Three minutes to understand all the knowledge of resin testing

As the polymer or prepolymer of plastic substrate, resin plays an important role in the fields of plastic products, coating products, handicraft manufacturing and so on. Therefore, resin is generally used as processing materials to participate in the production of these products. So in the process of incoming material testing, resin quality testing has become a necessary step. However, there are many kinds of resins, and the testing standards are not relatively perfect, so many times we will be confused about the testing items of resins. Today, we will draw inferences from one instance to introduce the knowledge of resin testing.

First of all, although there are many kinds of resins and miscellaneous testing standards, there are always some common testing items that can be used to evaluate the quality of resins. Such as apparent density, haze, yellowness, whiteness, swelling ratio, water content, acid value, melting point, hardness, impact strength, tensile properties and so on are very common test indicators. If you want to test the production parameters of the resin, we can test the melt index, viscosity, mold shrinkage, melting temperature of the resin.

In fact, there are many testing items for resin. Generally speaking, the testing items can be divided into four categories, including physical properties, combustion properties, thermal properties, applicability and other testing items. The specific detection indexes are as follows:
1.Physical properties test items: apparent density, light transmittance, haze, yellow index, whiteness, expansion ratio, water content, acidity and hardness
2. Test items of resin combustion performance: vertical combustion, ignition temperature, oxygen index, horizontal combustion, hot rod
3. Testing items of resin thermal properties: thermal deformation temperature, thermal decomposition temperature, Vicat softening point, high and low temperature impact, glass transition temperature, melting temperature
4. Resin applicability test items: conductivity, corrosion resistance, low temperature resistance, hydraulic resistance, insulation, moisture permeability, food and drug safety
Testing project is the focus of resin testing, but it is the premise to find out the suitable resin testing products. The following six categories are suitable for resin testing.
1. Testing products of plastic raw materials: PVC, polypropylene, polystyrene, polyethylene, polytetrafluoroethylene, polycarbonate, ABS resin, polyamide, polyurethane, epoxy resin, polyethylene terephthalate, polybutylene terephthalate, polyarylate, phenol formaldehyde molding compound, CO formaldehyde resin, Polyamide 1010 resin, polycarbonate, etc
2. Alkyd resin testing products: alkyd resin for industrial baking paint, alkyd resin for air drying paint, alkyd resin for polyurethane paint, alkyd resin for nitro paint, alkyd resin for polyester paint, alkyd resin for high performance polyester paint, alkyd resin for industrial amino baking paint
3. Epoxy resin and supporting testing products: common bisphenol A epoxy resin, flame retardant brominated epoxy resin, heat-resistant phenolic epoxy resin, epoxy active diluent, waterborne epoxy resin, alicyclic amine curing agent, epoxy ester resin, epoxy resin curing agent
4. Amino resin testing products: butyl etherified amino resin, methyl etherified amino resin, urea formaldehyde resin, mixed etherified amino resin, polyurethane curing agent, general curing agent, quick drying curing agent, trimer curing agent, moisture curing (prepolymer) curing agent, low free TDI Polyurethane series curing agent
5. Acrylic resin testing products: thermoplastic acrylic resin, thermosetting acrylic resin, acrylic resin for wood coatings, solvent based acrylic pressure sensitive adhesive, thermoplastic acrylic resin for wood and rattan coatings, acrylic tree for solvent based exterior wall coatings, hydroxyl acrylic resin
6. Saturated polyester resin testing products: alkyd resin for automobile paint and general industrial baking paint, light curing resin and its monomer, oligomer epoxy acrylate, polyurethane acrylate, oligomer amino acrylate, monomer (hexafunctional monomer), monomer (trifunctional monomer), monomer (bifunctional monomer), monomer (monofunctional monomer)
After understanding the resin testing products and resin testing items, naturally we need to talk about the resin testing standards. There are many and miscellaneous resin testing standards. Here we just extract some common resin testing standards for your reference:
GB / t13657-1992 bisphenol A epoxy resin
GB / T 12007.1-1989 determination of color of epoxy resins Gardner colorimetric method
GB / T 12007.2-1989 determination of sodium ion in epoxy resin
GB / T 12007.3-1989 method for determination of total chlorine content of epoxy resin
GB / T 12007.4-1989 method for determination of viscosity of epoxy resins
GB / T 12007.5-1989 determination of density of epoxy resin and Pycnometer method
GB / T 12007.6-1989 method for determination of softening point of epoxy resins
GB/T 12007.7 - 1989 epoxy resin gel time determination method
GB / T 2567-2008 general rules of test methods for mechanical properties of resin castings
GB / T 2568-1995 tensile test method for resin casting
GB / T 2569-1995 compression test method for resin casting
GB / T 2570-1995 bending test method for resin casting
GB / T 2571-1995 impact test method for resin casting
GB / T 4726-1984 torsion test method for resin casting
GB 7193.1-87 determination of viscosity of unsaturated polyester resin
GB 7193.3-87 method for determination of solid content of unsaturated polyester resin
Determination of gel time of GB 7193.6 - 87 unsaturated polyester resin at 25 OC
GB 2895-82 determination of acid value of unsaturated polyester resin
Q / 5s69-94 determination of epoxy equivalent of epoxy compounds hydrogen bromide glacial acetic acid nonaqueous titration method
DL / t1077-2007 determination method of organic dissolved matter in styrene ion exchange resin (dynamic method)
Test method for crosslinking degree of FZ / t01080-2009 resin finished fabrics dyeing method
GB / t11991-2008 determination method of transformation expansion rate of ion exchange resin
GB / t11992-2008 determination of exchange capacity of chlorine type strong basic anion exchange resin
The wide application of resin in modern industry determines that resin testing is bound to be the key consideration of resin products. Through the resin testing products, resin testing items, resin testing standards of the general understanding. We can have a basic understanding of resin testing. However, when it comes to the specific resin products, we still need to analyze the specific problems and find the test items to provide quality resin test reports.