JPS6028588A - Asphalt roofing - Google Patents

Abstract

PURPOSE:To provide the titled thin and durable roofing having excellent water- proofing property, by hot-pressing a paper made of a synthetic polyethylene pulp, vegetable fiber and glass fiber, and applying asphalt to one surface of the obtained water-impermeable core sheet. CONSTITUTION:A sheet of paper composed mainly of 40-60(wt)% synthetic polyethylene pulp and 5-20% vegetable fiber (e.g. pulp, wastepaper, etc.) and glass fiber, is hot-pressed at a temperature above the melting point of the synthetic pulp (i.e. 90-140 deg.C) to obtain a core sheet having a water-impermeable layer composed of the fibers bonded and integrated together by the molten and pressed synthetic pulp. Asphalt is applied to at least one surface of the core sheet to obtain an asphalt roofing having light weight and high water-proofing property.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to asphalt and roofing which are suitable mainly for asphalt waterproofing work on the roofs of buildings and the like. Specifically, the asphalt and roofing are characterized by using a water-impermeable core sheet in which polyethylene synthetic pulp is blended to form a polyethylene melt layer.

The purpose of this is to use a water-impermeable sheet as the core material sheet for asphalt and roofing to prevent water from entering the asphalt waterproof layer, thereby preventing aging and improving durability, and making the waterproof layer lighter in weight. It is measured by

Conventionally, as core materials for asphalt and roofing, pulp, waste paper, rag fiber, synthetic fiber, base paper of inorganic fiber, or nonwoven fabric is used. Even if the Kameru sheet is impregnated with asphalt, its water absorption rate is over 20%, and its water permeability is also very high. Even if coating asphalt is applied to both sides of the asphalt-impregnated sheet, the coating asphalt itself has some water permeability, and the use of a long blade will prevent the surface from cracking or aging, resulting in increased water permeability. When moisture enters the asphalt waterproof layer, it accelerates aging to the inside, deteriorating the strength, extensibility, and elasticity of the asphalt waterproof layer, resulting in a loss of durability.
Well known in the industry.

The hydraulic conductivity of blown asphalt for imitation is 9X10 f
Although it is about irm/cm ttm Hg hr, the water resistance of the waterproof layer has a large influence.

On the other hand, the asphalt waterproof layer is made by alternately laminating asphalt and roofing, and usually uses 3 to 5 roofing layers to reduce aging caused by water permeation and improve durability.

However, since the core materials of asphalt and roofing have water permeability, aging of the inside of the waterproof layer due to infiltrated moisture is inevitable, which impairs durability. Also, like this, the product FQff
As a result of using i as *< shi, its weight increases significantly, and there is a current demand for a lighter waterproof layer in modern architecture.

For this reason, roofing has been proposed in which a plastic sheet or aluminum foil sheet is used as a non-water-permeable core material and asphalt is coated, but these have poor adhesion to asphalt and cause problems such as Karama-hibina or peeling of the applied asphalt. could not be used due to its shortcomings.

In view of the current situation, the present invention has improved all the conventional drawbacks, and by using a special core material sheet that is not water permeable and has excellent adhesion to asphalt, the thickness of the roofing body can be reduced. The asphalt layer can be formed into a thin tank, and even if multiple layers are used for waterproofing construction on rooftops, floors, etc., the asphalt layer sandwiched in between will reliably block water intrusion and prevent aging. The overall thickness of the waterproof construction layer can be reduced, the weight of the waterproof layer can be reduced, and a waterproof layer with reliable durability can be obtained.

That is, the present invention uses a sheet made of paper made mainly of polyethylene synthetic pulp 40 to 60 heirlooms, vegetable fibers, Wu fibers, and glass 11A fibers as a core material, and a sheet obtained by heat-pressing processing, and at least one of the core sheets. In the present invention, polyethylene synthetic pulp refers to asphalt or roofing made by applying asphalt to the surface of
(manufactured in the United States) and Torol (manufactured in the United States), which are pulp-like, multi-branched, low point polyethylene fibers.

It has an average fiber length of 0.6 to 1.6 fibers, a specific gravity of 0.95, and is well dispersed in water, making it suitable for mixed papermaking with pulp. Melting point is 9
When hot-pressing is carried out at a temperature of 0° C. to 140° C. and above the melting point, water-impermeable 1 is formed and the stretchability of the sheet is improved.

However, polyethylene synthetic pulp can be bonded with other fibers75
In order to integrate it into an impermeable layer, 40 to 6 g of nails (
It is necessary to use it by blending it in an amount of 1%.

If it is less than 4o (q), it will not be possible to form a sufficient water-impermeable layer, and if it is mixed more than 60% by weight, the amount of vegetable fibers and glass fibers will decrease, and as will be described later, IC1 dimensional stability, toughness, and cyclic resistance will be improved. Since the loadability deteriorates, it is necessary to select from the above range.

The glass fibers serve to improve the dimensional properties of the roofing, that is, to prevent it from elongating and shrinking due to cold, rust, and aging, and to increase its strength. In addition, the high-temperature rigidity is increased to strengthen the stiffness during lamination work using heated asphalt, making it less likely to wrinkle and making construction easier.

For this purpose, the content of the core sheet must be 5 to 20
The person in charge is the best.

The vegetable fibers used include pulp, waste paper, rag fiber, and cotton, which are the main raw materials for core sheets used in conventional asphalt and roofing, and have good impregnability with waterproofing agents and are resistant to ξd. Loadability 1i11 It has the ability to break against repeated stresses such as tension, compression, and bending due to vibrations of buildings or shaking vibrations.

In addition, heat-pressing processing usually refers to polyethylene synthetic pulp having a melting point of 90 to 6140°C, so it is passed through a roll, cylinder, or dryer heated above the melting point, pressurized, and rolled to form a water-impermeable polyethylene layer. It causes the formation of

It is important that this processing melt-rolls the polyethylene synthetic [ζrug] to form an impermeable layer in which the fibers are bound and integrated.

In addition, when making the core material sheet using a paper machine,
To stabilize the formation and transfer of wet paper, it is advantageous to add P, V, A fibrous binders, and other water-soluble polymeric binders can also be used.

The core material sheet of the present invention constructed in this way has excellent water impermeability, so that by simply applying a thin layer of asphalt to both or one side of the core sheet, lightweight and highly waterproof asphalt or roofing can be made. I can do it.

Moreover, since the core material sheet has a shape in which each m fiber is exposed on the surface, the coated asphalt adheres well, and unlike conventional metal foil or plastic sheets, it does not cause peeling of the asphalt or delamination between the layers. A highly durable product can be obtained.

Therefore, when the asphalt and roofing of the present invention are used to form an asphalt waterproof layer on the roof of a building, the following effects are achieved.

■ In the asphalt layer, multiple roofing layers, and laminated waterproof layer, the core material sheet is impermeable to water, so the asphalt in the middle between the roofing layers does not allow moisture to enter, preventing aging. It is durable and can provide excellent waterproof function over a long period of time.

■ Since the core material sheet is water-impermeable, the covering asphalt can perform a sufficient waterproof function even if it is thin, so it can be made lightweight. Because it is lightweight, it is extremely advantageous in terms of handling, transportation, and construction work in high places such as the roof of a building.

■ By reducing the number and amount of laminated asphalt layers and roofing layers, a lightweight waterproof layer can sufficiently perform the waterproofing function, and the recent demand for lightweight architectural trench construction can be fully met. The present invention will be further clarified by showing typical examples and comparative examples below.

According to the composition of the core material sheet shown in Example Table 1, polyethylene synthetic pulp and wood pulp are sufficiently beaten and dispersed in water at 50 to 60°C, and then glass fiber and PVA fibrous binder are added and mixed. A wet paper layer is formed on the screen using a mesh paper machine, dehydrated by suction, and dried using a 100℃ dryer.
A core sheet was obtained by pressing and rolling in a 130° C. calender.

Next, coating asphalt was applied to both sides of this core sheet using an asphalt and roofing manufacturing machine.

Got roofing. The results of the property tests shown in Table-2,
Compared to the conventional product (comparative example), one roll (21 m) of Mffi was lighter, and even though the amount of covered asphalt was small, asphalt and roofing with low water absorption and water permeability were obtained. .

Comparison example (conventional product) By impregnating and applying asphalt to the roofing base paper manufactured by the conventional method using the core material sheet composition shown in Table 1, the product passes the 35~ grade specified in JIS A 6006. Got asphalt and roofing.

The property test results are shown in Table-2.

Table -] Asphalt and roofing core material sheet composition table - 2 Asphalt and roofing property test documents Notes - Tensile strength is based on JIS A 6006 test method - Water absorption rate is 24 hours in 25℃ water, water absorption rate after immersion - The water permeability is
Water permeability through a water bottle with a water level of 25 crn for one week at 25°C Patent applicant: Nissin Kogyo Co., Ltd. Agent Patent attorney: Yoshio Dokimura

Claims (1)

[Scope of Claims] 1. A core material is a sheet obtained by heat-pressing a paper made of 40 to 60% by weight of polyethylene synthetic pulp, vegetable fibers and glass fibers as main raw materials, and at least one of the core material sheets is Asphalt and roofing are made by applying asphalt to the surface. 2. The asphalt or roofing according to claim 1, wherein the core sheet contains 5 to 20 parts by weight of glass fiber. & The asphalt or roofing according to claim 1, wherein the core material sheet is formed by melting and rolling polyethylene synthetic pulp through heat-pressing processing to form an impermeable layer in which fibers are bound and integrated.