CN111286090A

CN111286090A - Preparation method of sulfur dispersion for latex sponge

Info

Publication number: CN111286090A
Application number: CN201811503937.5A
Authority: CN
Inventors: 何拥军; 贾成浩; 田勇; 刁国旺
Original assignee: Jiangsu Jsy Latex Product Co ltd; Yangzhou University
Current assignee: Jiangsu Jsy Latex Product Co ltd; Yangzhou University
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2020-06-16

Abstract

A preparation method of sulfur dispersion for latex sponge. Relates to the field of latex industry, in particular to a preparation method of a sulfur dispersion for latex sponge. Provides a preparation method of the sulfur dispersion for the latex sponge, which can improve the performance of the latex sponge and has good dispersion effect. The dispersant is dinaphthyl methane sodium disulfonate or sodium lignosulfonate. The humectant is one or more of a humectant OT, a humectant JFC or a nekal BX. The particle size of the sulfur dispersion is D502.2-4.0 μm and D903.5-8.5 μm. The sulfur, the dispersant, the wetting agent and the water are mixed according to a certain proportion and ground to prepare the sulfur dispersoid.

Description

Preparation method of sulfur dispersion for latex sponge

Technical Field

The invention relates to the field of latex industry, in particular to a preparation method of a sulfur dispersion for latex sponges.

Background

Latex sponge is a low density, porous, open-cell material, also known as a continuous foam of rubber. Latex sponges have many characteristics, such as excellent buffering and decompression performance, compression fatigue resistance, good heat preservation, sound insulation and heat resistance, and are widely applied to the automobile industry, the aviation industry, the chemical industry, medical appliances, sound insulation, shock resistance, heat insulation, sealing, life hygiene, sports goods and other aspects, and have long been the main products in the latex industry, and account for more than half of the total annual latex consumption.

Latex sponges have a variety of vulcanization systems: a sulfur vulcanization system, a thiuram vulcanization system, an organic peroxide vulcanization system, and a radiation vulcanization system. The sulfur vulcanization system is a method mostly adopted in the current latex sponge industrial production, sulfur, vulcanization accelerator and the like enter colloidal particles in a molecular or particle form to be contacted with rubber, and then a vulcanization reaction is quickly carried out on the outer layer of the colloidal particles under the action of temperature, namely, a cross-linking reaction mainly occurs on the surface layer of the particles. The dispersion effect of the sulfur dispersion has great influence on the diffusion of sulfur particles in the emulsion, thereby influencing the vulcanization reaction of colloidal particles and finally influencing the performance of products. Moreover, the sulfur is a strong hydrophobic substance and is not easy to disperse in water, so that the selection of a proper dispersing agent and a proper wetting agent is particularly important. Sodium lignosulfonate is an anionic dispersant and has a large molecular weight. Not only can provide electrostatic repulsion, but also has steric hindrance effect, and can increase sulfur dispersibility and suspension ability. However, sodium lignosulfonate is inferior in reducing surface tension, wettability and permeability, so it is necessary to select a suitable wetting agent to be used in combination therewith.

Disclosure of Invention

Aiming at the problems, the invention provides the preparation method of the sulfur dispersion for the latex sponge, which can improve the performance of the latex sponge and has good dispersion effect.

The technical scheme of the invention is as follows: the method comprises the following steps: according to the mass parts, 45-55 parts of sulfur powder, 1-3 parts of dispersing agent, 0.5-1.5 parts of wetting agent and 46.5-48.5 parts of water are stirred and mixed, and then sanding is carried out for 4-8 hours, thus obtaining the sulfur-containing water-based paint.

The dispersant is dinaphthyl methane sodium disulfonate or sodium lignosulfonate.

The humectant is one or more of a humectant OT, a humectant JFC or a nekal BX.

The particle size of the sulfur dispersion is D502.2-4.0 μm and D903.5-8.5 μm.

The invention has the beneficial effects that: the sulfur, the dispersant, the wetting agent and the water are mixed according to a certain proportion and ground to prepare the sulfur dispersoid. The dispersing agent can improve the good dispersing ability, and the wetting agent can ensure that the dispersing agent can be better contacted with the sulfur, improve the dispersing effect of the dispersing agent and ensure that the sulfur is kept in a uniformly dispersed state in water. Therefore, the method can improve the dispersion effect of the sulfur dispersion, thereby improving the vulcanization effect and quality and further improving the quality of the latex sponge. The wetting agent OT can remarkably reduce surface tension and quickly permeate the surface of sulfur, and can well disperse sulfur and slow down the sedimentation of the sulfur when being matched with sodium lignosulphonate.

Detailed Description

The present invention will be described in detail with reference to examples.

Example 1

45 parts of sulfur and 1 part of sodium dinaphthylmethanedisulfonate, 0.5 part of a wetting agent OT and 46.5 parts of water are mixed and then ground for 4 hours using a sand mill, and the particle size is measured: d502.5 μm, D905.8 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 65 kPa, compression set: 8.5 percent.

Example 2

50 parts of sulphur and 2 parts of sodium dinaphthylmethanesulfonate, 1 part of a wetting agent JFC and 48 parts of water are mixed and then ground for 6h using a sand mill, and the particle size is measured: d503.4 μm, D907.6 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 47 kPa, compression set: 9.7 percent.

Example 3

55 parts of sulphur and 3 parts of sodium lignosulfonate, 1.5 parts of nekal BX and 48.5 parts of water are mixed and then ground for 8 hours using a sand mill, and the particle size is measured: d503.9 μm, D908.5 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 45 kPa, compression set: 10.6 percent.

Example 4

50 parts of sulfur and 1 part of sodium lignosulfonate, 1 part of wetting agent OT, 0.5 part of sodium lignosulfonate and 48 parts of water are mixed and then ground for 6 hours using a sand mill, and the particle size is measured: d502.5 μm, D903.5 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 75kPa, compression set: 6.8 percent.

Example 5

50 parts of sulphur and 1 part of sodium lignosulfonate, 1 part of wetting agent JFC and 48 parts of water are mixed and then ground for 5 hours using a sand mill, and the particle size is measured: d502.2 μm, D904.5 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 66 kPa, compression set: 8.1 percent.

Example 6

50 parts of sulphur and 1 part of sodium lignosulfonate, 1 part of nekal BX and 48 parts of water are mixed and then ground for 8 hours using a sand mill, and the particle size is tested: d502.9 μm, D905.6 μm.

Adding 8 parts of ground sulfur dispersoid and small materials such as potassium oleate into 100 parts of natural latex, performing procedures such as ripening, foaming, vulcanizing, drying and the like to obtain natural latex sponge, and finally performing performance test: tensile strength: 59 kPa, compression set: 8.9 percent.

Claims

1. The preparation method of the sulfur dispersion for the latex sponge is characterized by comprising the following steps of: according to the mass parts, 45-55 parts of sulfur powder, 1-3 parts of dispersing agent, 0.5-1.5 parts of wetting agent and 46.5-48.5 parts of water are stirred and mixed, and then sanding is carried out for 4-8 hours, thus obtaining the sulfur-containing water-based paint.

2. The method for preparing the sulfur dispersion for the latex sponge according to claim 1, wherein the dispersant is dinaphthylmethane sodium disulfonate or sodium lignosulfonate.

3. The method for preparing the sulfur dispersion for the latex sponge according to claim 1, wherein the wetting agent is one or more of a wetting agent OT, a wetting agent JFC and a nekal BX.

4. The method for preparing the sulfur dispersion for the latex sponge according to claim 1, wherein the particle size of the sulfur dispersion is D502.2-4.0 μm and D903.5-8.5 μm.