Oxymethylene Copolymer Production via Acid-Base Neutralization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for producing oxymethylene copolymers face challenges in achieving high molecular weight and yield due to the inhibition of polymerization reactions by basic compounds used as stabilizers, which require physical removal or excess initiator usage, leading to economic inefficiencies.
Innovation Solution
A method involving the addition of an acidic compound to the copolymer starting materials containing a basic compound before polymerization, allowing a reaction between them, and conducting the polymerization through melt polymerization with an acidic compound initiator, thereby avoiding the need for physical removal of the basic compound and excess initiator usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical removal of basic compound is performed through distillation, then polymerization inhibition is eliminated, but production cost and process complexity increase
Solution Approach 1:
The harmful basic compound is extracted and neutralized by adding acidic compound (C) before polymerization, converting it into a non-inhibitory form through chemical reaction, thereby eliminating the need for complex distillation processes
Solution Approach 2:
The basic compound is neutralized in advance by adding acidic compound (C) before the polymerization reaction begins, preventing polymerization inhibition from occurring in the first place rather than dealing with it during or after the reaction
2Productivity
If excess polymerization initiator is used to cancel inhibition action, then polymerization proceeds normally, but molecular weight of copolymer decreases
Solution Approach 1:
The harmful basic compound is converted into a beneficial neutral substance through reaction with acidic compound (C), transforming the inhibition problem into a solution that enables normal polymerization with stoichiometric amounts of initiator, thereby maintaining high molecular weight
Solution Approach 2:
Acidic compound (C) acts as an intermediary that reacts with the basic compound to neutralize its inhibitory effect, allowing the polymerization initiator to function effectively without requiring excess amounts that would compromise copolymer molecular weight
3Reliability
If physical removal of basic compound is performed, then polymerization inhibition is eliminated, but production cost increases
Solution Approach 1:
The basic compound is chemically extracted and neutralized by acidic compound (C) through a simple addition process, avoiding costly distillation operations and reducing production costs while maintaining polymerization efficiency
Solution Approach 2:
The basic compound is neutralized in advance by adding acidic compound (C) before polymerization, preventing inhibition and eliminating the need for expensive purification steps, thereby reducing overall production costs
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
This approach enables the production of high molecular weight oxymethylene copolymers at high yield without the economic drawbacks of physical removal or excess initiator use, enhancing both molecular weight and yield while maintaining economic efficiency.
Implementation Method 1
an acidic compound (C) different from the acidic compound (A) is added to the copolymer starting material prior to the polymerization reaction to allow reaction between the basic compound (B) and the acidic compound (C) in advance
Implementation Method 2
cationically polymerizing trioxane and a comonomer at a polymerization temperature of 135-300° C. in the presence of at least one polymerization initiator selected from the group consisting of protonic acids, protonic acid anhydrides and protonic acid ester compounds
Implementation Method 3
the polymerization reaction is carried out through melt polymerization
Data Source
AI summary
The present invention addresses the problem of providing a method for producing an oxymethylene copolymer, which is capable of producing an oxymethylene copolymer having a high molecular weight with high yield and high economic efficiency. This problem is able to be solved by a method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and wherein: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.