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Preparation method of nanometer calcium carbonate used for filling of hard PVC

A technology of nano-calcium carbonate and calcium carbonate, which is applied in the direction of nanotechnology, calcium carbonate/strontium/barium, and nanotechnology for materials and surface science, and can solve the problem of yellowing of PVC filled with nano-calcium carbonate and poor dispersion of modifiers. Uniformity, product yellowing and other problems, to achieve the effect of enhancing dispersion and fluidity, maintaining whiteness and stability, slowing down decomposition and aging

Inactive Publication Date: 2021-06-15
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-calcium carbonate has a very high surface energy, so that it will encounter poor fluidity during the processing of rigid PVC, and thus lead to the adverse effects of yellowing and low whiteness of the product. The main reason why the field of rigid PVC is not fully applied
At the same time, how to maximize the high reinforcing effect of nano-calcium carbonate filled with rigid PVC is also a long-term and arduous problem.
[0003] A preparation method of nano-calcium carbonate for rigid PVC filling in Chinese patent (publication number is CN 105694537A) adopts maleic acid-acrylic acid copolymer to carry out wet surface treatment to nano-calcium carbonate, which improves the performance of nano-calcium carbonate-filled rigid PVC Mechanical properties and compatibility; but it does not solve the problems of poor processing performance and yellowing of products filled with nano-calcium carbonate
However, the effects of poor processability and yellowing of products filled with nano-calcium carbonate filling rigid PVC are still not solved.
[0005] A kind of calcium carbonate modification method of Chinese patent and its application in PVC pipe material (publication number is CN 108948793A) adopts dry method modification, is only applicable to the surface modification of small batches of calcium carbonate; if carry out the dry method of large quantities of calcium carbonate Modification, it is easy to cause uneven dispersion of the modifier, so that when calcium carbonate is filled with rigid PVC, the performance of the product fluctuates greatly
[0006] A Chinese patent for the preparation of modified nano-calcium carbonate for PVC injection molding (publication number is CN108676383A) adopts wet modification, saponifies saturated fatty acid and mixes it with phenyl ester and alkanol to modify the surface of nano-calcium carbonate. The prepared nano-calcium carbonate enhances many properties of PVC, but it still cannot solve the problem of yellowing of hard PVC filled with nano-calcium carbonate
[0007] A Chinese patent on a modified calcium carbonate-filled PVC pipe and its preparation method (publication number CN 108504001A) changes the formula of the PVC pipe so that the PVC pipe has the advantages of high strength, high toughness, and aging resistance. Unfortunately, there is still no solution for nanocarbonic acid. Calcium-filled PVC yellowing problem
[0008] In summary, at present there are still many deficiencies about nano-calcium carbonate for rigid PVC filling, especially the problem of yellowing of calcium carbonate-filled PVC products. Existing various preparation and surface modification methods for nano-calcium carbonate , still can not better meet the demand for whiteness of rigid PVC products

Method used

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  • Preparation method of nanometer calcium carbonate used for filling of hard PVC
  • Preparation method of nanometer calcium carbonate used for filling of hard PVC

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Embodiment 1

[0033] A preparation method for filling the nano-calcium carbonate of rigid PVC, comprising the following steps:

[0034] S1: Limestone with a mass content of 0.3% magnesium carbonate is calcined at 1000°C to obtain quicklime, and the quicklime and water are digested at a mass ratio of 1:5 to obtain Ca(OH) 2 , sieve and stand still, and then configure Ca(OH) with a solid content of 12% 2 suspension;

[0035] S2: To Ca(OH) 2 A mixture of 0.3% calcium carbonate on a dry basis mass of sucrose and glucose was added to the suspension as a crystal form control agent, and CO 2 The carbonation reaction is carried out with a mixed gas with a concentration of 20%, and the CO is controlled 2 The flow rate of the mixed gas is 0.02m 2 / h, the reaction temperature is 40°C, and the stirring speed is 500r / min; when the reaction suspension pH=10.0, stop feeding CO 2 ;

[0036] S3: carry out surface modification to the suspension, add the sodium stearate solution that the mass concentrati...

Embodiment 2

[0039]A preparation method for filling the nano-calcium carbonate of rigid PVC, comprising the following steps:

[0040] S1: Limestone with a mass content of 0.2% magnesium carbonate is calcined at 1100°C to obtain quicklime, and the quicklime and water are digested at a mass ratio of 1:7 to obtain Ca(OH) 2 , sieve and let it stand, and then configure it into Ca(OH) with a solid content of 9%. 2 suspension;

[0041] S2: To Ca(OH) 2 Add 0.4% sucrose on a dry basis of calcium carbonate as a crystal form control agent to the suspension, and feed CO 2 The mixed gas with a concentration of 40% is used for carbonation reaction to control CO 2 The flow rate of the mixed gas is 0.01m 2 / h, the reaction temperature is 30°C, and the stirring speed is 800r / min; when the reaction suspension pH=8.5, stop feeding CO 2 ;

[0042] S3: Carry out surface modification to suspension, add the sodium stearate solution that the mass concentration of 40% of calcium carbonate dry basis mass is 5...

Embodiment 3

[0045] A preparation method for filling the nano-calcium carbonate of rigid PVC, comprising the following steps:

[0046] S1: Limestone with a mass content of 0.1% magnesium carbonate is calcined at 1200°C to obtain quicklime, and the quicklime and water are digested at a mass ratio of 1:10 to obtain Ca(OH) 2 , sieve and let it stand, and then configure it into Ca(OH) with a solid content of 6.0%. 2 suspension;

[0047] S2: To Ca(OH) 2 Add 0.5% maltose on a dry basis of calcium carbonate to the suspension as a control agent, and feed CO 2 The mixed gas with a concentration of 30% carries out carbonation reaction and controls CO 2 The flow rate of mixed gas is 0.005m 2 / h, the reaction temperature is 35°C, and the stirring speed is 1000r / min; when the reaction suspension pH=9.2, stop feeding CO 2 ;

[0048] S3: carry out surface modification to the suspension, add the sodium stearate solution that the mass concentration of 50% of calcium carbonate dry basis mass is 70% to...

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Abstract

The invention discloses a preparation method of nanometer calcium carbonate used for filling of hard PVC. The preparation method comprises the following steps: S1, calcining limestone at 1000-1200 DEG C to obtain quick lime, carrying out a digestion reaction on the quick lime and water to obtain Ca(OH)2, and preparing a Ca(OH)2 suspension; S2, adding a crystal form control agent into the Ca(OH)2 suspension, introducing mixed gas of CO2 for a carbonation reaction, and stopping introducing CO2 when the pH value of the reaction suspension is more than 7 and less than or equal to 9; S3, performing surface modification on the suspension, adding a sodium stearate solution into the suspension, then adding a calcium salt solution, and adding a zinc salt solution; and S4, finally carrying out filter pressing, drying and sieving to obtain the nanometer calcium carbonate for filling of the hard PVC. The prepared nanometer calcium carbonate can improve the whiteness of hard PVC, inhibit decomposition, yellowing and aging of a hard PVC material and improve the mechanical properties of a PVC product.

Description

technical field [0001] The invention belongs to the technical field of PVC material preparation, and in particular relates to a preparation method of nano-calcium carbonate used for filling rigid PVC. Background technique [0002] Nano-calcium carbonate is an excellent filler. It is widely used in plastics, coatings, rubber, inks, sealants, and papermaking, but it is not widely used in rigid PVC. There are still many problems in the application. Nano-calcium carbonate is used in rigid PVC, which has a great influence on the dispersibility, whiteness, mechanical properties, and fluidity of the product. Hydrophilic and oleophobic nano-calcium carbonate is easy to agglomerate, and its dispersibility is poor in rigid PVC materials. Therefore, it is necessary to modify the surface of nano-calcium carbonate to make it lipophilic and hydrophobic and improve the dispersion. Nano-calcium carbonate has a very high surface energy, so that it will encounter poor fluidity during the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00B82Y30/00C04B2/10C04B2/04C08K9/04C08K3/26C08K5/098C08L27/06C08L23/28
CPCC01F11/183C01F11/185C01F11/181C04B2/10C04B2/04C08L27/06C01P2006/12C08K2201/011C08K2003/265C08L2201/08C08L23/286C08K9/04C08K3/26C08K5/098
Inventor 李华宇朱勇詹庆铷马建堂黄辉亮
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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