Summary of the invention
In order to reduce the facility investment of producing composite wall body material, reduce the amount of expending of wood (paper) fiber, the present invention designs a kind of magnesia and paper fibre composite wall material and production method thereof, greatly reduce the facility investment expense and reduced wood (paper) fiber consumption, shorten the production cycle, and the product porous of making, waterproof, fire prevention, mildew-resistant, mothproof also have sound isolating and heat insulating performance.
The technical scheme that the present invention solves the problems of the technologies described above is: formed by following raw materials according and weight part proportioning thereof: 90 parts of magnesias, 30-100 part water, 5-20 part are done in the silane coupling agent, polyacrylate dispersion, polyvinyl acetate emulsion of toughener at least a as magnesium chloride, 1-5 part paper fiber, 1-10 part of activator.
Optimum weight part proportioning of each raw material is: 90 parts of magnesias, 40-60 part water, 10 parts of magnesium chlorides, 2 parts of paper fibers, 5-6 part toughener.
Said toughener is at least a in silane coupling agent, polyacrylate dispersion, the polyvinyl acetate emulsion, and preferred plan is silane coupling agent and polyvinyl acetate emulsion mixed solution.
This magnesia is to follow these steps to carry out with paper fibre composite wall material produce method:
(1) pre-treatment of raw material is with magnesia drying, pulverizing, screening, and waste paper is cut into slice, pulverizing, homogenate, system MgCl
2The aqueous solution is standby;
(2) weighing of raw material and mix well pulping;
(3) go into mold forming;
(4) heating cure;
(5) demoulding drying;
(6) saw cuts and test.
The invention has the beneficial effects as follows: the wood that expends (waste paper) fiber is few, and is a kind of utilization of waste material, greatly saves day wood raw material of sense shortage; Need not acquire press, low equipment investment; Save preserving period, shortened the production cycle.
Embodiment
The present invention will now be further detailed embodiment: earlier each production stage is done careful introduction.
(1) pre-treatment of raw material.Selecting Mg0 content is the magnesia of 75-85%, is dried, pulverizes, screens, and makes raw material with 50 order to 300 purposes; Waste paper is cut into 5 * 30mm slice earlier, makes paper pulp again in pulverizing, refiner; Make content and be about 30% MgCl
2The aqueous solution is standby.
(2) weighing of raw material and mix well pulping.Weight part ratio requirement by each raw material that designs takes by weighing, and mixes well pulping again.
(3) go into mold forming.Be the cost-saving, by the prefabricated wooden model of design specification, the slurry that falls is gone into mold forming, and swing die when going into mould enriches filling.
(4) heating cure.Solidify 0.5-2.0h under 80 ° of-160 ℃ of conditions, it is fixed that come by temperature, material shape, thickness set time.
(5) demoulding drying.Be cooled to below 40 ℃, non-scald on hand is the film mould, owes exsiccant heat drying or seasoning again.
(6) saw cuts and test.Cut or only make the deburring saw and cut by user's dimensional requirement saw, by tests of testing such as the standard-required of product and relevant mechanical properties.
Embodiment:
Select MgO content be 80%, granularity is 150 purpose magnesia 90kg, water 40kg, MgCl
2Content accounts for 30% aqueous solution 10kg, the paper pulp of paper fiber 2kg furnishing, polyvinyl acetate emulsion 5kg, 0.08kg (80g) silane coupling agent sneak into and fully mix thoroughly in the cement mixer after, pour into one by one in the mould that is placed on the vibrator, after its filling is enriched, moving to drying room, is thin material the floor tile as what make, then solidifies 2 hours in 80 ℃, or in 160 ℃, solidify 0.5h, to be cooled to 40 ℃ with bottom knockout, reached dry requirement basically, can saw immediately and cut or the deburring test.If make brick shape material, then can in 160 ℃, solidify 0.5h after, stack nature again and dry.Low as surface finish is required, just jagsaw does not cut or the deburring usefulness of building a wall.
Below with the add-on of some raw materials to the expression of tabulating of the laboratory simultaneous test of the performance impact of composite wall body material.
Amount of water is to performance impact (table 1)
Sequence number |
Amount of water (ml) |
Density (g/cm
3)
|
Internal bond strength (Mpa) |
The ratio of strength to weight |
1 |
40 |
1.294 |
0.588 |
0.454 |
2 |
60 |
1.278 |
0.412 |
0.322 |
3 |
80 |
1.340 |
0.393 |
0.293 |
4 |
100 |
1.263 |
0.396 |
0.313 |
Table 1 shows that amount of water is big to internal bond strength, ratio of strength to weight influence, and amount of water and internal bond strength are inversely proportional to, and be preferred with 40-60ml.
During 180 ℃ of solidification values, the easy charing of paper fiber, plasticity descends, and produces cracking phenomena, so solidification value is the highest exceeds with 160 ℃, be controlled at 80-160 ℃ more suitable.
Add paper pulp amount to performance impact (table 2)
Sequence number |
Paper fiber (g) |
Density (g/cm
3)
|
Internal bond strength (Mpa) |
The ratio of strength to weight |
1 |
0 |
1.304 |
0.287 |
0.220 |
2 |
2 |
1.294 |
0.588 |
0.454 |
3 |
3 |
1.201 |
0.396 |
0.330 |
4 |
4 |
1.042 |
0.227 |
0.218 |
5 |
5 |
0.897 |
0.126 |
0.140 |
The paper pulp add-on showed that the adding of paper delivery fiber is all big to three performance impacts, to add the preferred of 2-3g to the performance impact table when table 2 was 160 ℃ of amount of water 40ml, solidification value.
Also to adding which kind of toughener, single thing toughener still is the mixture toughener to the applicant, compares test, with 5 parts of polyvinyl acetate emulsions with to make the toughener effect less than 1 part silane coupling agent best.Because of length is limit not carefully row.Listed " ratio of strength to weight " in the table is meant the material of same weight and the ratio of intensity, i.e. internal bond strength/weight.
In the raw material of the present invention, magnesia is to form with the magnesite calcining, be powdery air-setting consolidating material, main component is a magnesium oxide, have fast solidifying, intensity height, alkalescence weak, easily combine with organism, performances such as fire prevention, waterproof, be benchmark with the magnesia of fixing 90 weight parts among the present invention, calculate other proportion of raw materials amount, calculate oppositely that certainly proportional quantity also is feasible.
Whether the adding of paper pulp to be, adds or adds fewly, with the performance of composite wall body material remarkably influenced is arranged, and it plays tractive therein, improves the flexible effect, do not add with to add paper pulp all not all right, and be that 2 weight parts are best to be converted to the paper fiber.The paper fiber is interspersed, overlapping in magnesia, adhesion becomes a three-dimensional reticulated structure, has improved the performance that absorbs and disperse impact energy, makes composite wall body material resistance to impact shock and good toughness.
Add this polyphosphazene polymer of polyvinyl acetate emulsion and contain thing, in solidification process, it can produce superpolymer and coat Mg (OH) around complex compound
2Xln forms the excellent waterproof protective layer, and is also crosslinked voluntarily and stop up capillary channel in the space between crystal simultaneously, reduces chlorion and contact with water molecules, the stability of raising complex structure in water.Silane coupling agent contains long key section, can form the loose interfacial layer of flexibility stress, improve the shock strength and the toughness of materials for wall, and this coupling agent can change over covalent bonding with the bonding of material, increased the avidity of magnesia and paper fiber, play the molecule bridge, not only gain in strength, also can increase the add-on of magnesia, reduce paper fiber amount of expending and production cost.
As magnesia, paper pulp, water, MgCl
2, behind the polyvinyl acetate emulsion, silane coupling agent homogenate, bond is closed the formation spatial grid structure, the water molecules in its structure is through heating cure, the dehydration evaporation just forms micropore shape composite wall body material.