阅读说明：本技术 一种珍珠棉及其生产工艺 (Pearl cotton and production process thereof ) 是由 吴彬枫 许万 孙亚平 于 2019-08-14 设计创作，主要内容包括：本发明涉及一种珍珠棉,其制备原料按重量份包括：聚乙烯100-155份、改性VAE乳液10-15份、钛酸酯改性碳酸钙10-19份、氢氧化铝3-7份、单甘脂2-3份、发泡剂6-10份、滑石粉1-3份、阻燃剂1-3份、水玻璃5-10份、硅烷偶联剂1-3份；在珍珠棉中添加改性VAE乳液,能够提高珍珠棉连接的稳定性,在反应过程中会使得乳胶粒表面电荷增加,乳胶粒间相互排斥作用增强,相互聚结减少,使体系稳定。(The invention relates to pearl wool, which comprises the following raw materials in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 3-7 parts of aluminum hydroxide, 2-3 parts of monoglyceride, 6-10 parts of foaming agent, 1-3 parts of talcum powder, 1-3 parts of flame retardant, 5-10 parts of water glass and 1-3 parts of silane coupling agent; the modified VAE emulsion is added into the pearl cotton, so that the connection stability of the pearl cotton can be improved, the surface charge of latex particles is increased in the reaction process, the mutual repulsion between the latex particles is enhanced, the mutual coalescence is reduced, and the system is stable.)

1. The pearl wool is characterized in that: the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 3-7 parts of aluminum hydroxide, 2-3 parts of monoglyceride, 6-10 parts of foaming agent, 1-3 parts of talcum powder, 1-3 parts of flame retardant, 5-10 parts of water glass and 1-3 parts of silane coupling agent.

2. The pearl wool according to claim 1, wherein: the preparation raw materials comprise the following components in parts by weight: 100 parts of polyethylene, 10 parts of modified VAE emulsion, 10 parts of titanate modified calcium carbonate, 3 parts of aluminum hydroxide, 2 parts of monoglyceride, 6 parts of foaming agent, 1 part of talcum powder, 1 part of flame retardant, 5 parts of water glass and 1 part of silane coupling agent.

3. The pearl wool according to claim 1, wherein: the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 15 parts of modified VAE emulsion, 19 parts of titanate modified calcium carbonate, 7 parts of aluminum hydroxide, 3 parts of monoglyceride, 10 parts of foaming agent, 3 parts of talcum powder, 3 parts of flame retardant, 10 parts of water glass and 3 parts of silane coupling agent.

4. The pearl wool according to claim 1, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 45-59 parts of VAE, 5-7 parts of polyvinyl alcohol, 15-20 parts of vinyl acetate, 1-4 parts of ammonium persulfate and 1-3 parts of potassium persulfate.

5. The pearl wool according to claim 1, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 45 parts of VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate.

6. The pearl wool according to claim 1, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 59 parts of VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate.

7. The pearl wool according to claim 1, 2 or 3, wherein: the foaming agent is any one of azodicarbonamide, dinitrosopentamethylenetetramine or 4,4' -oxybis-benzenesulfonylhydrazide.

8. A process for producing pearl wool according to any of claims 1 to 7, characterized in that: the method comprises the following steps:

step one, mixing materials, drying talcum powder and titanate modified calcium carbonate, sieving the dried talcum powder and titanate modified calcium carbonate with a sieve of 100-150 meshes, adding the dried talcum powder and monoglyceride into a high-speed mixer, stirring and mixing the mixture for 20-30min at the temperature of 110-120 ℃ at the speed of 500-1000rpm, adding water glass, continuously stirring the mixture for 10-15min, then adding a silane coupling agent, blending the mixture for 5-10min at the speed of 1500-2000rpm, feeding the mixture into a granulator for granulation, controlling the particle size to be 0.2-0.3mm, and drying the mixture to obtain a mixture A for later use;

pouring the weighed VAE, polyvinyl alcohol, vinyl acetate, ammonium persulfate and potassium persulfate into a reaction kettle together for mixing and heating, uniformly stirring, and preserving heat to prepare a modified VAE emulsion for later use;

step three, pouring the modified VAE emulsion obtained in the step two into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, then respectively adding the weighed foaming agent and the weighed flame retardant into the stirrer to be mixed with the modified VAE emulsion, heating and stirring, and enabling the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;

pouring the weighed polyethylene and aluminum hydroxide into a stirrer to be mixed and dried with the mixture A and the mixture B, and drying for 15-30 minutes to obtain a dry mixture C for later use;

step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping a foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (calculated according to 1kg of the raw material), the anti-shrinking agent is pumped by an anti-shrinking agent pump at 8-12g/min (calculated according to 1kg of the raw material), the raw material is pushed by a screw, the rotating speed of the screw is 100-170r/min, the temperature of the raw material is reduced to 130-phase temperature in a molding heating section, the raw material is extruded from a mold opening, and the temperature of the mold opening is 145-175 ℃; manufacturing a pearl cotton sheet;

step six, traction sizing; drawing the pearl cotton sheet manufactured in the step (V) out by a tractor, wherein the drawing speed is 5-8 m/min; shaping the sheet material by a shaping drum;

step seven, cooling; cooling and shaping the sheet in the step (VI) through a wind ring, wherein the cooling temperature is 30-40 ℃;

step (eight), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;

step nine, rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.

Technical Field

The invention belongs to the technical field of pearl cotton, and particularly relates to pearl cotton and a production process thereof.

Background

EPE pearl cotton is a non-crosslinked closed-cell structure, is a high-foam polyethylene product which is extruded by using low-density polyethylene (LDPE) as a main raw material, is also called polyethylene foam cotton, and is a novel environment-friendly packaging material. Because the low-density polyethylene resin is formed by innumerable independent bubbles generated by physical foaming of the low-density polyethylene resin, the defects of fragility, deformation and poor recovery of common foaming glue are overcome, and the low-density polyethylene resin has the advantages of water resistance, moisture resistance, shock resistance, sound insulation, heat preservation, good plastic property, strong toughness, cyclic reconstruction, environmental protection, strong impact resistance and the like, and also has good chemical resistance.

Because the pearl cotton is a high-foaming forming product, the weight is light, the flexibility and the cushioning property are good, the heat conductivity is low, the heat insulation property is excellent, and the foam material with independent bubbles is a waterproof material with almost no water absorption; however, the traditional foamed pearl wool still has the problems of poor moisture resistance and water resistance, and the application range is limited, so the traditional foamed pearl wool still needs to be researched, and the application range is greatly limited.

In view of the above technical problems, improvements are needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides pearl cotton and a production process thereof aiming at the problem that the traditional pearl cotton is poor in moisture-proof and waterproof performances.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the pearl cotton comprises the following preparation raw materials in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 3-7 parts of aluminum hydroxide, 2-3 parts of monoglyceride, 6-10 parts of foaming agent, 1-3 parts of talcum powder, 1-3 parts of flame retardant, 5-10 parts of water glass and 1-3 parts of silane coupling agent.

As a preferred mode of the invention, the pearl cotton comprises the following preparation raw materials in parts by weight: 100 parts of polyethylene, 10 parts of modified VAE emulsion, 10 parts of titanate modified calcium carbonate, 3 parts of aluminum hydroxide, 2 parts of monoglyceride, 6 parts of foaming agent, 1 part of talcum powder, 1 part of flame retardant, 5 parts of water glass and 1 part of silane coupling agent.

As a preferred mode of the invention, the pearl cotton comprises the following preparation raw materials in parts by weight: 155 parts of polyethylene, 15 parts of modified VAE emulsion, 19 parts of titanate modified calcium carbonate, 7 parts of aluminum hydroxide, 3 parts of monoglyceride, 10 parts of foaming agent, 3 parts of talcum powder, 3 parts of flame retardant, 10 parts of water glass and 3 parts of silane coupling agent.

In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 45-59 parts of VAE, 5-7 parts of polyvinyl alcohol, 15-20 parts of vinyl acetate, 1-4 parts of ammonium persulfate and 1-3 parts of potassium persulfate.

In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 45 parts of VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate.

In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 59 parts of VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate.

In a preferred embodiment of the present invention, the foaming agent is any one of azodicarbonamide, dinitrosopentamethylenetetramine, and 4,4' -oxybis-benzenesulfonylhydrazide.

A production process of pearl wool is characterized in that: the method comprises the following steps:

step one, mixing materials, drying talcum powder and titanate modified calcium carbonate, sieving the dried talcum powder and titanate modified calcium carbonate with a sieve of 100-150 meshes, adding the dried talcum powder and monoglyceride into a high-speed mixer, stirring and mixing the mixture for 20-30min at the temperature of 110-120 ℃ at the speed of 500-1000rpm, adding water glass, continuously stirring the mixture for 10-15min, then adding a silane coupling agent, blending the mixture for 5-10min at the speed of 1500-2000rpm, feeding the mixture into a granulator for granulation, controlling the particle size to be 0.2-0.3mm, and drying the mixture to obtain a mixture A for later use;

pouring the weighed VAE, polyvinyl alcohol, vinyl acetate, ammonium persulfate and potassium persulfate into a reaction kettle together for mixing and heating, uniformly stirring, and preserving heat to prepare a modified VAE emulsion for later use;

step three, pouring the modified VAE emulsion obtained in the step two into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, then respectively adding the weighed foaming agent and the weighed flame retardant into the stirrer to be mixed with the modified VAE emulsion, heating and stirring, and enabling the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;

pouring the weighed polyethylene and aluminum hydroxide into a stirrer to be mixed and dried with the mixture A and the mixture B, and drying for 15-30 minutes to obtain a dry mixture C for later use;

step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping a foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (calculated according to 1kg of the raw material), the anti-shrinking agent is pumped by an anti-shrinking agent pump at 8-12g/min (calculated according to 1kg of the raw material), the raw material is pushed by a screw, the rotating speed of the screw is 100-170r/min, the temperature of the raw material is reduced to 130-phase temperature in a molding heating section, the raw material is extruded from a mold opening, and the temperature of the mold opening is 145-175 ℃; manufacturing a pearl cotton sheet;

step six, traction sizing; drawing the pearl cotton sheet manufactured in the step (V) out by a tractor, wherein the drawing speed is 5-8 m/min; shaping the sheet material by a shaping drum;

step seven, cooling; cooling and shaping the sheet in the step (VI) through a wind ring, wherein the cooling temperature is 30-40 ℃;

step (eight), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;

step nine, rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.

The invention has the beneficial effects that:

1. the modified VAE emulsion is added into the pearl cotton, so that the connection stability of the pearl cotton can be improved, the surface charge of latex particles is increased in the reaction process, the mutual repulsion between the latex particles is enhanced, the mutual coalescence is reduced, and the system is stable.

2. The main raw materials adopted by the invention are polyethylene and titanate modified calcium carbonate which have excellent dispersibility and surface activity, and the titanate modified calcium carbonate is easier to be mixed with polyethylene under the action of the mixed solution A and the silane coupling agent, so that the polyethylene modified calcium carbonate has excellent antistatic capability and stable antistatic value. The interaction between polyethylene and titanate modified calcium carbonate is enhanced, and the mechanical properties of the pearl wool, such as impact strength, tensile strength, bending strength, elongation and the like, can be obviously improved.

Detailed Description

The following provides a detailed description of embodiments of the invention.