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Polyurethane – PU

Name: پلی اورتان (PU) مزایا، ویژگیها، کاربردها و محصولات
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Polyurethane – PU

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Polyurethane – PU

category : polymer
tag : polymer
Production date : 24 اسفند 1403
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type : پلی اورتان – PU
comments count : 0
price : 12,589 Toman
off : 5%

Product Description

Polyurethane (PU)

Introduction to Polyurethane

Polyurethane (PU) is a versatile class of polymers formed through the reaction between polyols and isocyanates. Due to its broad adaptability, polyurethane is widely used in various forms such as soft and rigid foams, elastomers, coatings, adhesives, sealants, and resins across multiple industries.

Shamsh Azadi Company is a leading manufacturer and supplier of polyurethane products in sheet, rod, tube, and foam formats, offering precise cutting, machining, and turning services at competitive prices and high quality.

Key Properties and Technical Characteristics

Property	Description
Hardness	High resistance to indentation under pressure
Flexibility	Excellent elastic recovery after deformation
Load-bearing capacity	Suitable for dynamic and static loads
Insulation	Thermal, sound, and electrical insulation
Adhesion	Strong bonding to metals, plastics, wood
Chemical resistance	Withstands oils, acids, and solvents
Non-toxic	Approved for potable water contact
Anti-fungal	Resistant to mold, mildew, and moisture

Advantages and Disadvantages of Polyurethane

Advantages	Disadvantages
High mechanical strength	Sensitive to moisture during storage
Excellent adhesion	Some grades are flammable
Great thermal & sound insulation	Poor UV resistance (in some types)
High elasticity and rebound	Affected by certain solvents
Strong chemical resistance	Use of toxic isocyanates in production

Applications of Polyurethane

Industry	Application
Construction	Thermal insulation, sealants, flooring
Automotive	Seats, dashboards, interior parts
Packaging	Impact protection, food-safe foams
Furniture	Cushions, mattresses, backrests
Electronics	Encapsulation, insulation coatings
Marine	Waterproof coatings and protection
Medical	Molds, protective orthopedic supports
Food Industry	Safe packaging for sausages and more

Types of Polyurethane Products

Product Type	Application
PU Sheets	Industrial gaskets, cut-to-shape parts
PU Rods	Machined parts and bushings
PU Tubes	High-pressure fluid transfer
PU Foam	Insulation, cushioning, impact protection
PU Adhesives	Construction, furniture, automotive bonding

Degradation of Polyurethane and Prevention

Polyurethane can undergo chemical degradation due to the breakdown of urethane and ester bonds in the presence of moisture, heat, or UV exposure. These degrade into alcohols, acids, and CO₂. Common methods to reduce degradation include cellulysis, thermolysis, pyrolysis, and photolysis.

Storage and Handling Guidelines

One of the main raw materials, polyol, is highly hygroscopic and absorbs moisture from the air. This leads to excess CO₂ generation and reduced foam density and performance. To maintain material quality, polyurethane raw materials must be stored in dry, airtight environments.

Polyurethane Insulation

PU foams are known for their excellent thermal and acoustic insulation properties. By altering the foam's density and cellular structure, it can be tailored for different applications, from construction insulation panels to soundproofing and refrigeration systems.

Product Technical Summary

Definition:
Polyurethane refers to a category of polymers featuring urethane linkages, formed by reacting isocyanates with polyols containing active hydrogen atoms (e.g., hydroxyl groups).

Temperature Range Use:
Rigid PU foam has been effectively used for thermal insulation in environments ranging from -196°C (liquid nitrogen) to +126°C (steam systems).

Frequently Asked Questions (FAQ)

1. Is polyurethane safe for food contact?
Yes. Specific PU grades are non-toxic and certified for potable water and food packaging use.

2. What's the difference between soft and rigid PU foam?
Soft foams are ideal for cushioning (like mattresses), while rigid foams serve for insulation and structural applications.

3. Is polyurethane UV-resistant?
Some grades are UV-resistant, suitable for outdoor use. Others may require coatings for protection.

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