CN102850000A - Board for packing case - Google Patents

Abstract

The invention belongs to the field of packaging materials and relates to a board for a packing case. The board for the packing case is characterized in that the board is prepared by using wheat straw particles as the raw materials, adding a certain amounts of polyvinyl alcohol adhesive and low alkalinity cement hardener and a right amount of water and processing the materials; and a composite reinforcement layer is laid on the surface of a slab. The board has the obvious advantages that agricultural waste straws are utilized; no formaldehyde is released; the flame retardance is good; the strength can meet the requirement; the cost is reduced; and the like. The board is a novel packaging material for saving energy, reducing the emission and developing the low carbon economy.

Description

A packing board

technical field

The invention belongs to the field of packaging materials, and relates to a packing box plate, in particular to a packing box board.

Background technique

With the development of industrial production and logistics industry, the demand for wood boards used in packing boxes is increasing day by day, while the resources of forest wood boards are becoming increasingly scarce.

In order to solve the problem of lack of forestry timber, artificial wood particle boards have come out one after another. Artificial wood particleboard mostly uses wood processing waste, such as shavings, sawdust, etc., but it needs to use a large amount of adhesives. Because the adhesives contain formaldehyde, they will cause serious damage and pollution to users, residents and the environment after release.

With the large-scale production of artificial wood particleboard, wood processing waste such as wood shavings is also becoming increasingly scarce, and the supply exceeds demand.

People began to use straw as raw material again, and urea-formaldehyde resin and isocyanate were used as adhesives to make artificial straw boards. The existing artificial straw board is not suitable for use as a board for packing boxes. What problems exist in the artificial straw board?

1. Urea-formaldehyde resin has poor adhesion to straw raw materials due to the high content of waxy substances and silicon dioxide on the surface, and releases formaldehyde, polluting the environment;

2. Isocyanate solves the adhesion problem, but the demoulding also causes serious mold sticking problems; isocyanate is expensive and costly, and the density of straw raw materials is small, only 1/4 to 1/5 of wood shavings , less sizing amount is difficult to distribute evenly;

3. Due to the poor initial viscosity of the isocyanate adhesive and the waxy surface of the straw raw materials, the initial strength of the artificial straw slab is poor, and because the packing box board is thin, it is easy to loose the slab and break the board during storage, transportation and use. Artificial straw boards are not suitable for packaging boards, and their promotion and application are subject to certain restrictions.

Contents of the invention

During the research process of packaging materials, the inventor found that the existing artificial straw boards had certain defects, and continued to explore and test repeatedly. Adhesion of straw raw materials, improving the strength of the board, and environmental pollution problems.

The technical solution adopted by the present invention is, a board for packing boxes, made of the following raw materials in parts by weight: 10-30 parts by weight of wheat straw, 1-5 parts of polyvinyl alcohol adhesive, 30-30 parts by weight of low-alkalinity cement curing agent 70, appropriate amount of water.

A composite reinforcement layer is applied on the surface of the packing box board made of the above raw materials.

The present invention adopts the above technical schemes and measures, and the wheat straw or rice straw scraps used are mechanically milled to reduce the wax on the surface, making them easy to bond; the adhesives such as polyvinyl alcohol are used, which not only avoid Formaldehyde-containing adhesives were developed to solve the problems of adhesiveness and mold sticking, and the price is low, which is convenient for controlling the amount of glue; the low-alkalinity cement or gypsum powder curing agent used can promote and speed up the adhesion of the adhesive to the raw materials. Solidification improves the initial strength of the slab, and at the same time acts as a flame retardant, thereby better solving the adhesiveness of the straw and sticking to the mold, improving the strength of the board for the packaging box, reducing the cost and the impact on the product. Problems such as environmental pollution; the present invention adds a composite reinforcement layer on the surface of the board for packaging boxes, which further increases the strength of the board for packaging boxes, improves product quality and use effect, and can also be used as furniture boards, thereby improving waste disposal. The utilization and conversion degree of straw.

Detailed ways

A packing box board of the present invention is made of the following raw materials in parts by weight: 10-30 parts of wheat straw or rice straw scraps, 1-5 parts of polyvinyl alcohol or polyvinyl butyral or polyurethane or starch adhesive, and 1-5 parts by weight. Alkalinity cement or gypsum powder curing agent 30-70, appropriate amount of water.

Example 1 of a packing box board of the present invention is made of the following raw materials in parts by weight: wheat straw or rice straw scrap 10, polyvinyl alcohol or polyvinyl butyral or polyurethane or starch adhesive 1, low alkalinity Cement or gypsum powder curing agent 30, appropriate amount of water.

Example 2 of a board for a packing box of the present invention is made of the following raw materials in parts by weight: wheat straw or rice straw scraps 30, polyvinyl alcohol or polyvinyl butyral or polyurethane or starch adhesive 5, low alkalinity Cement or gypsum powder curing agent 70, appropriate amount of water.

Embodiment 3 of a packing box board of the present invention is made of the following raw materials in parts by weight: 20 pieces of wheat straw or rice straw, 3 polyvinyl alcohol or polyvinyl butyral or polyurethane or starch adhesive, and low alkalinity Cement or gypsum powder curing agent 50, appropriate amount of water.

Embodiment 4 of a board for a packaging box of the present invention, laying cloth or paper, fiber, film layer and coating a waterproof and wear-resistant paint layer on the surface of the board slab for a packaging box made in the above-mentioned embodiments 1-3 Composite reinforced layer of reinforced material.

Embodiments 1-3 of a board for a packing box of the present invention adopt the following production process: Wheat straw scraps—adding adhesive and mixing with water—adding curing agent and mixing—pour into a mold—press molding with a pressure above 5MPa—curing— Slab-trimming-finished product.

The board for packaging box in Example 4 of the present invention adopts the following manufacturing process: in the manufacturing process of the board for packaging box in Examples 1-3, or spread cloth or paper and fiber surface reinforcement materials in the mold before the raw materials are poured into the mold , or after forming a slab, add a cloth or paper or fiber reinforcement layer on the surface of the slab or finished board, and then apply a waterproof and wear-resistant paint layer on the above reinforcement layer to form a composite reinforcement layer.

The sample of the packing box plate made by the present invention is tested according to the method of GB/T11718-2009, the static bending strength is ≥ 14.5MPa, the plane tensile strength is ≥ 0.45MPa, the water absorption thickness expansion rate is ≤ 2.0%, and the formaldehyde emission has not been tested. It is shown that the relevant indicators have reached or exceeded the performance of the national standard.

The present invention utilizes a large amount of agricultural waste straws to produce zero-formaldehyde-emitting ecological and environmental protection composite floor tiles, which turns waste into treasure, does not need to consume too much energy, and can be developed sustainably. Once the board is popularized and applied, it will definitely exert obvious advantages and produce significant social and economic benefits.

Claims (5)

1. tr plate is characterized in that adopting following weight part raw material to make: Wheat Straw particle 10-30, and poly (vinyl alcohol) binder 1-5, low alkalinity cement solidifying agent 30-70, water is an amount of.

2. tr plate as claimed in claim 1 is characterized in that adopting following weight part raw material: Wheat Straw or straw stalk particle 10, and polyvinyl alcohol or polyvinyl alcohol butyraldehyde or urethane or Starch Adhesive 1, low alkalinity cement or terra alba solidifying agent 30, water is an amount of.

3. tr plate as claimed in claim 1 is characterized in that adopting following weight part raw material: Wheat Straw or straw stalk particle 30, and polyvinyl alcohol or polyvinyl alcohol butyraldehyde or urethane or Starch Adhesive 5, low alkalinity cement or terra alba solidifying agent 70, water is an amount of.

4. tr plate as claimed in claim 1 is characterized in that adopting following weight part raw material: Wheat Straw or straw stalk particle 20, and polyvinyl alcohol or polyvinyl alcohol butyraldehyde or urethane or Starch Adhesive 3, low alkalinity cement or terra alba solidifying agent 50, water is an amount of.

5. the tr plate of making as claimed in claim 1 or 2 or 3 or 4 is characterized in that applying with the surface of plate at tr and is added with the composite strengthening layer.