Acrylic Polymer Plastisol Vibration Damping
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Solution Overview
Problem
Plastisol compositions with acrylic polymers have insufficient vibration damping properties despite good storage stability and chipping resistance.
Innovation Solution
A method for producing an acrylic polymer with specific solubility parameters and glass transition temperatures, combined with a multilayer structure, to enhance vibration damping and chipping resistance in coating films, involving the polymerization of acrylic monomer mixtures with t-butyl methacrylate and methyl methacrylate, and the use of phthalic acid dialkyl ester as a plasticizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If acrylic polymer is used to replace vinyl chloride resin in plastisol composition, then environmental harm is reduced (no hydrogen chloride generation), but vibration damping property becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the acrylic polymer by incorporating specific monomer ratios (methyl methacrylate 68-92% by mol, t-butyl methacrylate 8-32% by mol) and controlling the glass transition temperature (90-110°C). These parameter adjustments enable the polymer to achieve both environmental compatibility and improved vibration damping properties through optimized molecular structure and intermolecular forces.
Solution Approach 2:
The patent creates a composite plastisol composition by combining the specifically formulated acrylic polymer with plasticizers (phthalic acid dialkyl ester) and fillers (mica, wollastonite). This composite approach integrates multiple materials with complementary properties to achieve both environmental performance and enhanced vibration damping characteristics.
2Stability of the object's composition
If acrylic polymer with good storage stability is used, then storage stability is improved, but vibration damping property becomes insufficient
Solution Approach 1:
The patent simultaneously optimizes multiple parameters: the glass transition temperature (90-110°C) ensures storage stability by maintaining appropriate polymer chain mobility, while the specific monomer composition (particularly t-butyl methacrylate content) and molecular weight distribution enable vibration damping. The plasticizer content (30-150 parts by mass per 100 parts polymer) is carefully controlled to balance both properties.
Solution Approach 2:
The patent uses composite material formulation combining acrylic polymer with specific plasticizers (phthalic acid dialkyl ester with 8-12 carbon atoms) and fillers. The plasticizer enhances vibration damping by increasing polymer chain mobility and energy dissipation, while the filler particles (mica, wollastonite) provide structural reinforcement and additional damping mechanisms, achieving both storage stability and vibration damping performance.
3Reliability
If vinyl chloride resin is used in plastisol composition, then vibration damping property is sufficient, but environmental harm increases due to hydrogen chloride generation during recycling
Solution Approach 1:
The patent fundamentally changes the chemical composition from vinyl chloride resin to specifically formulated acrylic polymer with controlled monomer ratios (methyl methacrylate 68-92% by mol, t-butyl methacrylate 8-32% by mol) and glass transition temperature (90-110°C). This parameter change eliminates hydrogen chloride generation during recycling while the optimized composition maintains vibration damping properties through controlled molecular structure and plasticizer interactions.
Solution Approach 2:
The patent creates an environmentally friendly composite plastisol system using acrylic polymer combined with phthalic acid dialkyl ester plasticizers and inert fillers like mica and wollastonite. This composite formulation replaces the harmful vinyl chloride resin while achieving comparable or superior vibration damping performance through the synergistic effects of the polymer-plasticizer-filler system.
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 resulting plastisol composition exhibits excellent storage stability, chipping resistance, and vibration damping properties, effectively converting vibration energy into heat energy.
Implementation Method 1
the vibration damping property of a coating film formed of a plastisol composition is insufficient... the coating film obtained from this plastisol composition has an effect of having excellent chipping resistance and an excellent vibration damping property... converting vibration energy into heat energy
Data Source
AI summary
The present invention provides a method for producing an acrylic polymer (P), said method including a step (1) of obtaining a polymer (A) by polymerizing an acrylic monomer mixture (a), and a step (2) of polymerizing an acrylic monomer mixture (b) in a dispersion liquid including the polymer (A) to form a polymer (B), and obtaining an acrylic polymer (P) including the polymer (A) and the polymer (B), wherein: the content ratio of t-butyl methacrylate is 8-32 mol% within 100 mol% of the total of the monomers included in the acrylic monomer mixture (a); the solubility parameter (SPA) of the polymer (A) is 19.90 (J/cm3)1/2 or more; the glass transition temperature of the polymer (A) is 90 °C or more; and the relationship between the solubility parameter (SPB) of the polymer (B) and the solubility parameter (SPA) satisfies belowmentioned formula (1). 0.05≤SPB−SPA≤0.55