Rigid IPVC Pipe Resin Composition for Hydrostatic Pressure Resistance
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Solution Overview
Problem
PVC pipes suffer from limitations in impact and tensile strength, leading to breakage and bursting issues when used in engineering and construction, due to the inverse relationship between these properties, necessitating a resin composition that enhances both strengths while providing hydrostatic pressure resistance.
Innovation Solution
A rigid IPVC pipe resin composition is developed, comprising a PVC resin with a K-value from 72 to 84, combined with 1-3 parts by weight of a tin stabilizer, 3-10 parts by weight of an impact modifier, and 1-10 parts by weight of a methacrylate lubricant, specifically butyl methacrylate and methyl methacrylate, to achieve excellent tensile strength, impact resistance, and hydrostatic pressure resistance without using plasticizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVC resin with high molecular weight is used, then mechanical properties are improved, but processability deteriorates
Solution Approach 1:
The patent changes the K-value parameter to 72-84, indicating high molecular weight resin selection, which improves mechanical properties while the added lubricants compensate for processing difficulties
Solution Approach 2:
The patent introduces methacrylate lubricants as intermediary substances that mediate between the high molecular weight PVC resin and the processing equipment, enabling extrusion despite the resin's inherently poor processability
Solution Approach 3:
The patent creates a composite resin system that combines high K-value PVC resin with process aids including tin stabilizers and methacrylate lubricants to achieve both superior mechanical properties and acceptable processability
2Ease of manufacture
If plasticizer is added to enable extrusion of high K-value PVC resin, then processability is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent substitutes traditional plasticizers with methacrylate lubricants that act as intermediaries to enable extrusion without compromising mechanical properties, as lubricants provide processing aid functions without the plasticizing effect that weakens the material
Solution Approach 2:
The patent changes the approach from chemical modification (plasticization) to physical lubrication, using methacrylate compounds that reduce friction during extrusion while maintaining the structural integrity of the high K-value PVC resin
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 composition enables the production of PVC pipes with tensile strengths from 50 MPa to 60 MPa, improved falling weight impact strength, and enhanced hydrostatic pressure resistance, while maintaining economic feasibility and processability, overcoming the challenges of high molecular weight PVC resin processing.
Implementation Method 1
1 part by weight to 10 parts by weight of a methacrylate lubricant
Implementation Method 2
1 part by weight to 3 parts by weight of a tin stabilizer (tin complex)
Implementation Method 3
3 parts by weight to 10 parts by weight of an impact modifier
Data Source
AI summary
Provided are: a rigid IPVC pipe resin composition, which exhibits excellent strength and hydrostatic pressure resistance, including a PVC resin having a K-value from 72 to 84; and a rigid IPVC pipe, which exhibits excellent strength and hydrostatic pressure resistance, manufactured by extrusion of the resin composition.