Application of PVA powder in waterproof and mortar

PVA powder

1、 Raw material indexes of PVA products: viscosity, alcoholysis degree, product phase (color, transparency)

Why use 88 instead of 99 for putty? The difference between 88 and 99 is that the PVA film of 88 is superior to 99 in strength and flexibility, water solubility, viscosity, adhesion and surface activity.

2、 Product fineness specification

The fineness of powdered products is usually expressed by mesh. Refers to the number of holes on the screen surface of one inch. Therefore, the mesh number and particle size are not one-to-one corresponding, but also related to the diameter of the metal wire used for the net. Refer to national standards GB / T 5330-2003 (Industrial sieves) and GB / t6003 1-2012 (test sieve).

4、 Characteristics and important applications of PVA powder

characteristic:

It mainly promotes the finest powder on the market, and the passing rate of 120 mesh sieve is 100%. PVA powder products with various particle sizes can be provided for different applications, such as 20 mesh, 60 mesh and 80 mesh products used in oil drilling and ordinary dry mixed mortar. At present, the production feasibility and cost of 160 mesh products are being evaluated. According to our nearly 30 years of industry experience and accurate judgment of the market situation, we can ensure the low-cost purchase of raw materials and the low satisfactory price of products.

PVA powder

Difference from rubber powder:

High adhesive force; Strong rigidity and high Tg value; Good initial viscosity; The viscosity of pva2488%4 aqueous solution is about 50, and the fluidity is lost when it exceeds 20%, so its rotational viscosity is much higher than that of VAE rubber powder. Thanks to the above properties, making non-standard products in the application of putty and tile glue can reduce the dosage and cost.

Applied to putty (including alkaline putty, neutral putty, gypsum based building materials, putty paste, etc.), ceramic tile adhesive, interface agent, polypropylene coil bonding and other fields.

5、 How to distinguish the quality of PVA powder products

Fineness Test: the use complies with the national standard GB / t6003 1-2012 or GB / t5330-2003 sieve with corresponding pore size, and calculate the proportion of sieve residue. The lower the better. Viscosity test: Brookfield Viscometer or NDJ-1 rotary viscometer. Ash content detection: the muffle furnace burns to constant weight at 900 ℃. Application test: observe the smoothness of putty scraping, and coarse particles are easy to leave scratches.

6、 Market chaos in PVA industry

Low viscosity acts as a high viscosity, complete alcoholysis type instead of partial alcoholysis type. Shoddy. All kinds of byproducts, defective products, leftover materials, floor sweeping products, yellow materials, etc. Add other low-cost products. Careful false publicity. The market disorder of PVA industry can be analyzed through instrument analysis, transparency detection, chemical analysis, screening and viscosity analysis.