Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of modified calcium sulfate whisker

A calcium sulfate whisker and modification technology, which is applied in the field of paper-making fillers, can solve problems such as the decline of filler effects, and achieve the effects of low pollution, improved coating rate, and low production costs

Active Publication Date: 2018-01-16
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even in the process of preparing "submicron" and "nanometer" size filler particles, due to the reasons of the preparation process and the material properties of the filler itself, it will inevitably cause the aggregation and distribution of the particle surface charges. A direct result is that the prepared Good particles produce "agglomeration". During use, the size of the agglomerated particles is several or even dozens of orders of magnitude larger than the size before the agglomeration, resulting in the decline of the effect of the above fillers.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of modified calcium sulfate whisker
  • A kind of preparation method of modified calcium sulfate whisker
  • A kind of preparation method of modified calcium sulfate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Calcium sulfate whiskers with a length of 11 μm and a diameter of 1.1 μm are raw material A.

[0035] Add 85g of deionized water and 5g of cornstarch to a glass reactor with a thermometer, a stirrer, a drop-adding device, and a reflux condenser of a nitrogen inlet tube. Under stirring, heat up to 80°C for gelatinization, and keep the temperature for 2.5 hours. After cooling to 50°C, 10 ml of an aqueous solution containing 0.5 g of sodium hexametaphosphate was added dropwise within 0.5 hours, and kept at 50°C for 5 hours to terminate the reaction. Adjust the pH to 11 with 30% aqueous sodium carbonate solution to obtain B.

[0036] Proportion:

[0037] A: 50 (parts by mass)

[0038] B: 50 (parts by mass)

[0039] Add A into the chamber of the spray dryer, open the airflow device, and raise the temperature at the same time until the temperature in the reaction kettle reaches 50°C. Start the peristaltic pump to inject the liquid; maintain the temperature and blowing sp...

Embodiment 2

[0041] Calcium sulfate whiskers with a length of 8.5 μm and a diameter of 1.3 μm are raw material A.

[0042] Prepare a thermometer, a stirrer, a drop-adding device, and add 170 g of water and 8 g of cornstarch into the glass reactor of the reflux condenser of the nitrogen inlet tube. Under stirring, heat up to 85°C for gelatinization, and keep the temperature for 2 hours. After cooling to 50°C, 10 ml of an aqueous solution containing 0.35 g of sodium tripolyphosphate was added dropwise within 0.3 hours, and kept at 50°C for 3 hours to terminate the reaction. Adjust the pH to 11 with 30% aqueous sodium carbonate solution to obtain B.

[0043] Proportion:

[0044] A: 50 (parts by mass)

[0045] B: 45 (parts by mass)

[0046] A is added to the cavity of the spray dryer 1, the air flow device is turned on, and the temperature is raised at the same time until the temperature in the reaction kettle reaches 55°C. Start the peristaltic pump to inject the liquid; maintain the tem...

Embodiment 3

[0048] Calcium sulfate whiskers with a length of 5.3 μm and a diameter of 0.75 μm were raw material A.

[0049] Add 170 g of water and 8.5 g of cornstarch to a glass reactor equipped with a thermometer, a stirrer, a drop-adding device, and a reflux condenser of a nitrogen inlet tube. Under stirring, heat up to 85°C for gelatinization, and keep the temperature for 1.5 hours. After cooling to 55°C, 10ml of a mixed aqueous solution containing 0.3g of sodium tripolyphosphate and 0.2g of sodium hexametaphosphate was added dropwise within 0.2 hours, and kept at 55°C for 1 hour to complete the reaction. Adjust the pH to 10.5 with 30% aqueous sodium carbonate solution to obtain B.

[0050] Proportion:

[0051] A: 50 (parts by mass)

[0052] B: 35 (parts by mass)

[0053] A is added to the cavity of the spray dryer 1, the air flow device is turned on, and the temperature is raised at the same time until the temperature in the reaction kettle reaches 65°C. Start the peristaltic pum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

Belonging to the technical field of papermaking filler, the invention particularly relates to a preparation method of a modified calcium sulfate whisker. The method includes: making starch and deionized water respectively into a slurry with a concentration of certain mass percentage, performing uniform stirring, conducting heating to 70-100DEG C and carrying out gelatinization, maintaining a constant temperature for 1.5-2.5h to obtain a starch slurry; making a cross-linking agent and deionized water into a cross-linking agent solution of certain concentration; cooling the starch slurry to 45-60DEG C, then dropping the starch slurry into the cross-linking agent solution at a constant speed within 0.2-0.5h, carrying out constant temperature reaction for 1-5h, then adjusting the pH value to 11 with an alkaline solution; and subjecting calcium sulfate whisker and the cross-linked starch solution in a mass part ratio of 50:20-50 to spray drying treatment by a spray dryer to obtain modified calcium sulfate whisker. By adding the cross-linking agent, the preparation method can greatly increase the starch coating rate; through modification of the calcium sulfate whisker, the whisker does not agglomerate, and the method gives consideration to the filler size and the interaction effect of the filler and paper fiber; the method provided by the invention does not involve organic solvent, only adopts water as the medium, and has the advantages of low production cost, small pollution, low energy consumption and high yield.

Description

technical field [0001] The invention belongs to the technical field of papermaking fillers, in particular to a preparation method of modified calcium sulfate whiskers. Background technique [0002] In the pulping and papermaking process, filler technology is generally used. Commonly used fillers include heavy calcium (natural CaCO3 abrasive), light calcium (synthetic process), various silica grade calcium sulfate crystals and other inorganic fillers. Calcium sulfate whisker is a new type of inorganic material with high comprehensive performance, which is different from plant fibers and traditional fillers such as calcium carbonate and talcum powder. It is a new type of fibrous material between plant fibers and traditional fillers, and has some special properties that traditional fillers do not have, such as good dimensional stability, heat resistance, chemical resistance, flame retardancy and electrical insulation These properties are unmatched by plant fibers; enhanced hig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/69C30B29/62C30B29/46
CPCC30B29/46C30B29/62D21H17/69
Inventor 徐莉赵敏童敏程雲张红卫瑞
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS