymer stabilizer at a manufacturing of the stabilized polymer. Furthermore, a method for stabilizing a polymer, which is a polyolefin, a polystyrene or a mixture thereof, is disclosed, which comprises the dosing of the pellet to the polymer.