Succinic Acid Diester Solid Catalyst for Olefin Polymerization
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Solution Overview
Problem
Current solid catalyst components for olefin polymerization, particularly those using phthalate esters, face challenges in achieving high melt flow rates and rigidity while maintaining copolymerization activity and flowability, and are restricted by environmental concerns due to the use of SVHC substances like di-n-butyl phthalate and butyl benzyl phthalate.
Innovation Solution
A solid catalyst component comprising magnesium, titanium, halogen, and succinic acid diester, with a succinic acid diester content of 15.0% by mass or more, a specific molar ratio of succinic acid diester to titanium, and a total pore volume and specific surface area optimized for effective polymerization, is used to produce polymers with high melt flow rates and rigidity, along with improved copolymer block rates and flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phthalate esters are used as internal electron-donating compounds in solid catalyst components, then high polymerization activity and tacticity are achieved, but environmental concerns arise due to SVHC substance restrictions
Solution Approach 1:
The invention changes the chemical parameter by substituting phthalate esters with succinic acid diester compounds as internal electron-donating compounds. This substitution maintains the catalytic function while eliminating SVHC substances, thereby resolving the contradiction between polymerization activity and environmental safety
Solution Approach 2:
The invention uses readily available succinic acid diester compounds that are not classified as SVHC substances, replacing the problematic phthalate esters. This allows continued high-performance polymerization without environmental restrictions
2Object-affected harmful factors
If internal electron-donating compounds other than phthalate esters are used, then environmental friendliness is improved, but copolymerization activity and block rate are insufficient
Solution Approach 1:
The invention optimizes the chemical structure parameters of succinic acid diester compounds by controlling the carbon chain length (R3 and R4 groups with 2-4 carbon atoms) and their arrangement. This structural optimization enhances copolymerization activity and block rate while maintaining environmental safety
Solution Approach 2:
The invention creates a composite catalyst system combining magnesium, titanium, halogen, and optimized succinic acid diester compounds. This composite structure synergistically improves copolymerization activity and block rate beyond what simple substitutions achieve
3Object-affected harmful factors
If internal electron-donating compounds other than phthalate esters are used, then environmental impact is reduced, but polymer flowability and copolymer handling are deteriorated due to stickiness
Solution Approach 1:
The invention changes the physical parameters of the copolymer by optimizing the succinic acid diester compound structure, which controls the block rate and molecular weight distribution. This results in copolymers with reduced stickiness and improved flowability for easier handling
Solution Approach 2:
The invention uses feedback from the copolymerization process to optimize the succinic acid diester compound selection. By monitoring block rate and flowability, the invention identifies the optimal compound structure that prevents stickiness while maintaining environmental safety
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 catalyst system effectively produces polymers with melt flow rates of 0.5 g/10 min to 200.0 g/10 min and flexural modulus of 2000 MPa or more, offering excellent rigidity and flowability, while being environmentally friendly by avoiding SVHC substances.
Implementation Method 1
a solid catalyst component for polymerization of an olefin, a method for producing a solid catalyst component for polymerization of an olefin, a catalyst for polymerization of an olefin
Data Source
AI summary
A solid catalyst component for polymerization of an olefin is disclosed including: magnesium, titanium, halogen, and a succinic acid diester compound, wherein a content of the succinic acid diester compound in a total content of the components in terms of the solid content is 15.0% by mass or more, a ratio (S/T), represented by a content of the succinic acid diester compound(S) in the total content of the components to a content of the titanium (T) in the total content of the components, is 0.60 to 1.30 in a molar ratio, and a total pore volume of a diameter of 1 μm or less as measured by a mercury intrusion method is 0.3 to 1.0 cm3/g, and a specific surface area is 200 m2/g or more.