Which performance subjects should be tested for phenolic resin used in phenolic molding compounds? How to judge the results?

Phenolic resins for phenolic molding compounds are synthesized from phenols and aldehydes as main raw materials. According to the state of the product, it is divided into two types: solid and liquid, which are represented by S and L respectively. Divided into six categories according to product properties: pure resin (code 1), cardanol modified resin (code 2), melamine modified resin (code 3), polyvinyl butyral (PVB) modified resin (code 4) , Aniline modified resin (code 5), other modified resins (code 6).

Today I will introduce what conditions should be met in the performance testing of phenolic resins for phenolic molding compounds under the provisions of GB/T30772-2014. The product needs to be named before testing to prevent confusion. See below.

Item detection

Performance requirements of solid phenolic resin for phenolic molding

1. Appearance: Codes 1, 3, and 4 should be in the form of colorless to yellow solids without obvious impurities; code 2 should be in the form of brown solids without obvious impurities; code 5 should be in the form of light yellow to brown solids without obvious impurities Visible impurities;

2. The polymerization time is 20s~11s.

3. Free phenol content ≤ 5.0%.

4. The swimming degree is 13mm~80mm.

5. The softening point is 85℃~125℃.

6. The solution viscosity is 45MPa*s~300MPa*s.

7. The pH value is 3.0~6.5.

8. Moisture content ≤1.0%.

Performance requirements of liquid phenolic resins for phenolic molding compounds

 Code 6: The appearance should be brown-red/brown-yellow translucent liquid, without obvious visible impurities; moisture ≤ 10.0%; solid content ≥ 40.0%; free phenol content ≤ 15.0%; free formaldehyde content ≤ 2.0%; pH value 7.0 ~9.0.