CN-121991396-A - ADC foaming agent for improving foaming pore density and preparation method thereof

CN121991396ACN 121991396 ACN121991396 ACN 121991396ACN-121991396-A

Abstract

The application provides a preparation method of an ADC foaming agent for improving foaming pore density, which comprises the following steps of mixing a modified inorganic nucleating agent with water according to a preset mass ratio, adding a dispersing agent, uniformly mixing to prepare uniform and stable suspension slurry for preventing the nucleating agent from agglomerating, adding the suspension slurry when the biurea conversion rate reaches 80% -85%, enabling the inorganic nucleating agent to be uniformly attached to the surface of ADC crystals, and continuously carrying out oxidation reaction until the biurea conversion rate reaches more than 92%, and then washing, centrifuging and drying to obtain the ADC foaming agent. The ADC foaming agent for improving the foaming pore density is prepared by the method. According to the application, the inorganic nucleating agent is added in the preparation stage of the ADC foaming agent, so that compared with the inorganic nucleating agent added in the subsequent foam material preparation process, the foaming pore density can be remarkably improved.

Inventors

KE CHAOQIAN
HAN YONGMING
ZHAO XIANYING
HAN HUILING

Assignees

宁夏日盛高新产业股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260402

Claims (13)

1. A preparation method of an ADC foaming agent for improving the density of foaming pores is characterized by comprising the following steps of: Mixing the modified inorganic nucleating agent with water according to a preset mass ratio, adding a dispersing agent, and uniformly mixing to prepare uniform and stable suspension slurry; Adding biurea into an oxidation reaction kettle, introducing chlorine gas to perform oxidation reaction, and adding suspension slurry when the biurea conversion rate reaches 80% -85%; and (3) continuing the oxidation reaction until the biurea conversion rate reaches more than 92%, and then washing, centrifuging and drying to obtain the ADC foaming agent.
2. The method for preparing ADC foaming agent for increasing foam cell density as claimed in claim 1, wherein the inorganic nucleating agent is one of nano silicon dioxide, nano calcium carbonate and mesoporous silicon dioxide.
3. The method for preparing the ADC foaming agent for improving the foaming pore density of the foam material as claimed in claim 2, wherein the nano silicon dioxide is modified by a silane coupling agent KH550, and the addition amount of the nano silicon dioxide is 0.5% -2% of the total mass of the ADC foaming agent.
4. The method for preparing ADC foaming agent for improving foaming pore density as claimed in claim 3, wherein the hydroxyl content of the surface of the nano silicon dioxide is more than or equal to 3/nm 2 , and the particle size is 20-50 nm.
5. The method for preparing the ADC foaming agent for improving the foaming pore density according to claim 2, wherein stearic acid is coated on the surface of the nano calcium carbonate, and the addition amount of the nano calcium carbonate is 2% -4% of the total mass of the ADC foaming agent.
6. The method for preparing ADC foaming agent for improving foaming pore density as claimed in claim 5, wherein the activation degree of nano calcium carbonate is more than or equal to 95%, and the particle size is 30-80 nm.
7. The method for preparing the ADC foaming agent for improving the foaming pore density according to claim 2, wherein the mesoporous silica is modified by amination, and the adding amount of the mesoporous silica is 0.3% -1% of the total mass of the ADC foaming agent.
8. The method for preparing ADC foaming agent for improving foam cell density as claimed in claim 7, wherein the specific surface area of mesoporous silica is not less than 600m 2 /g, the particle size is 50-100 nm, and the pore diameter is 2-5 nm.
9. The method for preparing ADC foaming agent for improving foam cell density as claimed in claim 1, wherein the dispersing agent is sodium dodecyl benzene sulfonate, and the adding amount is 0.1% -0.2% of the water mass.
10. The method for preparing ADC foaming agent for improving foam cell density as claimed in claim 1, wherein after adding suspension slurry, the reaction temperature is 35-40 ℃, the pH value of the system is 1.5-2.5, and stirring is continuously carried out in the reaction process.
11. The method for preparing the ADC foaming agent for improving the foaming pore density according to claim 1, wherein the ADC foaming agent is washed by hot water at 60-70 ℃ until the pH value of filtrate is 6-7 during washing.
12. The method for preparing the ADC foaming agent for improving the foaming pore density according to claim 1, wherein during drying, the ADC foaming agent is dried by adopting air flow, the air inlet temperature is 110-120 ℃, and the air outlet temperature is 60-70 ℃.
13. An ADC foaming agent is characterized by being prepared by the method of any one of claims 1-12.

Description

ADC foaming agent for improving foaming pore density and preparation method thereof Technical Field The application relates to the field of foaming agent preparation, in particular to an ADC foaming agent for improving foaming pore density and a preparation method thereof. Background ADC foaming agents (i.e. azodicarbonamide foaming agents) are widely used in synthetic materials such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyamide and various rubbers. Applications include, but are not limited to, slippers, soles, insoles, plastic wallpaper, ceilings, flooring, imitation leather, thermal and acoustic insulation. The ADC foaming agent has the characteristics of stable performance, no inflammability, no pollution, no toxicity and smell, no corrosion to a die, no dyeing to products, adjustable decomposition temperature, no influence on curing and forming speed and the like. The pore density is an important technical direction of transformation from the current foaming material industry to high-performance, low-carbonization and high-added value. In order to improve the pore density, a nucleating agent is doped in the process of preparing the synthetic material, and the mixing is easy to be uneven when the foaming agent and the nucleating agent are mixed with a main material due to the fact that the doping amount of the foaming agent and the nucleating agent is relatively small, so that on one hand, the pore density is uneven, and on the other hand, the pore density is limited. Disclosure of Invention In view of the above, the application provides an ADC foaming agent for improving the density of foaming pores and a preparation method thereof. The preparation method of the ADC foaming agent for improving the foaming pore density comprises the following steps of: Mixing the modified inorganic nucleating agent with water according to a preset mass ratio, adding a dispersing agent, and uniformly mixing to prepare uniform and stable suspension slurry to prevent the nucleating agent from agglomerating; adding biurea into an oxidation reaction kettle, introducing chlorine gas to perform oxidation reaction, and adding suspension slurry when the biurea conversion rate reaches 80% -85%, so that the inorganic nucleating agent is uniformly attached to the surface of ADC crystals; and (3) continuing the oxidation reaction until the biurea conversion rate reaches more than 92%, and then washing, centrifuging and drying to obtain the ADC foaming agent. The ADC foaming agent for improving the foaming pore density is prepared by the method. The preparation method of the ADC foaming agent for improving the foaming pore density has the technical effects that the surface modification treatment is firstly carried out on the inorganic nucleating agent, the inorganic nucleating agent is not easy to agglomerate, and the cell density is relatively uniform. In the later stage of the oxidation reaction process, namely when the biurea conversion rate reaches 80% -85%, the modified inorganic nucleating agent is added, so that the nucleating agent can be prevented from being damaged by a strong oxidation system, and the nucleating agent and ADC crystals can be fully combined. According to the application, the inorganic nucleating agent is added in the preparation stage of the ADC foaming agent, so that compared with the inorganic nucleating agent added in the subsequent foam material preparation process, the foaming pore density can be remarkably improved. Detailed Description Embodiments of the present application will be described in detail below. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application. The preparation method of the ADC foaming agent for improving the foaming pore density comprises the following steps of: step 1, mixing the modified inorganic nucleating agent and water according to a preset mass ratio, adding a dispersing agent, and uniformly mixing to prepare uniform and stable suspension slurry to prevent the nucleating agent from agglomerating; Step 2, when the biurea conversion rate reaches 80% -85%, adding suspension slurry to enable the inorganic nucleating agent to be uniformly attached to the surface of the ADC crystal; And 3, continuing the oxidation reaction until the biurea conversion rate reaches more than 92%, and then washing, centrifuging and drying to obtain the ADC foaming agent. The ADC foaming agent is biurea obtained by oxidizing chlorine. The inorganic nucleating agent has stable chemical property and is not easy to decompose, dissolve or destroy the structure in an acidic and oxidizing environment. Through a large number of experiments, the inorganic nucleating agent is modified, so that the attachment can be completed along with the ADC crystal growth process in the later period of oxidation, and higher bonding strength ca