CN103586601A - Method for preparing alginate used for welding materials - Google Patents
Method for preparing alginate used for welding materials Download PDFInfo
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- CN103586601A CN103586601A CN201310609779.2A CN201310609779A CN103586601A CN 103586601 A CN103586601 A CN 103586601A CN 201310609779 A CN201310609779 A CN 201310609779A CN 103586601 A CN103586601 A CN 103586601A
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- alginate
- calcium
- alginic acid
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- solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention provides a method for preparing alginate used for welding materials. According to the method, brown algae are used as a raw material. The technological steps comprise soaking and cleaning the brown algae, adding sodium carbonate into the brown algae for digestion to obtain a glue solution, adding water into the glue solution for dilution, filtering the glue solution to obtain a clear glue solution, converting the clear glue solution and a calcium chloride solution into calcium alginate gel, converting calcium alginate and a hydrochloric acid solution into alginic acid with the calcium content ranging from 0.5% to 1.0%, washing the alginic acid in water till the chlorine ion content of the alginic acid is less than 0.1%, dehydrating and smashing the alginic acid, adding alkali into the solid alginic acid for neutralization, and then drying and smashing the mixture to obtain the alginate with 150-200 meshes. According to the method for preparing the alginate used for the welding materials, the strength, viscosity, calcium content, chloride, granularity, moisture and other indicators, which affect the effects of the alginate in a welding rod coating, of the alginate are controlled, so that the prepared alginate has remarkable effects of enhancing the wet strength and plasticity of components of the welding rod coating when used in a welding rod coating hygroscopic state coagulant, and the rate of finished products of welding rods is increased.
Description
Technical field
The invention belongs to the technical field of marine alga processing, be specifically related to the preparation method of alginate for a kind of welding material.
Background technology
The making of electrode coating is to be generally dry mixed by the selected medicinal powder of formula, then in dry powder, adds gradually waterglass, and constantly stirs, and reaches partly wet, have certain fluidity and can pinch agglomerating state to medicinal powder.Adhesive waterglass humidity cohesion and wettability conventional in welding rod are bad, add after alginate, can make wet strength be improved, plasticity and the slickness of crust have been strengthened simultaneously, in welding rod extrusion modling, can guarantee that crust can not be out of shape and break, guarantee that crust and core wire have maximum concentricity, alginate ashing immediately when welding simultaneously, make the minimizing of splashing of electric welding process, play the effect of stable arc.
Alginate quality directly affects the processing performance of electrode coating, moisture effects is to alginate storage process viscosity stability, particle size influences medicinal powder mixes and the slickness of coating, viscosity and intensity comprehensive function affect mobility, cohesiveness and the plasticity of medicinal powder, in alginate, chloride ion content is greater than 0.1%, can make pad easily be corroded, and existing production technology, the alginate extracting is for electrode coating, and cohesiveness and plasticity are undesirable.
It is generally acknowledged that sodium alginate or potassium alginate mainly play close-burning effect, calcium alginate mainly works to strengthen coating plasticity, intensity, the composite use humidification of common two class.Dispel the chloride in alginate, extraction process adopts organic solution to make the mode of medium neutralization, and this is also relatively in solid phase method and increased cost.
About welding material, by the data of alginate, have a lot, relevant for sodium alginate technology of preparing, also to have fill a prescription requires, as patent CN102554510A stainless steel electrode selects calcium alginate as the organic matter constituents of welding rod; Patent CN101927409A titanium-calcium stainless steel A 022 electric welding rod selects potassium alginate, calcium alginate to improve coating intensity; Patent CN1481969A Welding electrode for high manganese carbon steel rail selects sodium alginate to make plasticizer, above patent only selects alginate to improve the performance of coating from formula, but welding material is carried out total quality requirement and forms have not been reported of specific technology of preparing with alginate.
Summary of the invention
The invention provides the preparation method of alginate for a kind of welding material, the present invention is by controlling the preparation process of alginate, control its intensity, viscosity, chlorine residual, calcium content, moisture, granularity within the specific limits, to reach in electrode coating better effect.
For achieving the above object, the present invention is achieved by the following technical solutions:
A preparation method for alginate for welding material, comprises the steps:
(1) choose the brown alga that in alginic acid, mannuronic acid-content is 40-65%, be soaked in water, clean, alkali digestion, digestion reaction is controlled 55-65 ℃ of temperature, time 10-14h, obtains digestion glue;
(2) described digestion glue is diluted with water, and isolated by filtration obtains clear glue solution;
(3) clear glue solution reacts and is converted into calcium alginate gel with calcium chloride solution, and the hydrochloric acid solution of service property (quality) mark 0.1-0.6% is converted into by calcium alginate gel the alginic acid that calcium mass ratio is 0.5-1.0%;
(4) alginic acid is washed with water to its chloride ion content and is less than 0.1%, dewaters to moisture 60-70%, pulverizes;
(5) under the alginic acid solid conditions of pulverizing, be neutralized to pH 6-8 with alkali;
(6) being dried to moisture is 8-13%, pulverizes, and obtains alginate finished product.
Further improvement to technique scheme: the alginate product viscosity obtaining is 300-700mpa.s, and gel strength is less than 300g/cm
2, calcium content 0.5-1.0%, chloride content is less than 0.1%, moisture 8-13%.
Further improvement to technique scheme: described alginate is sodium alginate, potassium alginate or calcium alginate.
Further improvement to technique scheme: in described step (5), neutralization can be sodium carbonate or potash with alkali.
Further improvement to technique scheme: described step is crushed to 150-200 order in (6).
Compared with prior art, advantage of the present invention and good effect are: the present invention utilizes alginic acid leaching process, in alginic acid, calcium content is high is conducive to reduce hydrochloric acid and uses and improve washing, dehydrating effect and come to improve alginic acid purity, reaches the effect that residues of chloride in alginate is dispelled in liquid phase method neutralization; The present invention uses solid phase method to prepare welding rod alginate, and its production cost reduces, and operating procedure is simple; Alginate medium viscosity is 300-700mpa.s simultaneously, and gel strength is less than 300g/cm
2, calcium content 0.5-1.0%, chloride content is less than 0.1%, moisture 8-13%, the described alginate making possesses good cohesiveness and plasticity effect simultaneously, improves the application performance of alginate in welding rod.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention is further detailed explanation.
Embodiment 1
Alginic acid consists of with position isomer two kinds of mannuronic acid and guluronic acids, uses the sodium alginate of different mannuronic acid-contents in welding material, to use contrast test:
Select different brown alga (business is all known by mannuronic acid and guluronic acid content value in the alginic acid of its extraction of brown alga, and mannuronic acid-content of the present invention refers to that mannuronic acid accounts for the ratio of mannuronic acid and guluronic acid total amount) to extract respectively the sodium alginate of mannuronic acid-content 32%, 48%, 59%, 70% welding rod specification.Welding rod coating recipe is CaCO
360g, CaF
260g, TiO
2330g, SiO
230g, potassic feldspar 150g, electrolyte Mn 50g, Cr 150g, Ni 150g, Fe-Mo 50g, cellulose 10g, sodium alginate 5g, mixes with 180ml potassium silicate after above medicinal powder is mixed.
Result of the test shows: the alginates of mannuronic acid-content 32% do not have the effect that strengthens electrode coating plasticity, and the effect that other 3 kinds of alginates increase coating plasticity is better; In reality, mannuronic acid-content is more difficult higher than its extraction of alginates of 70%, brown alga raw material is also more rare, and we mainly select the alginate of mannuronic acid-content 40 ~ 65%, and select the brown alga that can extract this alginate.
Embodiment 2
Described in the present embodiment, welding material comprises the following steps by the preparation method of alginate:
1, select bulk kelp (in the alginic acid of extraction, mannuronic acid accounts for the ratio of mannuronic acid and guluronic acid total amount, and mannuronic acid-content is 45%), soak, clean, add alkali at 62 ℃, react and must digest glue in 12 hours;
2, digestion glue is diluted with water, and isolated by filtration obtains clear glue solution.
3, clear glue solution and calcium chloride solution transform and obtain calcium alginate gel, and the hydrochloric acid solution that calcium alginate gel is 0.4% at stirring with mass fraction reacts the alginic acid that obtains calcium content 0.7%.Control concentration of hydrochloric acid, reach the object of controlling chlorinity, calcium content in alginic acid.
4, alginic acid is washed with water to its chloride ion content and is less than 0.1%, dewaters to moisture 57%, pulverizes.
5, alginic acid reacts to pH6-8 in reactor with powdered sodium carbonate.
6, dry, pulverize to 150 orders and obtain sodium alginate product.
Detect the sodium alginate product (alginates 1% solution viscosity, 1% solution strength, calcium content, chloride content, moisture content index) finally obtaining: viscosity 350mpa.s, intensity 250g/cm
2, calcium content 0.8% chloride content < 0.1%, moisture 11%.
Embodiment 3
Described in the present embodiment, welding material comprises the following steps by the preparation method of alginate:
1, select sea-tangle (in the alginic acid of extraction, mannuronic acid-content accounts for 55%), soak, clean, add 55 ℃, alkali, react 11 hours;
2, digestion glue is diluted with water, and isolated by filtration obtains clear glue solution.
3, clear glue solution and calcium chloride solution transform and obtain calcium alginate gel, and the hydrochloric acid that calcium alginate gel is 0.5% in stirring and concentration reacts and obtains alginic acid.
4, alginic acid is washed with water to its chloride ion content and is less than 0.1%, dewaters to moisture 60%, pulverizes.
5, solid-state alginic acid reacts to pH6-8 in reactor with potassium carbonate powder.
6, dry, pulverize to 170 orders, obtain alginate product.
Detect the potassium alginate product (alginates 1% solution viscosity, 1% solution strength, calcium content, chloride content, moisture content index) finally obtaining: 300mPas, intensity 200g/cm
2, calcium content 0.6%, chloride content < 0.1%, moisture 11%.
Above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (5)
1. a preparation method for alginate for welding material, is characterized in that comprising the steps:
(1) choose the brown alga that in alginic acid, mannuronic acid-content is 40-65%, be soaked in water, clean, alkali digestion, digestion reaction is controlled 55-65 ℃ of temperature, time 10-14h, obtains digestion glue;
(2) described digestion glue is diluted with water, and isolated by filtration obtains clear glue solution;
(3) clear glue solution reacts and is converted into calcium alginate gel with calcium chloride solution, and the hydrochloric acid solution of service property (quality) mark 0.1-0.6% is converted into by calcium alginate gel the alginic acid that calcium mass ratio is 0.5-1.0%;
(4) alginic acid is washed with water to its chloride ion content and is less than 0.1%, dewaters to moisture 60-70%, pulverizes;
(5) under the alginic acid solid conditions of pulverizing, be neutralized to pH 6-8 with alkali;
(6) being dried to moisture is 8-13%, pulverizes, and obtains alginate finished product.
2. the preparation method of alginate for a kind of welding material according to claim 1, it is characterized in that the alginate product viscosity obtaining is 300-700mpa.s, gel strength is less than 300g/cm2, calcium content 0.5-1.0%, chloride content is less than 0.1%, moisture 8-13%.
3. the preparation method of alginate for a kind of welding material according to claim 1 and 2, is characterized in that described alginate is sodium alginate, potassium alginate or calcium alginate.
4. the preparation method of alginate for a kind of welding material according to claim 1 and 2, is characterized in that in described step (5), neutralization can be sodium carbonate or potash with alkali.
5. the preparation method of alginate for a kind of welding material according to claim 1 and 2, is characterized in that being crushed to 150-200 order 2 in described step (6).
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| CN201310609779.2A CN103586601B (en) | 2013-11-27 | 2013-11-27 | The preparation method of alginate for a kind of welding material |
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| CN201310609779.2A CN103586601B (en) | 2013-11-27 | 2013-11-27 | The preparation method of alginate for a kind of welding material |
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| CN103586601B CN103586601B (en) | 2016-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105111329A (en) * | 2015-09-15 | 2015-12-02 | 常州市鼎日环保科技有限公司 | Method for preparing calcium alginate |
| CN108191993A (en) * | 2017-12-26 | 2018-06-22 | 青岛明月海藻集团有限公司 | A kind of sodium alginate and its preparation method and application |
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| CN101585890A (en) * | 2008-06-20 | 2009-11-25 | 青岛聚大洋海藻工业有限公司 | Method for preparing sodium alginate from kelp |
| US20100256090A1 (en) * | 2007-12-29 | 2010-10-07 | Chuanxing YU | Alginic Acid with Low Molecular Weight, Its Salts, Uses, Preparative Methods, Pharmaceutical Compositions and Foods |
| CN102977224A (en) * | 2012-12-21 | 2013-03-20 | 青岛明月海藻集团有限公司 | Method for preparing calcium alginate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105111329A (en) * | 2015-09-15 | 2015-12-02 | 常州市鼎日环保科技有限公司 | Method for preparing calcium alginate |
| CN108191993A (en) * | 2017-12-26 | 2018-06-22 | 青岛明月海藻集团有限公司 | A kind of sodium alginate and its preparation method and application |
| WO2019128156A1 (en) * | 2017-12-26 | 2019-07-04 | 青岛明月海藻集团有限公司 | Sodium alginate, preparation method therefor and application thereof |
| CN108191993B (en) * | 2017-12-26 | 2019-07-26 | 青岛明月海藻集团有限公司 | A kind of sodium alginate and its preparation method and application |
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| CN103586601B (en) | 2016-05-11 |
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