Differences among formaldehyde resin, phenolic glue and urea formaldehyde glue

Phenolic glue is mainly made of phenol and formaldehyde; Melamine glue (melamine formaldehyde resin) takes melamine and formaldehyde as the main raw materials; Urea formaldehyde adhesive is mainly made of urea and formaldehyde, with different characteristics: phenolic adhesive has strong water resistance; Melamine glue has good hardness and high transparency; Urea formaldehyde glue has low cost and wide application.

The national standard notes on coatings and paints. Coatings are defined as follows: in the early stage, most of them used vegetable oil as the main raw material, so they are called paint. Now synthetic resin has largely or completely replaced vegetable oil, so it is called coating.

There are two views on the above definition:

1. The reason why this kind of material is called paint rather than paint is more due to the development of paint varieties and categories, because the name of paint can not cover all kinds of existing products in the industry, and the word paint can cover all kinds of products in the industry, so the name of paint is more accurate and scientific. For example, powder coating products should not use the title of paint. Paint and paint are not interchangeable here. Therefore, the paint can cover solid powder paint and liquid paint, but the replacement is not, so the explanation in the standard is not very in place.

2. The "note" in the coating terminology in the standard: that is, "the word 'paint' can be used in the specific coating variety name, such as ready mixed paint, thick paint, etc." is also somewhat inappropriate. Because in fact, the word "paint" is not only used in specific paint varieties, but also widely used in paint categories, such as acrylic paint, polyurethane paint, etc., but also widely used in general terms in application fields, such as anti-corrosion paint, automotive paint, marine paint, etc. In fact, except for individual cases, the words "paint" and "paint" are common, and they do not specifically refer to specific varieties.

This product should be stored in a ventilated and dry warehouse. Prevent direct sunlight, isolate fire source and keep away from heat source.

The storage period of the product is 1 year from the date of production. Beyond the storage period, it can be inspected again according to the provisions of this standard. If it meets the quality requirements, it can still be used.