SIST EN ISO 9771:1999 PDF

Name: SIST EN ISO 9771:1999 — Plastics - Phenolic resins - Determination of the pseudo-adiabatic temperature rise of liquid resols when cured under acid conditions (ISO 9771:1995)
SKU: SIST EN ISO 9771:1999
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Plastics - Phenolic resins - Determination of the pseudo-adiabatic temperature rise of liquid resols when cured under acid conditions (ISO 9771:1995)

Название (английский):

SIST EN ISO 9771:1999

Plastics - Phenolic resins - Determination of the pseudo-adiabatic temperature rise of liquid resols when cured under acid conditions (ISO 9771:1995)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 мая 1999 г.
ICS:: 83.080.10
Технический комитет:: IPMA - Polimer materials and products

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Описание (английский):

Cancels and replaces the first edition (1989). Specifies a method for determining the exothermic reactivity of thermosetting liquid phenolic resins when mixed with an acid hardener under specified conditions. The results of the determination are used as a means of assessing the behaviour of the resin during processing.

Abstract

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Overview

SIST EN ISO 9771:1999 is an international standard published by CEN that specifies a method for determining the pseudo-adiabatic temperature rise of liquid phenolic resol resins when cured under acid conditions. This standard is essential for assessing the exothermic reactivity of thermosetting phenolic resins mixed with acid hardeners, providing valuable data on the resin’s behavior during processing. The method outlined in this standard replaces the first edition from 1989 and ensures consistent and reliable measurements that are critical for quality control and formulation optimization in the plastics industry.

Key Topics

Scope and Purpose SIST EN ISO 9771:1999 outlines a laboratory test to measure the highest temperature reached and the time taken during the curing reaction of phenolic resol resins under acidic conditions. This data helps predict processing performance and manage curing parameters in industrial applications.

Test Principle The test involves mixing a phenolic resin with a specified acid hardener. The reaction is conducted in a thermally insulated environment to approximate pseudo-adiabatic conditions. A thermocouple records the temperature rise caused by the exothermic curing reaction.

Apparatus and Materials Key test equipment includes:

A polyethylene-impregnated paper cup reaction vessel
A hollow foam block for thermal insulation
A suitable acid hardener-e.g., phenol sulfonic acid at technical grade
Thermocouples and temperature recording devices
Stirring devices and precise measuring equipment

Test Procedure The phenolic resin sample is weighed and conditioned at 23 °C ± 0.2 °C before mixing with the acid hardener. Temperature recording starts immediately upon mixing, with continuous stirring for 35 seconds to ensure homogeneity. The time and peak temperature of the curing exotherm are recorded.

Expression of Results

Maximum temperature rise (°C)
Time until maximum temperature is reached (minutes) Results must be averaged over at least two tests, with precision targets of ±3% repeatability for temperature and ±5% for timing.

Test Reporting Reports must include:

Reference to SIST EN ISO 9771:1999
Resin and hardener identification
Test conditions including starting and maximum temperatures, time to peak temperature, and mixing time used

Applications

SIST EN ISO 9771:1999 is crucial for industries involved in the production and processing of thermosetting phenolic resins, widely used in:

Automotive parts

Electrical insulation components

Laminates and composites

Adhesives and coatings

By understanding the thermal behavior of phenolic resins during acid curing, manufacturers can optimize processing parameters, improve product consistency, and prevent defects caused by uncontrolled exothermic reactions.

Related Standards

Professionals using SIST EN ISO 9771:1999 often work alongside or reference related international standards, including:

ISO 4625 and ISO 4626 – Methods for viscosity and resin content in phenolic resins

ISO 11357 – Plastics-Differential scanning calorimetry (DSC) methods for curing analysis

EN ISO 9001 – Quality management systems important for ensuring consistent resin production and testing

Summary

SIST EN ISO 9771:1999 provides a standardized procedure for evaluating the exothermic curing characteristics of phenolic resol resins in acid conditions. This method supports better control over resin formulation and processing, enabling manufacturers to enhance product reliability and efficiency. The standard’s precise test setup and repeatable results make it a critical tool in the plastics and thermosetting materials industries, particularly where phenolic resin performance is key.

SIST EN ISO 9771:1999 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

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Summary

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