CN100494606C - A kind of building template with oriented strand board as base material and its manufacturing method - Google Patents

Abstract

The invention discloses a building template with oriented flakeboard as substrate and the making method thereof, and it uses oriented flakeboard as substrate whose surface is pasted with single board; and can also paste dipped paper on the surface of the single board. And it uses the excellent physical mechanical property of the oriented flakeboard and also gives full play to the advantage of facing materials in strengthening anti-bending aspect, concrete adhesion proofing aspect and other aspects and solves utilization problem of small-diameter materials and saves large amounts of large-diameter timbers. And its manufacturing method is simple and easy to apply, and convenient to industrialized production.

Description

A kind of building template with oriented strand board as base material and its manufacturing method

technical field

The invention relates to a building template with an oriented structure particle board as a base material, and also relates to a manufacturing method of the building template.

Background technique

At present, the demand for building templates is showing an increasing trend day by day. In the past, multi-layer plywood, bamboo plywood and even solid wood or steel were commonly used to make building templates in my country. The use of solid wood and multi-layer plywood to make formwork consumes a large amount of large-diameter log resources every year; the use of bamboo plywood and steel to make formwork is expensive, difficult to popularize, and consumes serious resources.

Oriented strand board is a new type of structural material. In the 1990s, Nanjing Forestry University undertook the national "Eighth Five-Year Plan" scientific and technological research to realize the localization of complete sets of technology and equipment, promoted the construction of factories across the country, and applied for a patent for invention (patent number 95111192.2, named "Oriented Structure Particleboard Manufacturing Method "). Oriented strand board is made of small-diameter wood (including branch wood) and water-resistant synthetic resin as adhesive. It is manufactured through a series of processes and has excellent comprehensive properties: (1) Physical properties: moisture resistance, warping resistance, Anti-corrosion, anti-moth, heat insulation, sound insulation; (2) mechanical properties: compact structure, high strength-to-weight ratio, anisotropy; (3) environmental performance: low formaldehyde emission; (4) processing performance: easy sawing, Easy to nail, drill, plan, sand, paint and veneer. Therefore, oriented strand board has been used as a structural material and is widely used in construction occasions. Analyzing the actual application of building formwork, its performance requirements mainly include: (1) high plane bending resistance; (2) strong surface water resistance; (3) high surface anti-adhesion; (4) easy to saw , Nail processing. Since the constituent units of OSB are narrow and long shavings, which are 100-150mm long, 50-75mm wide, and 0.8-1.0mm thick, the surface of OSB is relatively rough, so it is not suitable for direct use as a formwork for concrete curing. Although the veneering of ordinary wood-based panels has long been known, there is no report on the application of the technology of using oriented strand board as the base material and improving its performance through composite veneer materials in the field of building formwork.

Contents of the invention

The object of the present invention is to provide a water-resistant, anti-adhesive, high-strength composite building formwork made of oriented strand board instead of multi-layer plywood as the base material and composite veneer material.

Another object of the present invention is to provide a method for manufacturing the above-mentioned building formwork.

The purpose of the present invention is achieved through the following technical measures:

The utility model relates to a building formwork with an oriented strand board as a base material. The building formwork uses an oriented strand board as a base plate, and a veneer is pasted on the surface of the base plate. According to the needs, only the veneer can be pasted, and the practice shows that the effect is acceptable; but if it is necessary to further improve the water resistance and the resistance to cement adhesion, the impregnated paper can also be pasted on the surface of the veneer.

The building formwork described above, wherein the oriented strand board refers to a structural board made of strip-shaped shavings and hot-pressed using phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, isocyanate or a modified resin of the above-mentioned synthetic resins as an adhesive. Long shavings can usually be selected to be 50-150mm long, 10-75mm wide, and 0.1-1.0mm thick.

The building formwork described above, wherein the veneer is a thin sheet of wood with a thickness of 0.2-3.0mm, preferably 0.8-2.0mm, which can be formed by rotary cutting, sawing or planing, and the tree species cover natural forests and artificial forests, and the format size According to the format size of OSB, splicing method can be used to produce the veneer with required format size.

The building formwork described above, wherein the grain direction of the veneer is perpendicular to or parallel to the pavement direction of the surface layer of the oriented strand board, the number of veneer layers is controlled at 1-2 layers, and when the number of veneer layers is 2 layers, the adjacent veneer layers maintain direction intersections.

Oriented strand board imitates plywood, and generally has a 3-layer structure. The paving direction of the upper and lower layers of shavings is parallel to the length direction of the board, and the paving direction of the middle layer of shavings is vertical, so that the board is not easy to deform. Since the shavings used in oriented strand board are strip-shaped shavings, the so-called surface paving direction is the direction parallel to the long side of the long strip-shaped shavings in the surface structure. In addition, since the veneer also has a texture direction (that is, the cell arrangement direction or the tree growth direction), when veneering, there is a problem that the veneer texture direction is consistent with or perpendicular to the surface pavement direction of the oriented structural board. The direction crossing between adjacent layers can enhance the flexural performance of the plate.

In the construction formwork described above, the adhesive used for covering the veneer with the oriented strand board is a thermosetting resin. Commonly used thermosetting resins are phenolic resins, urea-formaldehyde resins or melamine-formaldehyde resins. These resins are water-resistant synthetic resin adhesives.

The building formwork described above, wherein the impregnated paper is formed by treating the veneer base paper by synthetic resin impregnation, brush coating or roller coating or a combination of these methods, and then drying and shaping. The base paper of the veneer panel requires a basis weight of 70g/ ^m2 or more, and the effect is better. The synthetic resins used include thermosetting resins such as phenolic resins, urea-formaldehyde resins, melamine-formaldehyde resins, dipropylene phthalate resins, and modified resins of these resins. The amount of synthetic resin used in the impregnated paper is 10-200% of the absolute dry mass of the veneer base paper.

The manufacturing method of the described building formwork comprises the following steps when only veneer is pasted on the surface of the oriented strand board:

(1) Carry out surface thickness sanding treatment to oriented strand board;

(2) Water-resistant synthetic resin adhesive is used to cover wood veneers of appropriate thickness;

(3) Hot pressing to form the required building formwork.

The manufacturing method of the described building formwork comprises the following steps when pasting veneer and impregnated paper on the surface of the oriented strand board:

(1) Carry out surface thickness sanding treatment to oriented strand board;

(2) Water-resistant synthetic resin adhesive is used to cover wood veneers of appropriate thickness;

(3) Fine sand or non-fine sand on the surface of the veneer;

(4) Paste synthetic resin impregnated paper on the surface of the veneer;

(5) Hot pressing to form the required building formwork.

The thickness of the selected OSB and veneer can be adjusted according to the thickness requirements of the construction formwork, the degree of fine sand on the surface of the veneer can be adjusted according to the requirements of the construction site for the surface finish of the formwork, and the amount of synthetic resin impregnated paper can be adjusted according to the construction site Adjust the water resistance requirements of the template, and the commonly used range is 10-200% of the absolute dry mass of the base paper.

The water-resistant synthetic resin adhesive is phenolic resin, urea-formaldehyde resin or melamine-formaldehyde resin.

The width of the building formwork can be adjusted according to the needs, generally 1220mm×2440mm; the thickness can also be adjusted according to the needs. The finished thickness of the building formwork is generally divided into four standards: 12mm, 15mm, 18mm, and 21mm. Due to veneer and impregnated paper, the thickness of OSB substrate needs to be adjusted accordingly. For example, to manufacture a template with a thickness of 15mm and stick a veneer of 1.7mm on both sides, if the oriented strand board with a thickness of 15mm is directly used, the thickness of the manufactured template must exceed 15mm. At the same time, the compression rate of the veneer is controlled during hot pressing, so that the thickness of the final template can be close to 15mm.

Beneficial effects of the present invention:

Lamination processing on the surface of oriented strand board can not only take advantage of the excellent physical and mechanical properties of oriented strand board itself, but also give full play to the enhanced advantages of veneer materials (veneer, impregnated paper) in terms of bending resistance and concrete adhesion resistance ( See the embodiment effect data for details), solve the utilization of small-diameter timber and save a large amount of large-diameter grade timber simultaneously, have realized " small timber big use, inferior timber optimal use ". The manufacturing method of the building formwork is simple and easy to implement, and is convenient for industrialized production.

Detailed ways

The present invention will be further described below by way of examples, but the present invention is not limited.

General Notes:

The synthetic resin adhesive used in the examples can be purchased from the market, and the performance of the specific type of resin can be found in the manufacturer's product specification.

The impregnated paper is prepared by treating the veneer base paper by synthetic resin impregnation, brush coating or roller coating or a combination of these methods, and then drying and shaping. The base paper of the veneer is required to be more than 70g/ ^m2 , and the amount of synthetic resin is 10-200% of the absolute dry mass of the base paper of the veneer.

The methods for testing the performance of the templates made in the examples are all tested according to GB/T 17657-1999 "Testing methods for physical and chemical properties of wood-based panels and facing wood-based panels".

Example 1: Poplar thick veneer veneer without impregnated paper

Oriented strand board with a thickness of 11mm and a density of 0.65g/cm ³ is used as the substrate, and the thickness of the substrate is sanded to 10.5mm, and a phenolic resin adhesive with a solid content of 37.5% is used, and the sizing amount is 110g/m ² , double-sided Paste poplar veneer with a thickness of 1.7mm, the grain direction of the veneer is parallel to the pavement direction of the surface layer of oriented strand board, and it is pasted by hot pressing method. The hot-pressing conditions are: hot-pressing temperature: 125° C.; hot-pressing pressure: 0.9 MPa; hot-pressing time: 3 min. The thickness of the template made is 12.4mm (reaching the tolerance requirement of ±0.5mm), the water absorption thickness expansion rate is reduced from 22% of the original oriented strand board to 10.75%, the bending strength is as high as 37.5MPa, and the elastic modulus is 6286.32MPa.

Example 2: Poplar thick veneer veneer, pasted with phenolic resin impregnated paper

Oriented strand board with a thickness of 11mm and a density of 0.65g/cm ³ is used as the substrate, and the thickness of the substrate is sanded to 10.5mm, and a phenolic resin adhesive with a solid content of 37.5% is used, and the glue amount is 110g/m ² , double-sided Paste poplar veneer with a thickness of 1.7mm, the grain direction of the veneer is parallel to the pavement direction of the surface layer of oriented strand board, and then paste phenolic resin impregnated paper on both sides (the preparation method of impregnated paper is the combination of phenolic resin impregnated and roller coating. The base paper for the veneer is formed by drying and shaping. The basis weight of the base paper for the veneer is 80g/m ² , and the amount of phenolic resin is 100% of the dry mass of the base paper for the veneer). The hot-pressing conditions are: hot-pressing temperature: 135° C.; hot-pressing pressure: 1.1 MPa; hot-pressing time: 5 min. The thickness of the template made is 12.49mm (tolerance requirement of ±0.5mm), the water absorption thickness expansion rate is reduced from 22% of the original oriented strand board to 8.76%, the bending strength is as high as 54.11MPa, and the elastic modulus is 6551.51MPa.

Example 3: poplar veneer veneer, paste phenolic resin modified resin impregnated paper

Oriented strand board with a thickness of 12mm and a density of 0.65g/cm ³ is used as the substrate, and the thickness of the substrate is sanded to 11.0mm, and a phenolic resin adhesive with a solid content of 37.5% is used, and the sizing amount is 60g/m ² , double-sided Paste poplar veneer with a thickness of 0.8mm, the grain direction of the veneer is parallel to the pavement direction of the surface layer of oriented strand board, and then paste phenolic resin modified resin impregnated paper on both sides (preparation of impregnated paper: phenolic resin is modified with urea-formaldehyde resin (urea-formaldehyde resin The ratio of the base paper to the phenolic resin is 7:3), impregnating and rolling the base paper of ^the decorative panel, and then drying and shaping. Pressure method overlay. The hot-pressing conditions are: hot-pressing temperature: 130° C.; hot-pressing pressure: 1.1 MPa; hot-pressing time: 3 min. The thickness of the template made is 11.67mm (tolerance requirement of ±0.5mm), the water absorption thickness expansion rate is reduced from 22% of the original oriented strand board to 11.48%, the bending strength is as high as 28.94MPa, and the elastic modulus is 3723.36MPa.

Example 4: Masson pine thin veneer veneer, pasted with phenolic resin impregnated paper

Oriented strand board with a thickness of 12mm and a density of 0.65g/cm3 is used as the substrate, and the thickness of the substrate is sanded to 10.5mm, and a phenolic resin adhesive with a solid content of 37.5% is used, and the glue amount is 80g/m ² . Masson pine veneer with a thickness of 0.8mm, the grain direction of the veneer is perpendicular to the pavement direction of the surface layer of the oriented strand board, and then pasted with phenolic resin impregnated paper on both sides (the impregnated paper is prepared by treating the veneer base paper with phenolic resin impregnation, and then drying Shaping and forming. The weight of the base paper for the veneer is 80g/m ² , and the amount of phenolic resin is 50% of the absolute dry mass of the base paper for the veneer), and it is pasted by hot pressing. The hot-pressing conditions are: hot-pressing temperature: 125° C.; hot-pressing pressure: 1.0 MPa; hot-pressing time: 4 min. The thickness of the template made is 12.08mm (tolerance requirement of ±0.5mm), the water absorption thickness expansion rate is reduced from 22% of the original oriented strand board to 11.14%, the bending strength is as high as 31.16MPa, and the elastic modulus is 3867.80MPa.

Claims (11)

1, a kind of is the construction formwork of base material with the oriented structure chipboard, it is characterized in that the oriented structure chipboard after this construction formwork is with sanding is a substrate, and substrate surface posts veneer, and impregnated paper is pasted on the veneer surface again;

Wherein: veneer grain direction and the top layer of the oriented structure chipboard direction of mating formation is perpendicular or parallel when pasting veneer, and the ply numerical control is built in 1～2 layer, and when the veneer number of plies is 2 layers maintenance direction intersection between the adjacent ply.

2, construction formwork according to claim 1, it is characterized in that described oriented structure chipboard refers to adopt the strip wood shavings, use the modified resin of phenolic resins, Lauxite, melamine resin, isocyanates or these synthetic resin to be bonding adhesive, the structural type sheet material that hot pressing forms.

3, construction formwork according to claim 1 is characterized in that described veneer is a ply.

4, construction formwork according to claim 3 is characterized in that described ply thickness is between 0.2～3.0mm.

5, construction formwork according to claim 1 is characterized in that it is thermosetting resin that veneer posts the used bonding adhesive of oriented structure chipboard.

6, construction formwork according to claim 5 is characterized in that thermosetting resin is phenolic resins, Lauxite or melamine resin.

7, construction formwork according to claim 1 is characterized in that impregnated paper system adopts synthetic resin dipping, brushing or the method for roller coat or the mode that these methods mutually combine to handle facing plate body paper, and dryness finalization forms again.

8, construction formwork according to claim 7 is characterized in that described synthetic resin is thermosetting resin, comprises phenolic resins, Lauxite, melamine resin, diallyl phthalate resin or their modified resin.

9, construction formwork according to claim 8 is characterized in that the synthetic resin consumption that impregnated paper adopts is 10～200% of a facing plate body paper over dry quality.

10, the manufacture method of the described construction formwork of claim 1 is characterized in that comprising the following steps:

(1) oriented structure chipboard being carried out the fixed thick sanding in surface handles;

(2) adopt the water resistance adhesive made of synthetic resin, post the wood single-plate of suitable thickness;

(3) washed ore or washed ore are not carried out in the veneer surface;

(4) at veneer surface applying resin impregnated paper;

(5) hot pressing forms required construction formwork.

11, the manufacture method of construction formwork according to claim 10 is characterized in that the water resistance adhesive made of synthetic resin is phenolic resins, Lauxite or melamine resin.