CN1127173A

CN1127173A - Natural nontoxic adhesive filming agent for wet type molding sand

Info

Publication number: CN1127173A
Application number: CN 95100255
Authority: CN
Inventors: 刘玉满
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-21
Filing date: 1995-01-21
Publication date: 1996-07-24
Anticipated expiration: 2015-01-21
Also published as: CN1041288C

Abstract

The recipe of adhesive filming agent mainly consists of starch, dust of stalk cellulose, dust of perfume oil bearing arbor and bush and dry dregs of cane molasses, which are mixed into dry firming natural toxicless organic mater with, mesh three-dimensional molecular configuration then the product is made up after uniformly infiltration of the surfactant ferrous oxide powder and inorganic mineral powder. It will not produce harmful gas and stiulating smoke when using but can send out fragrance. It has no strictly demand to the raw sand, it can be milled together with the new and old core sand with any proportion, the phenomena of ball forming, sticky, sticking to the mould etc. will not occur. It is suitable to the wet process to cast high grade, fine and large-size foundry goods.

Description

Tidal stencils casting sand Nantural non-toxic adhesive filming agent

The present invention relates to a kind of moulding sand for casting adhesive filming agent, the Nantural non-toxic adhesive filming agent that particularly a kind of suitable tidal stencils casting sand is used.

During foundry industry is produced at present, typically use synthetic self-hardening resins such as phenolic resins, Lauxite, furfuryl alcohol phenolic resins as sand binder, contain compositions such as toxic bigger free phenol, free formaldehyde in this type of synthetic resin, volatilization has a strong impact on workers'health in the space when mix molding sand and cast.As everyone knows, the field of tidal stencils casting is more more wide than dry sand casting, because the tidal stencils casting has advantages such as cost is low, easy to operate, environmental pollution is little, has become the main developing direction of foundry industry.But because of preparation technique requirement high, the difficult forming of present tidal stencils casting to molding sand, the type wall is loose, fineness is low, is difficult to cast out high accuracy, high-quality foundry goods, has limited it and has applied.For being watered, the tidal stencils casting casts out high-quality senior foundry goods, founder author only is confined to prepare on the sand, soil, coal, water four key elements of molding sand and does unremitting exploration, to scheme to adopt super sea coal, bentonite, roughing sand and alap moisture content, produce the high-quality tidal stencils foundry goods that to compare with synthetic self-hardening resin sand, but all do not have actual effect.

It is low to the objective of the invention is to disclose a kind of production cost, is convenient to machine moulding, sand mold surface smoothness height, and good permeability, the senior foundry goods of can casting, be suitable for the Nantural non-toxic adhesive filming agent of tidal stencils casting especially.

For ease of introducing, the technology of the present invention is described in detail below in conjunction with embodiment.

For achieving the above object, our research direction is that will to make a kind of charing rate slow, soluble in water again, both had certain bonding force,, had certain from doing curing property with after molding sand mixes, can form the overlay film layer of higher-strength at mo(U)ld face, and after the cast fabulous collapsibility is arranged, and and it is not sticky under wetting state, the molding sand adhesive filming agent of nontoxic, the nonirritant flue gas of not conglomeration.For this reason, we have adopted the Main Ingredients and Appearance of the dry and solid characterisc organic matter of mesh build molecular structure for prescription.Concrete prescription is: (by weight, gross weight is 100%),

Starch 30-50%

Straw cellulose chip of stalk 15-25%

Filling, arbor broken last 10-20%

Sucrose dense dry residue 3-5%

Ferrous oxide powder 1-1.5%

Inorganic mineral powder 0-15%

Wherein each plant material water content＜3%, mix plant material earlier, in proportion through 120-160 ℃ of slakings, dehydration granularity≤2 millimeter, pulverizing is after 100 mesh sieves, in proportion ferrous oxide powder and inorganic mineral powder infiltrated to mix then just to make finished product.

Starch in the prescription uses senior α starch or β starch natural energy in order to be effective, and just cost is too high, there is no need.Fern root class plant tuber nontoxic, that gum level is higher or general potato class, grain kind of starch have been used just.It is the primary raw material in the prescription, and the height of its content is decided on the chiltern situation of molding sand.Described straw cellulose chip of stalk is as molding sand plasticity conditioning agent in prescription, preferably uses the broken end of bagasse cellulose, because of the fibre strength height of its fibre strength than straw such as corn, Chinese sorghum, standing grain wheat stalk, and contains higher wood tar, and charing rate is slow, and ash is few; The broken end of described shrub and arbor, be to make brightener in prescription, its kind scope of selecting for use is very wide, all wooden solid, free from extraneous odour during burning, contain that the resinoid shrub and arbor of aromatic oil such as black mortar, eucalyptus are flat, peach monarch grain class shrub and arbor primibranch, leaf, root, fruit can both use after pulverizing, and be wherein best with the result of use at the broken ends of branches and leaves of Lauraceae class plants such as Da Ye camphor tree or leaflet camphor again; Described sucrose dense dry residue is exactly the sucrose factory granulated slag that remaining waste liquid post precipitation oven dry makes when practicing sugar, its in prescription as molding sand green compression strength reinforcing agent; Ferrous oxide powder is as surfactant in prescription, to eliminate the subcutaneous blowhole of foundry goods; Described inorganic mineral powder is as property regulation, no matter is barite or can uses from marble, calcite, talcum or the like.

Promptly as seen, the used raw material of this neoteric molding sand adhesive filming agent all is nontoxic natural materials, not only can not produce the toxicity that is detrimental to health during use from disclosed prescription, and irritating flue gas is the flavor that can give out a sweet perfume on the contrary; Help improving production environment; Soluble in water because of its finished product, under any condition with the molding sand mixed grind, conglomeration, sticky shape can not appear; Molding sand quality with its preparation is soft and moist, and toughness, plasticity are good, sticking to mould not, and the type wall energy forms the higher overlay film bright layer of intensity naturally, after doing certainly more satisfactory strength and stiffness, hardness is arranged; The present invention does not all have overcritical to the granularity of roughing sand (no matter being fresh sand or old sand), shape, clay content, moisture content etc.; But even also adapted all of once repeatedly used repeatedly old sand; Can control ideally molding sand moisture content, so be beneficial to high pressure or gas especially towards moulding; The sand permeability of being joined is generally more than 160, and the utmost point is beneficial to the elimination gas hole defect, and the casting mold chalking resistance that is become is strong, after air-dry, the adhesion strength of mo(U)ld face is better, the graphitization expansion the when utmost point is beneficial to and prevents that magnesium iron from solidifying, and high-precision level and heavy castings are highly suitable for casting.Because the main component of adhesive filming agent of the present invention is the very strong organic matter of heat sensitivity, at high temperature slowly promptly form reducing gas and the peelable viscosity sand layer of preventing the scab works very well after the charing, collapsibility is good especially, the easily demoulding, anti-burning into sand, and its old sand does not need any regeneration to handle can mixed grind to reuse, greatly reduce the castings production cost.

Claims

1, a kind of moulding sand for casting adhesive filming agent, the Nantural non-toxic adhesive filming agent is used in particularly a kind of suitable tidal stencils casting, it is characterized in that prescription is (by weight, gross weight is 100%)

Starch 30-50%

Straw cellulose chip of stalk 15-25%

Filling, arbor broken last 10-20%

Sucrose dense dry residue 3-5%

Ferrous oxide powder 1-1.5%

Inorganic mineral powder 0-15%

The former powder water content of wherein each plant＜3%, mix the former powder of plant earlier in proportion granularity≤2 millimeter,, in proportion ferrous oxide powder and inorganic mineral powder is infiltrated then and mix after 100 mesh sieves through 120-160 ℃ of slakings, dehydration, pulverizing.

2, the Nantural non-toxic adhesive filming agent is used in tidal stencils casting according to claim 1, it is characterized in that described starch is fern root class, potato class or grain kind of starch; Described straw stalk cellulose is not the broken end of bagasse cellulose; Described filling, the broken end of arbor are the broken ends of canella branches and leaves.