A, mixing foaming resin, foaming auxiliary agent and adhesive resin (making finished adhesive);

B, carrying out foaming treatment. 80 parts of ethylene vinyl acetate (EVA), 20 parts of APAO PT 3385, 20 parts of azodicarbonamide, 19 part of CaCO and 0.6 part of dicumyl peroxide were mixed together, foamed in a mold, and the closed holes were broken by mechanical force, thereby preparing a foam sponge. Its density (d) is 0.028 g/cm, and its 25% compressive hardness is 65438 0.9 kPa.

Main components of sponge: Sponges commonly used by people are made of lignocellulosic fibers or foamed plastic polymers. In addition, there are natural sponges made of sponges, which are mostly used for body cleaning or painting. In addition, there are three kinds of synthetic sponges made of other materials, namely low-density polyether (non-absorbent sponge), polyvinyl alcohol (super absorbent material without obvious pores) and polyester.

Extended data:

Type of sponge material:

1, chemical sponge

Polyurethane soft foam rubber, polyurethane is the most common polymer material in life, which is widely used to make various "sponge" products. And elastic materials for shock absorption and friction resistance, such as soles and tractor tank track bases.

2. Industrial sponge

There are many kinds of sponges used in industrial production, including foamed cotton, shaped cotton, rubber cotton and memory cotton.

First, set cotton

This material is made of polyurethane, mixed with various additives such as foaming agent, heated and pressed in a simple mold to press sponges with different shapes. Suitable for swivel chair sofa cushions and back cotton, and a few handrails are also special-shaped cotton. The material density is 55#~60#, and its elasticity conforms to the relevant national standards. The elasticity and hardness of sponge can be adjusted according to different parts of the product. Generally, the hardness and density of seat cotton are higher, followed by back cotton, and pillow cotton is softer.

B, hair gel

This material is foamed with polyether, just like foamed bread. Foam can be foamed by mechanical equipment, or it can be enclosed by artificial boards. Slice it like a square bread with a slicer.

According to different requirements, the thickness can be cut, and the softness and hardness of foam can also be adjusted. Generally, 25~28kg/ m3 is used for cotton setting, and 20~22kg/ m3 is used for others. Although the softness and hardness of sponge are directly related to the density, they are also related to the different formulations of additives, so the industry is divided into high elasticity, gray super, black gray super and soft cotton.

When designing and using products, we should make reasonable and scientific collocation according to different shapes and structures. Sponges with different elasticity and density are generally distributed in the upper, middle and lower parts. There is a material (flame retardant cotton) in the sponge. In fact, before the sponge foams, a flame retardant, such as chlorine and bromine, is added to the material formula, which makes the sponge produce smoke when it catches fire and plays a role in flame retardant.

C, rubber cotton

A sponge is formed by foaming natural latex as the main material. It has rubber characteristics, excellent elasticity, good resilience and no deformation, but it is expensive, 3~4 times higher than foamed cotton.

D, regenerating sponge

Regenerated sponge is a new product and a general sponge treatment method. Regenerated sponge belongs to the reuse of industrial leftovers of polyurethane products. Its use value is no less than that of sponge. It is made of industrial sponge scraps by crushing, stirring, steaming, high-temperature disinfection, deodorization and molding.

The production cost is greatly reduced from the use of production cost. Good elasticity, good patience, no deformation, no odor. Can be made into products of various densities according to customer needs. The density of high-density and high-elasticity recycled sponge is above 60 kg/m3, which has the characteristics of high efficiency, flame retardancy, good tension, high elasticity and no deformation. After autoclaving, it is environmentally friendly, economical and practical.

It can be widely used to make sofas, mattresses, boss chairs, sports equipment, such as sponge gymnastics mats, sponge fitness mats, sponge wrestling mats, sponge car cushions and other products, and has been widely accepted by countries all over the world.

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