One-Component Adhesive Primer for Liquid Plastics and Mixed Surfaces
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Solution Overview
Problem
Existing adhesion primers struggle to provide a permanent and force-fitting bond between liquid plastics and construction plastics, particularly non-polar plastics and those with recycled content, under varying weather conditions, leading to issues like leaks in connection areas.
Innovation Solution
A one-component adhesion primer composition comprising a prepolymer with free isocyanate groups, chlorinated polyolefins, and organic solvents, specifically formulated to enhance adhesion to both polar and non-polar plastic surfaces, including those with recycled content, without the need for intermediate coats or complex application processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorinated polyolefins are used as adhesion primers for non-polar plastics, then adhesion to non-polar plastics is improved, but adhesion to polar plastics and plastics with recycled content deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the adhesion primer by incorporating polyether-modified polyisocyanates with specific NCO content (7-18%) and using polyoxyalkylene polyols with controlled hydroxy functionality (1.5-4) and equivalent weight (≥400 g/mol). This parameter optimization enables the primer to achieve balanced adhesion across different plastic types including non-polar, polar, and recycled plastics.
Solution Approach 2:
The patent creates a composite adhesion primer system combining polyether-modified polyisocyanates, polyoxyalkylene polyols, and chlorinated polyolefins. This composite formulation leverages the complementary properties of each component: the polyisocyanate provides reactive groups for bonding, the polyoxyalkylene polyol ensures compatibility with various plastic surfaces, and the chlorinated polyolefin enhances adhesion to non-polar plastics, achieving universal applicability.
2Ease of operation
If universal adhesion primers are used to bond liquid plastics to various plastic surfaces, then ease of operation is improved, but adhesion performance deteriorates
Solution Approach 1:
The patent develops a universal adhesion primer that performs multiple functions: it bonds to non-polar plastics (FPO, TPO, EPDM), polar plastics (PVC, ABS), and plastics with recycled content. The primer achieves this through its dual mechanism of chemical bonding via isocyanate groups and physical adhesion through polyoxyalkylene chains, eliminating the need for multiple specialized primers while maintaining reliable adhesion across all substrate types.
3Reliability
If aqueous two-component primers are used for adhesion bonding, then adhesion to plastic surfaces is improved, but processing time and suitability for construction site conditions deteriorate
Solution Approach 1:
The patent extracts the water component from the primer system, creating a purely organic solvent-based formulation. This extraction eliminates the issues associated with aqueous systems including extended processing times, weather sensitivity, and incompatibility with certain plastic surfaces. The organic solvent system provides rapid evaporation and curing while maintaining adhesion performance across diverse construction site conditions.
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 primer composition achieves excellent adhesion to a wide range of plastic surfaces, including non-polar and recycled plastics, with improved durability and ease of use under construction site conditions, reducing leaks and enhancing the longevity of waterproofing connections.
Implementation Method 1
one-component, moisture-curing waterproofing compounds based on silane-terminated polymers can be used particularly advantageously as reactive liquid plastics
Implementation Method 2
Chlorinated polyolefins are typically used as adhesion primers or as components of adhesion primers
Data Source
AI summary
Adhesive primer composition for combination with liquid plastics in the construction sector containing at least A1) at least one prepolymer containing free isocyanate groups and having a content of aliphatically bound NCO groups of 7.0 to 18% by weight, obtainable by reacting aliphatic di- or polyisocyanates with at least one polyoxyalkylene polyol obtainable by alkoxylation of hydroxy-functional starter molecules and having an average hydroxy functionality of 1.5 to 4 and an equivalent weight of at least 400 g/mol A2) at least one chlorinated polyolefin -CPO- having a chlorine content of 10 to 45% by weight based on the total weight of CPO A3) at least one organic solvent containing aromatic hydrocarbons and/or esters, wherein components A1, A2 and A3 are present as a mixture in a single chamber of a closed mixing vessel for storage.