CN105060805A - Plant fiber cement composite ribbon board with excellent water resistance and manufacturing method thereof - Google Patents

Abstract

The invention discloses a plant fiber cement composite ribbon board with excellent water resistance. According to the invention, a polyurethane resin dipping treatment process is employed to pretreat the surfaces of plant fiber so as to allow the internal and external surfaces of the plant fiber to be coated with a polymer film, then mist-like turpentine is sprinkled, so the entire fiber is compact, obtains certain rigidity and has improved water resistance; and then fly ash is added to modify and replace a part of cement, so the generation amount of hydrated calcium hydrate is decreased, and corrosion resistance of the plant fiber is improved. The prepared plant fiber cement composite ribbon board has the characteristics of light weight, high strength, antibacterial performance, mildew resistance, heat preserving performance, thermal insulation performance, low carbon, environment friendliness.

Description

Plant fiber-cement composite strip plate that a kind of water resistance is excellent and preparation method thereof

Technical field

The present invention relates to material of construction material technical field, be specifically related to excellent plant fiber-cement composite strip plate of a kind of water resistance and preparation method thereof.

Background technology

Since entering the nineties, in the selection of living environment, people have been not content with general has it to occupy, but is pursuing material of construction and the new building materials of environmental harmony type with natural characteristic.Environmental harmony type building materials must meet heat preservation energy-saving, sound absorption sound insulation, water-proof fire-retardant, nonpoisonous and tasteless, lightweight, the characteristic such as high-strength, safe, plant fiber-cement composite strip plate is exactly a kind of novel environmental harmony type material of construction, selected vegetable fibre refers to annual fiber, mainly refers to that crop stalk is as corn stalk, straw, cotton stem, waste of flax etc.

At China's yearly plant abundance, be inexhaustible, nexhaustible raw material, their lifetime is shorter, does not have too large purposes after withered.These crop stalks through cut off hammer broken after obtained vegetable fibre feature be that length-to-diameter ratio is large, specific tenacity is high, specific surface area is large, density is low and biodegradable, have that cost is low, tensile strength advantages of higher in addition, replace timber to make cementitious composite batten strongthener, in use unharmful substance and obnoxious flavour generate.

But the alkaline attack effect of vegetable fibre extract to the anticoagulation of cement and cement-hydrate all limits the application of plant fiber-cement composite strip plate, show: the high alkalinity liquid phase in cement matrix hole has erosion action to vegetable fibre, thus affects the weather resistance of composite strip plate; Vegetable fibre has very high water-intake rate, the declining to a great extent of flexural tensile strength and Young's modulus after volume change can be caused to cause plant fiber-cement composite strip plate to make moist, and composite strip plate is distorted distortion, even ftractures; Vegetable fibre because there is depolymerization, making its polymerization degree decline and causing the corresponding reduction of its tensile strength under microbial process.For solving the problems of the prior art, need to carry out modification to existing plant fibre surface and reduce the alkalescence of gelling material.

Summary of the invention

Object of the present invention is just to provide excellent plant fiber-cement composite strip plate of a kind of water resistance and preparation method thereof, to overcome the deficiencies in the prior art.

The object of the present invention is achieved like this:

The plant fiber-cement composite strip plate that a kind of water resistance is excellent, it is characterized in that, be made up of the raw material of following weight part: vegetable fibre 26-35, silicate cement 30-35, flyash 35-40, talcum powder 5-8, titanium white slag 15-20, Sodium hexametaphosphate 99 0.2-0.4, chromic oxide 0.4-0.8, sodium sulfate 1-3, turps 5-7, waterborne polyurethane resin 15-17, vinyl-acetic ester 8-12, glycerine 6-9, water are appropriate.

The preparation method of the plant fiber-cement composite strip plate that described a kind of water resistance is excellent, is characterized in that comprising the following steps:

(1) within baking oven about 3-4 hour that vegetable fibre is put into 105 DEG C, dry, room temperature is dried, rap that to remove to pectin and be crushed to diameter be 3-6mm again with skin hammer, being placed on mass concentration is soak 24 hours in the waterborne polyurethane resin of 10%, press dry post-drying, air blast to the state of seething sprays into vaporific turps, dries;

(2) titanium white slag is calcined 1-2 hour at 650-740 DEG C, cooling adds flyash, talcum powder agitation grinding 30-40 minute, add chromic oxide and be warming up to 190-270 DEG C of stirring 5-10 minute, be cooled to 50-80 DEG C, add vinyl-acetic ester, 10-15 minute is stirred in glycerine continuation, be cooled to room temperature, dry porphyrize;

(3) sodium sulfate be dissolved in water and stir 10-15 minute, add step (1), (2) reaction mass stirring and evenly mixing, add silicate cement and other remaining components again and stir 20-30 minute, it is shaping to add forming machine, obtains finished product successively after 20-30h through cutting, the demoulding, natural curing.

The present invention has following beneficial effect: it is easy that the present invention prepares simple operations, first waterborne polyurethane resin dip treating technique is taked to make the surfaces externally and internally of vegetable fibre be enclosed with one layer of polymeric film to plant fibre surface pre-treatment, spray vaporific turps again, make whole fibre dense and obtain certain rigidity, and water tolerance improves; Secondly flyash is added and in addition modification replaces part of cement, the growing amount of calcium hydroxide after minimizing aquation, improve the corrosion resistance of vegetable fibre, choose the water cement ratio of 0.42, obtained plant fiber-cement composite strip plate also has that quality is light, intensity is high, antibacterial and mouldproof, heat preservation and insulation are good and the feature of low-carbon environment-friendly simultaneously.

Embodiment

The plant fiber-cement composite strip plate that described a kind of water resistance is excellent, it is characterized in that, be made up of the raw material of following weight part: vegetable fibre 33, silicate cement 34, flyash 40, talcum powder 8, titanium white slag 16, Sodium hexametaphosphate 99 0.3, chromic oxide 0.7, sodium sulfate 1, turps 5, waterborne polyurethane resin 16, vinyl-acetic ester 10, glycerine 9, water are appropriate.

Making method comprises the following steps:

(1) within baking oven about 3-4 hour that vegetable fibre is put into 105 DEG C, dry, room temperature is dried, rap that to remove to pectin and be crushed to diameter be 3-6mm again with skin hammer, being placed on mass concentration is soak 24 hours in the waterborne polyurethane resin of 10%, press dry post-drying, air blast to the state of seething sprays into vaporific turps, dries;

(2) titanium white slag is calcined 1-2 hour at 650-740 DEG C, cooling adds flyash, talcum powder agitation grinding 30-40 minute, add chromic oxide and be warming up to 190-270 DEG C of stirring 5-10 minute, be cooled to 50-80 DEG C, add vinyl-acetic ester, 10-15 minute is stirred in glycerine continuation, be cooled to room temperature, dry porphyrize;

(3) sodium sulfate be dissolved in water and stir 10-15 minute, add step (1), (2) reaction mass stirring and evenly mixing, add silicate cement and other remaining components again and stir 20-30 minute, it is shaping to add forming machine, obtains finished product successively after 20-30h through cutting, the demoulding, natural curing.

The technical parameter index of the plant fiber-cement composite strip plate using the present invention to produce is as follows:

(1) fracture toughness value improves 62.12%;

(2) relative impact intensity improves 29.94%;

(3) thermal conductivity (medial temperature 25 ± 2 DEG C): 0.072W/ (mk).

Claims (2)

1. the plant fiber-cement composite strip plate that a water resistance is excellent, it is characterized in that, be made up of the raw material of following weight part: vegetable fibre 26-35, silicate cement 30-35, flyash 35-40, talcum powder 5-8, titanium white slag 15-20, Sodium hexametaphosphate 99 0.2-0.4, chromic oxide 0.4-0.8, sodium sulfate 1-3, turps 5-7, waterborne polyurethane resin 15-17, vinyl-acetic ester 8-12, glycerine 6-9, water are appropriate.

2. the making method of the plant fiber-cement composite strip plate that a kind of water resistance according to claim 1 is excellent, is characterized in that comprising the following steps:

(1) within baking oven about 3-4 hour that vegetable fibre is put into 105 DEG C, dry, room temperature is dried, rap that to remove to pectin and be crushed to diameter be 3-6mm again with skin hammer, being placed on mass concentration is soak 24 hours in the waterborne polyurethane resin of 10%, press dry post-drying, air blast to the state of seething sprays into vaporific turps, dries;

(2) titanium white slag is calcined 1-2 hour at 650-740 DEG C, cooling adds flyash, talcum powder agitation grinding 30-40 minute, add chromic oxide and be warming up to 190-270 DEG C of stirring 5-10 minute, be cooled to 50-80 DEG C, add vinyl-acetic ester, 10-15 minute is stirred in glycerine continuation, be cooled to room temperature, dry porphyrize;

(3) sodium sulfate be dissolved in water and stir 10-15 minute, add step (1), (2) reaction mass stirring and evenly mixing, add silicate cement and other remaining components again and stir 20-30 minute, it is shaping to add forming machine, obtains finished product successively after 20-30h through cutting, the demoulding, natural curing.