The invention discloses a polyvinyl formal
sponge fabric, a preparation method therefor and an application of the polyvinyl formal
sponge fabric. The
sponge fabric is polyvinyl formal sponge and is prepared from the following
raw material ingredients in parts by
mass: 80-150 parts of
polyvinyl alcohol, 300-1,800 parts of water, 10-150 parts of
formaldehyde or hexamethylene
tetramine, 10-300 partsof
hydrochloric acid or
sulfuric acid and 0.01-3 parts of surfactant. According to the sponge, both
porosity and pore rate are not lower than 85%, the average pore size is between 10 microns and 2mm,the degree of acetalization is 30% to 70%, and the sponge has the thickness of 0.5mm to 10cm and has the
dry density of 0.05 to 0.12. According to the polyvinyl formal sponge fabric, the preparation method therefor and the application of the polyvinyl formal sponge fabric, the process is short in cycle, low in emission, low in
energy consumption and high in product uniformity and can be used for carrying out
continuous production; the obtained sponge fabric is integrated sponge with a three-dimensional open-pore structure, is air-permeable, fluffy, soft and comfortable, is free of
fiber falling and has excellent liquid sucking characteristics; and the materials can be applied to filtering industry instead of the traditional
filter media such as non-woven fabrics,
Kraft paper and glass fibers.