CN1076678A - Keene's cement - Google Patents

Keene's cement Download PDF

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Publication number
CN1076678A
CN1076678A CN 93110730 CN93110730A CN1076678A CN 1076678 A CN1076678 A CN 1076678A CN 93110730 CN93110730 CN 93110730 CN 93110730 A CN93110730 A CN 93110730A CN 1076678 A CN1076678 A CN 1076678A
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CN
China
Prior art keywords
keene
anhydrite
cement
semi
gypsum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 93110730
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Chinese (zh)
Inventor
唐修仁
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Southeast University
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Southeast University
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Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN 93110730 priority Critical patent/CN1076678A/en
Publication of CN1076678A publication Critical patent/CN1076678A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Keene's cement, a kind of gypsum is a material of construction, mainly adds potassium bichromate and/or sodium oxalate by anhydrite, can also mix semi-hydrated gypsum.It is characterised in that 100 parts of anhydrite, 0.5～2 part of catalyzer, 1～10 part of semi-hydrated gypsum, the present invention is with anhydrite process ball milling or ultra-fine mill, improve its specific surface area like this, add and added effective catalyzer, thereby improved the early hydration rate of keene's cement, shorten the presetting period, made goods have more weather resistance.

Description

Keene's cement
The present invention is that a kind of gypsum is a material of construction, forms agglutinate with anhydrite and catalyzer, can produce various building products.
The past plastering is all based on semi-hydrated gypsum, and its setting and harden speed is very fast, but intensity is lower.At present, the application of dehydrated gyp-increases gradually, and let it be to the greatest extent, and setting and harden speed is generally slower, but its intensity is higher, begins to be subjected to user's welcome.About dehydrated gyp-, natural II type dehydrated gyp-is arranged, useful chemical industry by-product dihydrate gypsum also has fluorgypsum through 600～1000 ℃ of II type dehydrated gyp-s that are sintered into, and these are referred to as anhydrite.In the middle of the anhydrite, II type dehydrated gyp-, when independent and water was in harmonious proportion, its setting and harden was chronic, does not generally have Practical significance, so in the keene's cement, must mix catalyzer, improves its hydration rate.In the existing utilisation technology, catalyzer mostly is soluble sulphate, and as the public clear 58-14384 of spy, special public clear 58-6701 is among the special public clear 58-60648, all with K 2SO 4Be main, also have Al 2(SO 4) 3And alum, other also have Na 2SO 4, FeSO 4, CuSO 4Deng.There is a common problem in these keene's cements, the aquation rate that is exactly anhydrite is lower, generally 30～40%, there is still unhydrated in a large number anhydrite in the anhydrite product, in use as water or make moist, anhydrite also will continue aquation, produces bigger volumetric expansion, makes the goods cracking.
The present invention is directed to the problem that above-mentioned anhydrite product exists, proposed a kind of keene's cement that makes by chemistry and physical method.
Keene's cement of the present invention mainly is to add catalyzer in anhydrite.Anhydrite promptly is an II type anhydrous calciumsulphate, can select 100 parts for use; Catalyzer can be selected potassium bichromate (K for use 2Cr 2O 7) or sodium oxalate (NaC 2O 4) or the mixture of potassium bichromate and sodium oxalate, the component of every kind of catalyzer is all 0.5～2 part, in addition, if will shorten the time of coagulation of keene's cement, improves the early hydration rate relatively, can mix hydration rate semi-hydrated gypsum faster.
In above-mentioned keene's cement, anhydrite becomes ultra-fine mill to handle through ball milling, and its specific surface area has reached 5000～10000cm 2/ g.
Keene's cement of the present invention owing to improved the specific surface area of anhydrite, has added effective catalyzer, thereby has improved the early hydration rate of keene's cement, has shortened the presetting period, makes goods have more weather resistance.
Embodiments of the invention are as follows:
Anhydrite can be natural II type anhydrous calciumsulphate; It can be fluorgypsum; Also can be that chemical gypsum is through 600～1000 ℃ of dehydrated gyp-s that are sintered into; They are handled through ball milling or ultra-fine mill, and specific surface area is 5000～10000cm 2/ g, preferably 7000-8000cm 2/ g.
In the keene's cement, if mix semi-hydrated gypsum, its component is 1～10 part, and semi-hydrated gypsum can be an alpha semi-hydrated gypsum, also can be beta-type semi-hydrated gypsum (being plaster of Paris).

Claims (4)

1, keene's cement, a kind of gypsum is a material of construction, it is characterized in that anhydrite, promptly the component of II type anhydrous calciumsulphate is 100 parts, mixes one of following catalyzer of 0.5～2 part:
A. potassium bichromate (K 2Cr 2O 7);
B. sodium oxalate (N 2C 2O 4);
C. the mixture of potassium bichromate and sodium oxalate.
2, keene's cement according to claim 1 is characterized in that above-mentioned agglutinate, can mix 1＜semi-hydrated gypsum＜10.
3, keene's cement according to claim 1 is characterized in that anhydrite is to handle through ball milling or ultra-fine mill, and its specific surface area is 5000-10000cm 2/ g, preferably 7000-8000cm 2/ g's is one of following:
A. natural II type dehydrated gyp-;
B. fluorgypsum;
C. chemical gypsum is through 600-1000 ℃ of dehydrated gyp-that is sintered into.
4, keene's cement according to claim 1 is characterized in that semi-hydrated gypsum can be one of following:
A. alpha semi-hydrated gypsum;
B. beta-type semi-hydrated gypsum (being plaster of Paris).
CN 93110730 1993-03-20 1993-03-20 Keene's cement Pending CN1076678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 93110730 CN1076678A (en) 1993-03-20 1993-03-20 Keene's cement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 93110730 CN1076678A (en) 1993-03-20 1993-03-20 Keene's cement

Publications (1)

Publication Number Publication Date
CN1076678A true CN1076678A (en) 1993-09-29

Family

ID=4988562

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 93110730 Pending CN1076678A (en) 1993-03-20 1993-03-20 Keene's cement

Country Status (1)

Country Link
CN (1) CN1076678A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110128045A (en) * 2019-04-30 2019-08-16 江苏一夫科技股份有限公司 II type anhydrous gypsum fast hydration exciting agent of one kind and fast hydration method
CN111875273A (en) * 2020-08-13 2020-11-03 江苏一夫科技股份有限公司 High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof
CN112250405A (en) * 2020-10-15 2021-01-22 江苏一夫科技股份有限公司 Fluorgypsum-based plastering material and preparation method and application thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110128045A (en) * 2019-04-30 2019-08-16 江苏一夫科技股份有限公司 II type anhydrous gypsum fast hydration exciting agent of one kind and fast hydration method
CN111875273A (en) * 2020-08-13 2020-11-03 江苏一夫科技股份有限公司 High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof
CN112250405A (en) * 2020-10-15 2021-01-22 江苏一夫科技股份有限公司 Fluorgypsum-based plastering material and preparation method and application thereof

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C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C01 Deemed withdrawal of patent application (patent law 1993)
WD01 Invention patent application deemed withdrawn after publication