Preparation method of nano calcium carbonate suspension used for natural rubber latex reinforcement

A nano-calcium carbonate, natural latex technology, applied in fibrous fillers, dyed low-molecular-weight organic compound treatment, dyed organic silicon compound treatment and other directions, can solve the problem that the reinforcement effect of nano-calcium carbonate particles cannot be fully displayed, affecting nano-carbonic acid Calcium/natural rubber latex product performance and other issues, to achieve superior performance and enhance the effect of force

Inactive Publication Date: 2013-01-23
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the small size of the nanomaterial particles, the modified nano-calcium carbonate particles treated with stearic acid are extruded and bonded into small groups, and the surface of the modified nano-calcium carbonate has strong hydrophobicity; if the compounding agent is diluted with water to a certain concentration Then add modified nano-calcium carbonate particles to stir, or directly add modified nano-calcium carbonate particles to the compound agent diluted with water to a certain con

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: take by weighing 75g average particle diameter 80nm and put into container through stearic acid surface modification nano-calcium carbonate, then slowly add the ethanol of 37.5g pure concentration and gamma -Aminopropyltriethoxysilane coupling agent complex agent (ethanol and gamma - The weight ratio of aminopropyltriethoxysilane coupling agent is 1:1, fully stir before adding); seal the container mouth with plastic film, and let the compounding agent Slowly penetrate to the surface of nano-calcium carbonate. At this time, a layer of water film (0.05mm) can be observed on the upper surface of nano-calcium carbonate in the beaker. Then add 630g of water and stir to form a uniform flow containing 10.1% nano-calcium carbonate. Good suspension. Then the suspension is slowly added to the stirring 4032g natural latex to obtain the natural latex reinforced by nano-calcium carbonate (converted into 3.1 parts of nano-calcium carbonate per 100 parts of dry natural ...

Embodiment 2

[0023] Embodiment 2: take by weighing the Virahol of 50g pure concentration and gamma - Glycidoxypropyl trimethoxysilane coupling agent complex agent (isopropanol and gamma -The weight ratio of glycidoxypropyltrimethoxysilane coupling agent is 1:1, fully stir before placing the container) into the container, then slowly add 100g of hardened Surface modification of nano-calcium carbonate with fatty acid; seal the mouth of the container with a plastic film, and let it stand for 31 minutes at room temperature at 30°C to allow the compounding agent to slowly penetrate into the surface of nano-calcium carbonate. At this time, nano-calcium carbonate in the beaker can be observed A layer of water film (0.05mm) appears on the upper surface, then add 840g of water and stir to form a uniform suspension containing 10.1% nano-calcium carbonate; then slowly add the suspension to the 5377g stirring In the natural rubber latex, the natural rubber latex reinforced by nano-calcium carbonate (...

Embodiment 3

[0024]Embodiment 3: take by weighing 80g mean particle diameter 40nm and put into container through stearic acid surface modification nano-calcium carbonate, then slowly add the ethanol of 44g pure concentration and gamma -Aminopropyltriethoxysilane coupling agent complex agent (ethanol and gamma - The weight ratio of aminopropyltriethoxysilane coupling agent is 1:1.2, stir well before adding); seal the mouth of the container with a plastic film, and let it stand for 33 minutes at room temperature at 28°C to allow compound modification The agent slowly penetrates to the surface of nano-calcium carbonate. At this time, a layer of water film (0.05mm) can be observed on the surface of nano-calcium carbonate in the beaker. Then add 736g of water and stir to form a uniform flow containing 9.3% nano-calcium carbonate. Good suspension; then the suspension is slowly added in the stirring 4762g natural latex to obtain the natural latex reinforced by nano-calcium carbonate (converted in...

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Abstract

A preparation method of nano calcium carbonate suspension used for natural rubber latex reinforcement comprises the following steps: mixing pure concentration of organic alcohol and silane coupling agent, and fully and uniformly stirring to prepare a complexing agent, the weight ratio of the organic alcohol and silane coupling agent being 1 : 0.8-1.4; weighing 100 parts by weight of surface-modified nano calcium carbonate by stearic acid to slowly mix with 45 to 60 parts by weight of the complexing agent to prepare a mixed liquid; sealing the mixed liquid in a container, allowing the container to stand at room temperature, so that the complexing agent is slowly penetrated into the surface of the nano calcium carbonate until a layer of water film is observed to appear on the surface of the nano calcium carbonate, then adding 800 to 950 parts of water, and uniformly stirring to prepare the nano calcium carbonate suspension used for natural rubber latex reinforcement. The method uses relatively little amount of the complexing agent, and can ensure a uniform contact of the complexing agent with the stearic acid on the surface of the modified nano calcium carbonate particles.

Description

technical field [0001] The invention relates to a preparation method of nanometer calcium carbonate suspension used for natural rubber latex reinforcement. technical background [0002] Natural rubber latex has the characteristics of high viscosity and poor fluidity. In order to ensure the uniformity of the added solid material in the natural rubber latex, the solid material is usually prepared into a certain concentration of solution or suspension; when preparing the suspension, the suspension must also be Appropriate fluidity, and then add the suspension to the natural rubber latex being stirred, this method is called liquid-liquid method. [0003] Nano-calcium carbonate materials have a large specific surface area and are easy to coagulate, and the surface of nano-calcium carbonate particles is hydrophilic and oleophobic, and the direct binding force with rubber and other polymer interfaces is weak, so manufacturers generally use stearic acid to modify the surface of nano...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08C09C3/12C08L7/02C08K9/06C08K9/04C08K3/26
Inventor 陈美敖宁建王永周黄茂芳张福全
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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