Select the solvent used to clean acrylics and rubber.

Question

BlackTom AI · Accepted Answer

Aliphatic naphtha is a non-polar hydrocarbon solvent whose properties make it appropriate for cleaning acrylic and rubber surfaces without causing the rapid swelling or dissolution that stronger solvents produce.

1) Relevant knowledge points and concepts
- Solvent polarity and solvency: Non-polar solvents dissolve non-polar contaminants (oils, greases) and are gentler on many plastics than polar or strongly solvating chemicals.  
- Material compatibility: Acrylic (PMMA) and many rubbers are sensitive to ketones and aromatic solvents that can craze, soften, or dissolve them.  
- Practical use: Aliphatic naphtha (a mixture of saturated hydrocarbons) is formulated as a mild cleaning/thinning solvent with lower aromatic content and less aggressive action on plastics.

2) Step-by-step reasoning
- Identify the cleaning requirement: remove oils, residues, or adhesives from acrylic or rubber without damaging the substrate.  
- Evaluate solvent classes: strong ketones (acetone, MEK) are highly solvating and will attack acrylic; aromatic solvents (toluene, xylene) are strong and can soften plastics and some rubbers; alcohols (IPA) are safer for some plastics but are less effective on heavy oils.  
- Choose a solvent that balances cleaning power for non-polar contaminants with low attack on acrylic and rubber: aliphatic naphtha fits this balance.

3) Intermediate considerations (no numeric calculations required)
- Compare solvency strength qualitatively: acetone/MEK > toluene/xylene > aliphatic naphtha > isopropyl alcohol (for non-polar residues).  
- Given the need to protect acrylic, eliminate acetone/MEK and aromatics; aliphatic naphtha remains.

4) Why the correct answer is correct
Aliphatic naphtha’s non-polar hydrocarbon makeup dissolves oils and residues effectively while being less likely to chemically attack or craze PMMA acrylic and many rubbers, making it the preferred cleaner in these applications.

5) Why other common options are incorrect
- Acetone/MEK: too aggressive; will dissolve or craze acrylic.  
- Toluene/xylene (aromatics): stronger solvents that can soften plastics and certain rubbers.  
- Isopropyl alcohol/water: safer but often ineffective on heavy oil/grease.

6) Conclusion
For cleaning acrylics and rubber while minimizing damage, aliphatic naphtha is the appropriate solvent. This confirms the provided answer: Aliphatic naphtha.

Select the solvent used to clean acrylics and rubber. 单项选择题

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