The preparation method of polyurethane decoration concrete lining mould
Technical field
The present invention relates to a kind of preparation method of ornamental concrete mold.
Background technology
Ornamental concrete is to build out concrete wall or other concrete productss that structure with certain color, texture, line style or floriation combines with facing by moulding mould or lining mould.The lining mould can be divided into hard material and soft material two classes.Plank, profiled sheet, glass fiber reinforced plastic and rigid plastics etc. that the material that the former uses always has wood grain to protrude.The latter also claims Elastic forming board, and material commonly used has rubber, flexible plastic etc.
Tradition hard lining mould such as profiled sheet, grain pattern dullness, texture are not strong, owing to there is not elasticity, when the moulding striped, can't take less short demoulding tapering, can only pour into a mould the concrete products of simple grain pattern, can't satisfy the various day by day complicated pattern designing requirement of designer.
Soft lining mould of tradition such as rubber serve as a contrast mould, adopt high temperature curing process, and energy consumption is big, and cost increases, and very easily aged deterioration under high low temperature and Exposure to Sunlight environment is followed the string, and cause the grain pattern distortion, easily tear, and access times are low.For the soft lining mould of existing rubber, because the manufacturing of rubber mold former adopts steel to finish through machine usually, cost is very high, and for the relief pattern that specific (special) requirements such as surface imperfection are arranged, technical quality is difficult for reaching.In addition, rubber tear-proof, endurance, ageing-resistant performance are relatively poor, and be fragile when pouring, vibrated concrete and the demoulding, and it is low to reuse number of times.In addition, the Production Time of traditional soft lining mould, stretch-proof and tearing toughness were lower more than 24 hours, did not have the backing of reinforcement, and access times are less, can not realize the seamless cast of large format ornamental concrete.
Summary of the invention
The object of the invention provides a kind of preparation method of polyurethane decoration concrete lining mould, and the problem of duration is grown, delayed to the Production Time that solves traditional soft lining mould; Also solve the stretch-proof of traditional soft lining mould and the problem that tearing toughness is lower, access times are less.
Technical scheme of the present invention: this polyurethane decoration concrete lining mould, its front is scraggly decorative cover, and its back side is the plane, and compound overleaf stickup one deck glass alkali proof fiber grid cloth is strengthened backing.Mesh 0.2~the 0.8mm of above-mentioned glass alkali proof fiber grid cloth.
The preparation method of the described polyurethane decoration concrete lining mould of this claim 1 is characterized in that step is as follows:
Step 1: make silica gel mould earlier;
Step 2: in the die cavity of silica gel mould, spray release agent;
Step 3: will strengthen the die cavity bottom that backing is put into silica gel mould;
Step 4: the two component raw materials of A, the B of cast synthesis of polyurethane in the die cavity of silica gel mould, earlier B component and tertiary amine catalyst are annotated in container, after stirring, add the A component, can in the die cavity of silica gel mould, pour into a mould after continuing to stir, the temperature of raw material is 20~22 ℃, and the temperature of silica gel mould is 45~55 ℃;
Above-mentioned A component mainly is the liquid of polyalcohol and toluene diisocyanate;
Above-mentioned B component mainly is the liquid of polyalcohol, water absorbing agent and dyestuff;
Step 5: mold closing solidifies;
The demoulding after step 6:2-10 hour is strengthened backing and is utilized the adhesive paste of polyurethane at the polyurethane decoration concrete lining mould back side;
Step 7: deburring, arrangement, make polyurethane decoration concrete lining mould.
In step 1, the making step of silica gel mould is to make the former female parent earlier, in the former female parent, pour into a mould silica gel, add curing compound simultaneously, behind the allotment whipping process, produce silica gel mould, above-mentioned silica gel is white mobile liquid, and solidifying back hardness is the 22-50 degree, adds two Ye Gui a, famous physician of the Qing Dynasties acid dibutyl alkene curing compound by the 2-3% of silica gel weight.
In the above-mentioned allotment whipping process, with mixer sizing material is stirred, curing compound and silica gel were fully mixed 1-3 minute, mode with drip is poured in the charge door of former female parent, 30 minutes operating times, allow it trickle naturally and be covered with whole former female parent, along with the gas in the maternal die cavity of the trickling former of glue is progressively discharged by steam vent, when glue when steam vent overflows, can the steam vent of the glue that overflows with pottery mud stifled on, till the maternal die cavity of the full whole former of glue stream, glue tentatively solidified in about 1 hour, 2-4 hour hardening time, placed and got final product the demoulding in 8 hours, colloid solidifies fully needs 72 hours, can come into operation after solidifying fully.
The material of above-mentioned former female parent is timber, engineering plastics or resin, uses computer photograph software to carry out three-dimensional solid modeling, file is imported fast forming machine make the product prototype, handles the back as the former female parent.
The material of above-mentioned former female parent is timber, engineering plastics or resin, is formpiston with the material object, adds glue with gypsum and mixes, and inscription rubbing goes out gypsum former female parent.
In step 4, A component and B component proportioning by weight are: A component: B component=100:36~40.
The job practices of this polyurethane decoration concrete lining mould, it is characterized in that: above-mentioned polyurethane decoration lining mould and plywood form are used, hammer into plywood form with iron nail from polyurethane decoration lining mould front and fix, the template after the connection promptly with the supporting cast of carrying out ornamental concrete of corresponding mould bases system.
The job practices of this polyurethane decoration concrete lining mould, it is characterized in that: above-mentioned polyurethane decoration lining mould and plywood form are used, stick with glue that agent serves as a contrast mould with polyurethane decoration and plywood form is adhesively fixed, the template after the connection promptly with the supporting cast of carrying out ornamental concrete of corresponding mould bases system.
The present invention and conventional art relatively have following significant technique effect:
The present invention selects polyurethane to make the lining mold materials, because polyurethane has certain elasticity, can take less short demoulding tapering when moulding striped texture, makes design more flexible.The present invention itself has good texture, is easy to be processed into required grain pattern, and grain pattern is more rich and varied.The present invention is used for Dong Shi or ability variations in temperature when steam-cured; Alkali resistance is good, and physical dimension is stable, distortion is little.
The present invention is according to the requirement of ornamental concrete to the lining mould, design the optimum performance parameters of the molded work of lining, shortened the construction period greatly, and make polyurethane decoration lining mould flexible good, soft durometer is adjustable, wear-resisting, anti-solvent, low temperature resistant, ageing-resistant, characteristics such as inscription rubbing emulation is strong, not only grain pattern can reach designing requirement, and access times are many, anti-grain pattern distortion, tear-proof.The polyurethane decoration concrete lining mould soft durometer is moderate, intensity is high, abrasion resistance is good, pattern is clear, is rich in texture, and fancy is various true to nature, and manufacture craft is comparatively simple, cost of production is lower.
Raw material proportioning of the present invention and curing process have been simplified manufacture craft, have reduced manufacturing cost, have reduced energy consumption.
The present invention has increased the reinforcement backing and has posted technology, and polyurethane decoration lining mould intensity is strengthened greatly, significantly improves the stretch-proof and the tearing toughness of polyurethane decoration lining mould, and access times increase greatly, can realize the seamless cast of large format ornamental concrete.
The present invention adopts computer and two kinds of methods of sampling in kind to make the former female parent, can satisfy the requirement of various layouts to greatest extent.And based on the direct making former female parent of computer technology, the manufacturing time that makes mould shortens greatly and cost reduces greatly.
The present invention adopts the silica gel mold making technology, can pour into a mould molding to the grain pattern of various complicated shapes, and grain pattern is true to nature, has replaced complicated incised work.Make design more flexible, easy to be quick, cost of production is low.And the manufacturing of rubber mold former adopts steel to finish through machine usually, and cost is very high, and for the rubber mold former that specific (special) requirements is arranged, technical quality is difficult for reaching, and is especially to the mould of random texture, just difficult more.
The present invention is mainly used in occasions such as cast-in-place ornamental concrete body of wall, streetscape sculpture and prefabricated ornamental concrete, be specially adapted to prefabricated design body and surface complexity, cast-in-place concrete wall and concrete productss such as streetscape sculpture that has high relief and deep hole groove and prefabricated decorative sheet piece brick and tile that designs and varieties are more.
The outward appearance and the physicochemical property of polyurethane decoration lining mould of the present invention:
The outward appearance primary colors is a dark brown, can change color as required.The pattern three-dimensional is well arranged, any surface finish, pore-free, flawless, defectives such as no residue, no particle.Regular size (1200~2400) * (1200~600) * (10~30) mm.
Physicochemical property
Density (kg ∕ m
3)
|
700~900 |
Tensile strength (Mpa) |
2.5~4.0 |
Elongation at break (﹪) |
100~150 |
Tearing strength (N ∕ mm) |
8-15 |
Hardness (Shao A) |
50-80 |
Heat resistance ℃ |
80 |
Description of drawings
The structural representation of Fig. 1 polyurethane decoration lining mould.
The front view of Fig. 2 silica gel mould embodiment.
The lateral view of Fig. 3 silica gel mould embodiment.
The construction application schematic diagram of Fig. 4 polyurethane decoration lining mould on the wall mould.
The molded FB(flow block) of making technology of Fig. 5 polyurethane decoration lining.
1-silica gel; 2-silica gel mould frame; 3-polyurethane lining mould body; 4-strengthens backing; 5-polyurethane decoration lining mould; The 6-plywood form; The 7-back cord; The 8-diagonal brace.
The specific embodiment
Referring to Fig. 1, this polyurethane decoration concrete lining mould, its front is scraggly decorative cover, its back side is the plane, it is characterized in that: compound overleaf stickup one deck glass alkali proof fiber grid cloth is strengthened backing.Mesh 0.2~the 0.8mm of above-mentioned glass alkali proof fiber grid cloth.
The preparation method of the described polyurethane decoration concrete lining mould of this claim 1, its step are referring to Fig. 5:
Step 1: make silica gel mould earlier.
Embodiment one, serves as a contrast modeling method with the maternal polyurethane decoration of making of computer shaping female mold:
According to the drawing that the designer provides, softwares such as use Solid Edge carry out three-dimensional solid modeling, preserve with the stl file form; File is imported fast forming machine, make the product prototype, handle the back as the former female parent with engineering plastics.Maternal material can be used timber, engineering plastics, resin etc.
Selecting the silica gel of regulation model for use, is the 3%(weight ratio by proportioning) curing compound, with homogenizer sizing material is stirred, about 3 minutes, curing compound is fully mixed with silica gel, and under negative pressure row bubble 1-3 minute.
Shown in Fig. 3,4, the former female parent is placed silica gel mould frame 2, the mode of silica gel 1 usefulness drip is poured in the charge door of the high-order bit of model, till the full whole die cavity of glue stream.Place and got final product the demoulding in 8 hours.After 72 hours, can come into operation.
Embodiment two, are the maternal polyurethane decoration lining modeling method made from the material object:
Material object complete with surperficial grain pattern, no open defect is a formpiston, full size 1200 * 600 * 30mm, and the convex-concave degree of depth of hair side, lines or pattern is 10-20mm, in deckel, adds glue mixing inscription rubbing with gypsum and goes out gypsum former work female parent.
Selecting the silica gel of regulation model for use, is the 3%(weight ratio by proportioning) curing compound, with homogenizer sizing material is stirred, about 3 minutes, curing compound is fully mixed with silica gel, and under negative pressure row bubble 1-3 minute.
The former female parent is placed the silica gel mould frame, silica gel is poured in the charge door of the high-order bit of model, till the full whole die cavity of glue stream with the mode of drip.Place and got final product the demoulding in 8 hours.After 72 hours, can come into operation.
The silica gel mould manufacture craft:
Silica gel is flexible, has indeformablely, high temperature resistant, and acid and alkali-resistance does not expand, and can combine closely with maternal, is difficult for leakage, and the characteristics that the details replicability is good are poured into a mould molding to the grain pattern of different shape.
Select the silica gel of regulation model for use, be generally white mobile liquid, solidifying back hardness is 22-50 degree (deciding according to the size of mould and the complexity of grain pattern).Curing compound can be with two Ye Gui a, famous physician of the Qing Dynasties acid dibutyl alkene, and proportioning is the 2-3%(weight ratio), decide according to required demould time.
In allocation process, stir sizing material with homogenizer, curing compound is fully mixed with silica gel, general 1-3 minute.Silicon rubber promptly reacts under the room temperature with after curing compound mixes, and discharges low mass molecule alcohol, breaks away from colloid for making pure molecule, needs under negative pressure row's bubble 1-3 minute.
The mode of glue with drip is poured in the charge door of the high-order bit of model, 30 minutes operating times, allow it trickle naturally and be covered with whole model, along with the gas in the trickling die cavity of glue is progressively discharged by exhaust is empty, when glue when steam vent overflows, illustrate that this position glue has been full of die cavity, can block up the steam vent of the glue that overflows with pottery mud, till the full whole die cavity of glue stream, glue tentatively solidified in about 1 hour, 2-4 hour hardening time, place again and got final product the demoulding in 8 hours.Colloid solidifies fully needs 72 hours, just can come into operation.
Step 2: mold cleaning is clean, in the die cavity of silica gel mould, spray release agent.
Step 3: will strengthen backing and cover the polyurethane lining mould body back side, and strengthen backing and utilize the adhesive paste of polyurethane at the polyurethane lining mould body back side; The present invention has designed reinforcement backing structure especially at the lining mould back side, has strengthened the tensile resistence and the tearing toughness of lining mould, strengthens the material glass alkali proof fiber grid cloth of backing, mesh 0.2~0.8mm grammes per square metre 50~85g/m
2, color is close with the polyurethane color.Because the alkaline-resisting grid cloth intensity of glass fiber height, docile property are good, can effectively combine with polyurethane.Lining mould after pasting through the grid cloth back of the body strengthens greatly, make it concrete pouring, vibrate and knockout course in and not fragile in carrying, cutting process, improved the access times of lining mould.
Step 4: adopt two component normal temperature cast cured explosive moulding process.Raw material adopts polyurethane combined material.In container, it is promptly pourable after continuing to stir that the back that stirs adds the A component with B component and tertiary amine catalyst dimethyl cyclohexyl amine.Proportioning (weight ratio): A component: B component=100:36~40, temperature of charge is 20~22 ℃ during use, and mold temperature is 45~55 ℃.
The A component is that composition comprises polyalcohol, toluene diisocyanate etc.Outward appearance: black liquor, density 1.10 ± 0.05 g/cm
3.25 ℃, viscosity 600 ± 100 mpa.s/25 ℃ ,-NCO10 ± 0.3 ℅.
B component composition is mainly polyalcohol, water absorbing agent, dyestuff etc., outward appearance: dark-brown liquid, density 1.22 ± 0.05 g/cm
3.25 ℃, viscosity 150 ± 50 mpa.s/25 ℃ ,-NCO 28 ± 1 ℅.
Step 5: mold closing solidifies;
The demoulding after step 6:2-10 hour; Strengthening backing utilizes the adhesive paste of polyurethane at the polyurethane decoration lining mould back side.
Step 7: deburring, arrangement, make polyurethane decoration lining mould.
The job practices of polyurethane decoration concrete lining mould of the present invention is referring to Fig. 2, and a kind of is to hammer into fixing with iron nail from polyurethane decoration lining mould 5 fronts; Second kind is to stick with glue that agent serves as a contrast mould with polyurethane decoration and plywood form 6 is adhesively fixed.Be used in combination with plywood form, plywood form is the vegetarian noodles plate, and thickness is not less than 18mm, and the template after the connection is promptly assembled with mould bases system accessories such as back cord 7, diagonal braces 8 and carried out the concrete cast of decoration for vertical face.